How Far Can an Electric Bike Go on One Charge? Real-World Range Guide

How Far Can an Electric Bike Go on One Charge?

Most electric bikes achieve between 25 and 60 miles (40 to 95 km) on a single charge under mixed real-world conditions. However, actual range can span anywhere from 15 miles on high-throttle setups to 100+ miles on dual-battery touring systems.

Expected Range by Battery Size and Riding Mode

Ebike energy consumption typically averages 15 to 25 watt-hours (Wh) per mile. Battery capacity is the main baseline:

Battery Capacity (Wh) = Volts (V) × Amp-hours (Ah)

Key Factors Affecting Real-World Range

• Motor Assist & Throttle Use: Relying heavily on a thumb or twist throttle drains capacity at over double the rate of pedaling with low-level assistance.
• Speed & Aerodynamic Drag: Air resistance increases rapidly with speed. Cruising at 28 mph (Class 3 top speed) consumes significantly more Wh per mile than cruising at 15–18 mph.
• Payload & Elevation: Riding uphill forces the motor to draw peak wattage. Combined rider and cargo weight also increases rolling resistance.
• Tire Pressure & Tread: Underinflated tires or wide, aggressive knobby fat tires (4.0") increase friction compared with high-pressure slick commuter tires.
• Ambient Temperature: Lithium-ion cell efficiency drops noticeably below 40°F (4°C), which can reduce total usable range by 15–25%.

How Does Battery Capacity (Wh) Affect an E-Bike's Range?

Battery capacity, measured in watt-hours (Wh), represents the total amount of energy stored in an e-bike's battery—essentially the size of its "fuel tank."

It has a direct, proportional relationship with range: assuming all other riding conditions remain constant, doubling the battery capacity (Wh) doubles the available range.

1. The Core Relationship: Energy vs. Efficiency

An e-bike's range is fundamentally determined by this formula:

Estimated Range (miles or km) = Battery Capacity (Wh) ÷ Energy Consumption Rate (Wh/mile or Wh/km)

• Watt-hours (Wh): Calculated as:

   

  Battery Capacity (Wh) = Voltage (V) × Amp-hours (Ah)

  For example, a 48V 14Ah battery provides:

  48 × 14 = 672 Wh

• Consumption Rate (Wh/mile): The average amount of electricity consumed per unit of distance.

2. General Consumption Benchmarks

Real-world energy draw typically varies depending on pedal assist levels and terrain:

3. Factors That Alter How Far Each Wh Takes You

While Wh sets the theoretical limit, the actual efficiency depends on multiple external and mechanical factors:

• Speed and Aerodynamic Drag: Air resistance increases quadratically with speed. Cruising at 28 mph (Class 3) can require more than twice the Wh/mile of cruising at 15–18 mph.
• Assist Mode & Rider Input: Relying entirely on a throttle draws maximum power continuously, while riding in low pedal assist uses human power to offset battery drain significantly.
• Terrain & Elevation: Climbing hills requires high motor torque and sustained power draw, drastically cutting the effective range compared with flat pavement.
• Tire Type & Rolling Resistance: Fat tires (e.g., 4.0-inch) run at lower PSI and create substantially more rolling drag than narrow commuter or road tires.
• Total Payload: The combined weight of the rider, bike, and cargo dictates how much work the motor must do, especially during stop-and-go acceleration.
• Temperature & Battery Health: Lithium-ion cells experience higher internal resistance in cold weather (below 40°F / 5°C), temporarily reducing usable Wh capacity by 15–30%.

Summary Rule of Thumb

When sizing or comparing e-bike batteries:

• ~400–500 Wh: Good for light commuting and casual riding (approx. 20–45 real-world miles).
• ~600–750 Wh: Standard for all-around commuters, trail bikes, and heavier fat-tire bikes (approx. 30–60 real-world miles).
• ~900–1,200+ Wh (or dual-battery systems): Suited for heavy cargo, long-distance touring, or high-speed Class 3 throttle riding (approx. 45–90+ real-world miles).

Does Rider Weight or Carrying Cargo Significantly Reduce the Distance?

Yes, additional rider weight or cargo reduces an e-bike's range, but the extent depends heavily on terrain and riding style rather than steady flat cruising alone.

As a general benchmark, adding 50 lbs (approx. 23 kg) of extra payload typically cuts battery range by 10% to 25% under mixed real-world conditions.

Where Weight Has the Highest Impact

• Climbing Inclines: Lifting extra mass against gravity requires direct mechanical work:

   

  W = m × g × h

  On continuous 4% to 8% grades, a heavy payload forces the motor to draw maximum sustained wattage (often 500W–1000W+), which can slash total range by 40% or more.

• Stop-and-Go Urban Riding: Overcoming inertia to accelerate from a dead stop requires force:

   

  F = m × a

  Heavy cargo in city traffic drains the battery substantially faster than cruising continuously on an open road.

• Tire Rolling Resistance: Increased weight deforms tire sidewalls and widens the contact patch. If tire pressure isn't increased to accommodate the extra load, rolling drag increases substantially—especially on wide 4.0" fat tires.

Where Weight Matters Less

• Flat, Constant-Speed Cruising: Once up to speed on flat pavement (above 15–20 mph), aerodynamic drag accounts for 70% to 80% of total resistance. A heavier rider who maintains a tucked, compact posture will often achieve better range than a lighter rider sitting bolt upright with bulky, wind-catching panniers.

Payload vs. Estimated Range Impact

Best Practices to Maximize Range Under Heavy Load

1. Top off tire pressure: Inflate tires near the higher end of the recommended PSI on the sidewall to reduce tire deflection and rolling friction under heavy load.
2. Shift into lower mechanical gears when accelerating: Do not rely solely on the throttle or high pedal assist to start moving. Shifting down reduces motor strain and voltage sag from a standstill.
3. Streamline cargo: Keep cargo low, centered, and narrow. Panniers that flare out wide catch substantial crosswinds and head-on drag at cruising speed.

How Much Does Using the Throttle Instead of Pedal Assist Impact the Battery?

Using the throttle instead of pedal assist (PAS) typically reduces your total range by 40% to 60% under standard riding conditions.

In real-world riding, a battery capable of delivering 40 to 60 miles on low-to-moderate pedal assist will often drop to 18 to 28 miles when relying solely on the throttle.

Direct Impact Comparison

Why Throttle Drains the Battery Faster

• Zero Human Work Sharing: With pedal assist, your legs provide 50 to 150 watts of continuous mechanical power. When using the throttle, the motor must supply 100% of the kinetic energy needed to overcome rolling resistance and aerodynamic drag.
• Dead-Stop Acceleration Spikes: Electric hub motors are least efficient at low RPMs. Twisting the throttle from a complete stop causes current draw to spike to the controller's maximum limit (often 18A to 25A, or 800W–1200W peak), dumping large amounts of energy into heat rather than forward motion.
• Aerodynamic Drag Penalty: Throttle use tends to maintain higher average speeds (18–20 mph). Because wind resistance increases rapidly with speed:

   

  Power required for aerodynamic drag ∝ Speed³

  Pushing through air at 20 mph requires roughly twice the power needed at 14 mph.

• Voltage Sag & Peukert Effect: Sustained heavy discharge rates cause temporary voltage drop under load. Drawing high amperage generates internal cell resistance and heat, reducing the usable watt-hours (Wh) extracted from the pack during that cycle.

How to Minimize Throttle Drain

• Pedal to start: Give 2 to 3 pedal strokes to get the bike rolling to 5 mph before engaging the throttle to bypass the peak current spike.
• Ease in: Feather the throttle rather than pegging it wide open against the stop.
• Downshift on inclines: If you have a mid-drive motor, shift into a lower mechanical gear before throttling uphill so the motor can spin in its optimal efficiency band.

How Much Does Riding Uphill or in Strong Headwinds Decrease Range?

Riding uphill or fighting a strong headwind typically reduces an electric bike's real-world range by 30% to over 60%, and in severe conditions (steep continuous climbing into a headwind), range can drop by up to 75%.

Range Impact Overview

The Physics: Why the Drain Is So High

1. Strong Headwinds (Aerodynamic Drag)

Aerodynamic drag is governed by the relative airspeed of the rider, not just the ground speed.

• The drag equation: Power required to overcome air resistance can be expressed as:

   

  P_drag = 0.5 × ρ × Cd × A × v_ground × v_rel²

• The compounding effect: If you ride at 18 mph into a 17 mph direct headwind, your effective airspeed is 35 mph. Overcoming air resistance at 35 mph requires roughly 7 to 8 times more power than riding at 18 mph in calm air.
• Upright posture: Commuter and fat-tire e-bikes present large frontal surface areas (A), amplifying the wind penalty compared with drop-bar or tucked positions.

2. Uphill Riding (Gravitational Work)

Climbing forces the motor to continuously lift your total system weight (rider + bike + cargo).

• Constant work against gravity:

   

  W = m × g × h

  Lifting a 200 lb (90 kg) combined weight up a 1,000 ft (305 m) vertical elevation gain demands roughly 75 watt-hours (Wh) of pure mechanical work, not counting motor heat losses or rolling resistance.

• Controller and motor thermal losses: When tackling steep grades at lower speeds, hub motors operate well below their optimal RPM efficiency band, causing a larger percentage of battery power to dissipate as heat rather than forward motion. Mid-drive motors fare better if shifted into a low gear, but total energy demand remains high.

How to Preserve Range in These Conditions

• Drop pedal-assist levels (PAS): Lowering assist from Turbo/Sport to Eco/Tour forces your legs to absorb more of the base mechanical load, keeping motor current (A) out of peak draw zones.
• Downshift early (especially on mid-drives): Maintain a cadence of 70–90 RPM. Keeping motor and crank RPM high prevents mid-drive motors from bogging down and pulling peak continuous amperage.
• Adopt a lower profile in headwinds: Lower your chest slightly, bend your elbows, and tuck in loose jackets. Lowering frontal area by 20% directly cuts drag by roughly the same margin.
• Moderate your ground speed: Into a 20 mph headwind, dropping cruising speed from 20 mph to 14 mph cuts total air resistance nearly in half.

Does Cold Weather or Winter Riding Make the Battery Drain Faster?

Yes. Riding an electric bike in cold or winter weather causes the battery to drain noticeably faster, typically reducing total range by 20% to 40% at temperatures around or below freezing (32°F / 0°C).

The drop in performance comes from two main factors: electrochemical slowdown inside the battery pack and increased physical resistance on the road.

Why Cold Drains the Battery Faster

• Higher Internal Resistance: Lithium-ion cells rely on liquid or gel electrolytes for lithium ions to move between the cathode and anode. In cold temperatures, this fluid becomes more viscous, slowing ion movement and drastically increasing internal resistance.
• Voltage Sag: Under load (accelerating or hill climbing), higher internal resistance creates a temporary drop in output voltage ("voltage sag"). The battery management system (BMS) interprets this lower voltage as lower remaining capacity, triggering low-battery cutoffs earlier than in warm weather.
• Increased Rolling and Aerodynamic Drag: Cold air is denser, requiring more motor output to maintain cruising speed. Concurrently, cold temperatures decrease tire pressure, stiffen tire rubber, and thicken grease inside wheel bearings and bottom brackets, raising mechanical resistance.

Winter Range Expectations

Best Practices to Maximize Winter Range and Protect the Pack

1. Store and Charge at Room Temperature: Keep the battery inside at room temperature (50°F–70°F / 10°C–21°C) when not in use. Bring the battery inside immediately after finishing a cold ride.
2. Never Charge Below Freezing (32°F / 0°C): Discharging a cold battery is generally safe (though inefficient), but charging a frozen lithium-ion pack causes lithium plating on the anode. This permanently damages battery capacity and creates a major internal short-circuit fire hazard. Always let the battery warm up indoors for 1–2 hours before plugging it into the charger.
3. Mount the Battery Right Before Riding: If you store the bike in an unheated garage or shed, keep the battery indoors and install it on the frame just before heading out. Once active, the current draw generates minor internal heat that helps maintain an operating temperature.
4. Use a Neoprene Thermal Cover: A neoprene sleeve wrapped around an external or integrated down-tube battery slows wind chill and helps retain heat generated by the cells while riding.
5. Adjust Riding Dynamics: Rely on lower pedal-assist levels (PAS 1–2) instead of full throttle. Gradual acceleration reduces severe voltage sag, preventing premature BMS shutdowns.
6. Check Tire Pressure Frequently: Air pressure drops approximately 1–2 PSI for every 10°F drop in temperature. Regularly top off tires to recommended pressures to minimize rolling resistance.

Himiway D5 2.0 20": A Long-Range Choice for Tougher Rides

If range is one of your biggest concerns when choosing an e-bike, the Himiway D5 2.0 20" offers a strong balance of battery efficiency, power, comfort, and carrying capacity. Its 48V 15Ah battery provides up to 70 miles of pedal-assist range, making it well suited for longer commutes, weekend adventures, and riders who do not want to recharge after every short trip.

The bike pairs its battery with a 750W motor delivering 90Nm of torque, giving it the power needed for hills, loose surfaces, and heavier loads. Its 20 × 4.0-inch fat tires and full-suspension design also make it a practical option for riders searching for the best off road ebike for mixed pavement, gravel, dirt roads, and recreational trails.

Another major advantage is its 440 lb payload capacity. For larger riders or anyone carrying groceries, camping equipment, or other cargo, this makes the D5 2.0 20" a compelling heavy duty electric bike without requiring an oversized frame. Its compact 20-inch design accommodates riders from 4'11" to 6'3", combining high load capacity with easier handling and accessibility.

For buyers who prioritize long range, high payload capacity, fat-tire traction, and strong hill-climbing power, the Himiway D5 2.0 20" is a versatile choice for both everyday riding and more demanding adventures.

What Tire Pressure and Tread Type Are Best for Maximizing Mileage?

To maximize e-bike battery range and mileage per charge, the goal is to minimize rolling resistance and rotational mass while maintaining adequate traction.

1. Optimal Tread Type: Slick or Semi-Slick

Knobby tires squirm and flex under load, converting motor energy into heat and vibration rather than forward motion.

• Best Choice (Full Slick or Grooved Slick): Smooth center profiles (e.g., Schwalbe Big Ben, Continental Contact Urban) produce the lowest rolling resistance on paved asphalt and concrete. Shallow water-channeling sipes offer wet grip without adding friction.
• Secondary Choice (Semi-Slick / File Tread): A smooth, continuous center ridge with low-profile shoulder knobs. Ideal if routes include packed gravel or light dirt, providing low rolling resistance in a straight line while preserving cornering bite.
• Avoid: Deep, aggressive knobby tires (MTB or aggressive fat-tire treads), which can reduce total per-charge range by 10% to 25% compared with slick road alternatives.

2. Optimal Tire Pressure: High Within the Safe Envelope

Higher tire pressure reduces tire casing deformation (hysteresis) as the wheel rolls, flattening the contact patch and significantly cutting motor drag.

• Target: Inflate to 85%–95% of the tire sidewall's stated maximum PSI rating.
• Typical Targets by Tire Width:

Note on Fat Tires: Fat tire e-bikes often ship with guidance for 5–15 PSI for snow or soft sand. For paved commuting, pumping them up to 20–25 PSI drastically cuts rolling drag and unlocks noticeable range gains.

3. Practical Trade-offs & Efficiency Tips

• Pavement Quality vs. Over-Inflation: Pumping tires to the absolute rock-hard maximum works best on track-smooth asphalt. On rough chip-seal or cracked roads, an overly stiff tire bounces upward over micro-imperfections, which wastes kinetic energy and degrades braking grip. If routes are bumpy, aim for ~85% of max rather than 100%.
• Rider & Cargo Weight: The heavier the total payload (rider + cargo + e-bike), the closer you should run toward the upper PSI limit to stop the tire casing from collapsing under load. Check rear tires more frequently, as they support roughly 60%–70% of total system weight on most hub-drive and commuter setups.
• Weekly Pressure Checks: High pressures drop naturally via micro-permeation. A drop of just 5–10 PSI increases rolling drag noticeably before the tire even looks low. Inspect pressure every 7–10 days with a digital gauge.

How Many Years or Charge Cycles Will an E-Bike Battery Last Before It Needs Replacing?

A quality lithium-ion e-bike battery typically lasts 3 to 5 years (or up to 6–7 years with meticulous care) and delivers between 500 and 1,000 full charge cycles before noticeable degradation.

What "End of Life" Actually Means

Reaching the rated cycle count does not mean the battery abruptly dies. Instead, the industry defines the standard replacement threshold as reaching roughly 70% to 80% of original capacity:

• Full Charge Cycle Definition: One cycle represents using 100% of the total capacity. Discharging from 100% to 50% twice equals one full cycle.
• Real-World Mileage: For a typical 48V/14Ah–20Ah battery offering 30–50 miles per full charge, 500 to 800 cycles translates to approximately 15,000 to 25,000 miles (24,000 to 40,000 km) of riding before range drops significantly.

Typical Lifespan by Cell Quality

Key Signs It Needs Replacement

1. Severe Range Loss: The pack covers less than 60–70% of its initial distance on the same routes and assist levels.
2. Voltage Sag Under Load: The motor cuts out or the display resets during high-amp draws (e.g., steep climbs or full throttle), even when the display indicates 30–40% charge.
3. Incomplete or Prolonged Charging: The charger never triggers the green completion light, charges unusually slowly, or the Battery Management System (BMS) fails to balance individual cell banks.
4. Physical Symptoms: Any casing swelling, burning smell, or excessive heat during charging requires immediate decommissioning.

Best Practices to Maximize Lifespan

• Avoid Deep Discharges: Recharge before dropping below 20%.
• Avoid Sitting at 100%: Do not leave the battery plugged into the charger at maximum voltage for weeks at a time.
• Off-Season Storage: Store indoors at roughly 40%–60% state of charge in a cool, dry area (15°C–20°C / 59°F–68°F).
• Temperature Protection: Never charge a battery that is below freezing (0°C / 32°F), as this causes lithium plating and irreversible cell damage.

Does the Total Range per Charge Decrease as the Battery Gets Older?

Yes, total range per charge naturally decreases as an e-bike battery ages.

This happens because the lithium-ion cells inside undergo irreversible physical and chemical changes over time. An aging battery still charges up to "100%" on the display, but that 100% represents a smaller pool of usable energy (watt-hours) than when it was new.

Why Range Declines

1. Loss of Usable Capacity: Standard e-bike lithium-ion packs typically last 500 to 1,000 full charge cycles (roughly 3 to 5 years of regular use) before dropping to around 70%–80% of their original capacity. A bike that originally achieved 50 miles per charge will typically yield closer to 35–40 miles at this stage.
2. Increased Internal Resistance: As the electrolyte degrades and protective layers (SEI) thicken on the electrodes, the battery's internal resistance rises. This causes voltage sag under high load (such as accelerating or climbing hills), prompting the controller or Battery Management System (BMS) to cut assist earlier to prevent under-voltage.
3. Calendar Aging: Even if the bike is rarely ridden, the chemistry inside the cells slowly degrades over time, especially if stored in high ambient temperatures or left at extreme charge levels (0% or 100%).

What to Expect Over Time

How to Slow Down the Loss of Range

• Avoid deep discharges: Try not to run the battery down to 0%. Recharging around the 20% mark significantly extends cycle life.
• Avoid prolonged 100% storage: If you are not riding for a few weeks or over the winter, store the battery at 50%–70% charge in a cool, dry place (around 15°C–20°C / 59°F–68°F) rather than leaving it on the charger.
• Manage heat: Avoid leaving the battery in direct sunlight or a hot car trunk, and let it cool down after a ride before plugging it in.

What Are the Best Tips or Habits to Extend an E-Bike's Range on a Single Charge?

Maximizing e-bike range comes down to minimizing mechanical resistance, optimizing motor draw, and managing energy storage efficiency.

1. Optimize Assist & Gearing

• Downshift before stopping: Accelerating from a standstill in a high gear forces the motor into maximum torque mode, causing massive battery voltage sag and current draw. Shifting into an easy gear before a red light lets human cadence share the startup load.
• Maintain an optimal pedaling cadence (70–90 RPM): Electric bike motors (especially mid-drives, but also geared hub motors) operate most efficiently within this RPM window. Mashing heavy gears at low RPMs (below 50 RPM) wastes substantial power as heat.
• Rely on lower PAS levels: Cruise on Pedal Assist Level 1 or 2 on flat terrain. Reserve top assist or full throttle for steep inclines or headwinds. Throttle-only riding typically cuts total range by 30% to 50% compared with moderate pedal assist.
• Keep momentum: Coast early before turns or upcoming stops rather than hard braking. Every hard brake discards kinetic energy that the battery must expend watt-hours to rebuild.

2. Mechanical Maintenance & Setup

• Run correct tire pressures: Low PSI creates excessive rolling resistance. For standard commuter tires, run near the recommended max sidewall PSI. For 4-inch fat tires, bumping pressure from 12–15 PSI to 20–22 PSI on tarmac can reduce energy expenditure by 15% or more.
• Keep the drivetrain clean and lubricated: A dry, grimy chain and gunked derailleur pulleys add drivetrain friction across thousands of pedal revolutions.
• Inspect for brake rotor drag: Lift each wheel and spin it by hand. If a disc brake pad rubs continuously against the rotor, it acts as a constant parasitic draw on the motor. Center the calipers if you hear rubbing.

3. Aerodynamics & Weight

• Manage speed ceilings: Aerodynamic drag is non-linear—air resistance scales with the square of speed, meaning cruising at 20 mph requires roughly double the aerodynamic power of riding at 14 mph. Dropping cruising speed by just 3–4 mph yields a noticeable jump in mileage.
• Tuck against headwinds: Riding in a more upright posture acts like a parachute in strong gusts. Lowering elbows or shifting hand position forward noticeably reduces aerodynamic load.
• Trim unnecessary payload: Remove heavy cargo, locks, or oversized panniers when not in use. Extra weight adds mechanical rolling resistance and increases energy requirements on every incline.

4. Thermal & Battery Health Management

• Avoid cold-start riding: Lithium-ion cells experience increased internal resistance at temperatures below 10°C (50°F), temporarily reducing usable capacity by 15% to 30%. Always charge and store the battery inside at room temperature (~20°C / 68°F) and only mount it right before riding.
• Avoid running cells down to 0%: Modern BMS units cut off before complete destruction, but deep discharges accelerate cell degradation. Recharging around 20%–30% preserves internal cell health and prevents severe capacity loss over the pack's lifecycle.

How Accurate Are Manufacturer Range Estimates in Real-World Conditions?

In everyday riding, expect to get 50% to 75% of the advertised maximum range. A bike marketed with "up to 50 miles" will realistically deliver 25 to 38 miles in mixed commuter conditions. If you rely heavily on the throttle, cruise at top assist speeds, or tackle hills, that figure can drop closer to 40% to 50% (20–25 miles).

The phrase "up to" represents a best-case laboratory scenario, not an average ride.

How Manufacturers Get Those Numbers

Manufacturers test range under strictly optimized conditions designed to maximize efficiency:

• Pedal Assist Level 1 (Eco Mode): The motor supplies minimal output (usually 10%–25%), leaving most of the work to rider pedaling.
• Rider Weight: Tested with a lightweight rider, typically 140–165 lbs (65–75 kg).
• Terrain & Wind: Perfectly flat, smooth tarmac with zero wind resistance.
• Speed: Cruising at slow, highly efficient speeds (around 10–12 mph).
• Throttle: Throttle is completely disengaged.

Real-World Range by Riding Style (Claimed: 50 Miles)

The Real Benchmark: Calculate Your Watt-Hours (Wh)

Instead of relying on marketing copy, calculate the actual size of the "fuel tank." Multiply battery voltage (V) by amp-hours (Ah):

Capacity (Wh) = Voltage (V) × Amp-Hours (Ah)

For example:

48V × 14Ah = 672Wh

In the real world, consumption rates break down roughly as follows:

• 12–15 Wh/mile: Gentle pedaling, flat terrain, low assist (PAS 1–2).
• 18–22 Wh/mile: Standard commuter pace (18–20 mph, PAS 3, occasional gentle climbs).
• 25–35+ Wh/mile: Throttle-only, fat-tire models, high speeds (Class 3 / 25–28 mph), or steep elevation.

Formula:

Estimated Range = Battery Capacity (Wh) ÷ Energy Consumption (Wh/mile)

Divide your battery's total Wh by 20 to find a dependable, conservative baseline for daily mixed commuting. A 500Wh battery realistically yields around 25 miles, regardless of claims promising 50+ miles.

Key Factors That Cut Range

1. Speed & Aerodynamics: Air resistance increases quadratically with speed. Cruising at 24 mph drains roughly double the energy per mile compared with cruising at 14 mph.
2. Elevation & Payload: Carrying gear or weighing over 200 lbs significantly increases draw during startup and climbs.
3. Cold Temperatures: Lithium-ion cells lose temporary capacity in cold weather; temperatures below 40°F (5°C) can reduce total range by 15% to 25%.
4. Tire Type & Pressure: Fat tires (4.0") and knobby treads exhibit far higher rolling resistance than commuter tires, especially if run under-inflated.