AOTOS FLUX X26 vs X26 Pro: which fat tire electric bike to buy

What the two FLUX bikes share

The FLUX X26 and X26 Pro use the same chassis, so they ride, fit and stop the same way. AOTOS sells them as two separate bikes, and we list them on two pages: the AOTOS FLUX X26 and the AOTOS FLUX X26 Pro. Both share these specs:

• Motor: 750W rated, with a Boost mode that lasts up to 10 seconds at a time and reaches 28 mph.
• Frame: 6061-T6 aluminum with front and rear suspension.
• Brakes: front and rear hydraulic disc brakes.
• Tires: 20 x 4 in fat tires.
• Weight and load: 97 lb (45 kg) net and a 330 lb max load.
• Fit: riders from 5 ft 2 in to 6 ft 7 in, a 33.5 in seat height, a 23.6 in seat length, a 28.5 in handlebar width and a 40.9 in handlebar height.
• Size: 70.5 in long with a 46.9 in wheelbase.
• Everyday features: three ride modes, a 5.5-inch color TFT display, keyless unlock, the AOTOS app, climbing up to 25% and a charge of about 6 hours.

If the shared list covers what you need, the X26 is the simpler buy. The Pro is about power, battery and security, not a different riding position.

Boost power and torque

Both bikes hold 750W rated power in normal riding. The difference shows when you press Boost. The X26 peaks at 1,200W in Boost with 80 Nm of torque. The X26 Pro peaks at 2,000W in Boost with 100 Nm.

Torque is the pulling force you feel when you start from a stop or climb. With 25% more torque and a higher peak, the Pro should feel stronger off the line and on steep grades, especially with a heavier rider or cargo. Both list the same 28 mph top speed in Boost and the same 25% climbing rating, so the extra power shows up as stronger pull, not a higher top speed.

Because both bikes reach 28 mph in Boost and peak above 750W, check how your state and city classify electric bikes before you ride on public roads and paths. Our guide to e-bike classes explains the three-class system most states use.

Battery and range

The battery is the biggest practical difference. The X26 runs a 48V 18Ah battery, which works out to 864 Wh. The X26 Pro runs a 48V 21Ah battery that AOTOS lists at 1008 Wh, about 17% more energy.

AOTOS rates the X26 for up to 50 miles and the X26 Pro for up to 70 miles. The gap in the range ratings is bigger than the gap in battery size, so treat both as best-case maker figures. Real range drops with throttle-only riding, Boost, cold weather, headwinds and a heavy load, and fat tires take more energy than skinny ones. Our guide to electric bike battery range explains how to estimate yours.

Maker figures, checked September 2026. Real range and speed depend on rider weight, terrain, temperature and riding mode.

Both bikes charge in about 6 hours. The X26 Pro also lists IPX6 for the battery and IPX5 for the bike, while the X26 lists IPX5. Neither rating makes a bike safe to submerge or pressure wash, so wipe it down instead. For charging and storage habits that keep the pack healthy, read electric bike battery care.

Security and smart features

The X26 Pro adds the features that matter if you park outside or ride far from home.

• 4G GPS tracking: the Pro reports its location over a cellular connection, which helps if the bike is moved without you. The X26 has an app lock but no GPS tracking.
• Physical lock: the Pro lists a physical lock alongside the app. The X26 lists the app lock.
• Tire pressure monitoring: the Pro watches tire pressure for you. On fat tires, low pressure costs range and grip, so this is a useful extra.
• Navigation on the display: the Pro syncs turn-by-turn navigation to its 5.5-inch color screen. The X26 has the same screen without navigation.
• Under-frame storage bag: included with the Pro, not included with the X26.

GPS tracking helps you find a bike, but it does not stop a thief. Lock either bike to a fixed object with a solid lock. Our guide on how to lock an electric bike covers the method.

Living with a 97 lb fat tire bike

At 97 lb, both FLUX bikes are heavy. That weight comes from the fat tires, the full suspension and the battery, and it is the same on both versions. On flat ground you will not notice it. Up stairs, into an elevator or onto a car rack, you will.

• Storage: measure your space. Both bikes are 70.5 in long.
• Car racks: any rack needs to be rated for the full weight.
• Tires: check fat tire pressure often. A soft fat tire feels slow and drains the battery.
• Service: power off and follow the AOTOS manual for routine care. Send battery, controller, brake and wiring work to a qualified technician, and check our warranty page for covered faults.

If 97 lb is too much for your home, look at a lighter commuter instead. Our guide to fat tire electric bikes compares other fat tire models and their weights.

Price bands and paying over time

The X26 sits in the $1,500 to $2,000 price band, and the X26 Pro in the $2,000 to $2,500 band. For the difference, you get more Boost power and torque, about 17% more battery, a 70 mile range rating, GPS tracking, tire pressure monitoring, navigation and the storage bag.

The X26 qualifies for Pay in 4 at 0% APR, offered on orders of $2,000 or less. The X26 Pro is above that cap, so it is paid over time with monthly plans with Affirm, subject to approval. Monthly plans can carry interest. Both bikes ship free to the lower 48 states, orders placed by 2 PM ET ship in 1 to 2 business days, and both are covered by our 14-day returns policy.

Which FLUX suits you

• Shorter rides, secure indoor parking and the lower price band: the AOTOS FLUX X26.
• Long rides, heavier riders or cargo and steep hills: the X26 Pro, for the bigger battery and stronger Boost.
• Parking outside or worried about theft: the X26 Pro, for 4G GPS tracking and the physical lock.
• You need a light bike: neither. Both are 97 lb, so look at a lighter model.

See every AOTOS model on our AOTOS electric scooters and bikes page, or browse the full electric bike range, where the Segway Myon is another 28 mph option. If you are shopping on a budget, our sibling guide to electric bikes under $2,000 lists more options.

Questions riders ask