Jasion RetroVolt Pro

Both bikes share the retro moped silhouette: a long flat bench, a caged round headlight, high-rise bars and 20 x 4.0 fat tires. The differences are in the parts you cannot see in the photo. Our RetroVolt 330 review covers that bike in full; here is the comparison that matters if you are choosing between them.

• Battery. Pro: 52 V 20 Ah = 1,040 Wh. 330 on Amazon: 48 V 15 Ah = 720 Wh. That is 44% more stored energy, worth about 13 extra miles at a realistic 25 Wh per mile.
• Brakes. Pro: dual hydraulic discs with 180 mm rotors (Gear Diary). Hydraulic brakes need less hand force and stay consistent in the wet, which matters on a heavy bike that can reach 38 mph.
• Suspension. Pro: a hydraulic front fork with 65 mm of travel and preload adjustment, and a Horst-link rear suspension, a linkage design that keeps the rear wheel tracking the ground better than a simple swingarm.
• Speed and power. Pro: 38 mph, 2000 W peak per Jasion (3000 W per most Amazon listings). 330: 30 mph on the listing, with Jasion's 2026 manual stating 28 mph and 750 W rated, a figure the Pro's sources never give.
• Price. $899.99 (as of Nov 15, 7:10 AM EST, subject to change) against $669.99 (as of Nov 15, 7:10 AM EST, subject to change).

If you will ride at 20 mph on paths and roads, the 330 is the better buy: it is cheaper and Jasion documents a 750 W rated motor. The Pro earns its price only if you will use the bigger battery and the hydraulic brakes, which are the two upgrades with a safety and range case behind them.

Jasion's store says the RetroVolt Pro reaches 38 mph with pedal assist and goes from 0 to 30 mph in about 5 seconds. Every Amazon listing repeats the 38 mph figure, and Gear Diary's reviewer wrote that it reached its top speed easily on level roads. We have not measured it. For context: 20 mph is the ceiling for Class 1 and Class 2 e-bikes, 28 mph for Class 3, and 38 mph is the territory of 50 cc mopeds.

Not as an e-bike, at the speed Jasion sells it. The US three-class system covers bikes whose motors stop helping at 20 mph (Classes 1 and 2) or 28 mph (Class 3, usually without a throttle), with a motor of 750 W rated or less everywhere but Oregon. The federal consumer-product definition at 15 U.S.C. § 2085 sets the line at a motor under 750 W and under 20 mph on motor power alone. The RetroVolt Pro has a twist throttle and a 38 mph top speed, and none of Jasion's pages or the Amazon listings gives a rated wattage. Walmart's listing title says "750W Motor", but Jasion itself publishes only the peak.

Jasion's own guide to the question says "most places allow higher-speed and throttle-equipped bikes on regular roads". We read the state codes differently. In most states a two-wheeler that exceeds the e-bike definition is a moped or motor-driven cycle, which can mean registration, a license or permit, insurance and a helmet. In California, a bike that can exceed 28 mph falls outside Vehicle Code §312.5 and needs registration and an M1 or M2 license. Check your state on our street-legal-by-state guide and read the class explainer before you buy. Jasion's display settings may let you lower the top speed; if your state's rules matter to you, ask Jasion in writing how to set a 20 or 28 mph cap and whether it can be locked.

Jasion's store claims up to 75 miles; the Amazon listings and Gear Diary say 90 miles in pedal-assist mode. The battery is 52 V x 20 Ah = 1,040 Wh. A heavy moped-style fat bike uses roughly 20-30 Wh per mile at legal speeds and more when ridden hard on the throttle. The arithmetic:

• 1,040 Wh / 90 miles = 11.6 Wh per mile, which only a light rider in the lowest assist level on flat ground will see.
• 1,040 Wh / 75 miles = 13.9 Wh per mile, still optimistic for an 82 lb bike on 4-inch tires.
• 1,040 Wh / 25 Wh per mile = 42 miles, our planning figure for mixed assisted riding.
• 1,040 Wh / 40 Wh per mile = 26 miles, a fair guess for sustained throttle riding near the top speed.

That is still a big step up from the RetroVolt 330, whose 720 Wh pack works out to about 29 miles on the same 25 Wh per mile. The Amazon listing says a full charge takes 5 hours. Our guide to how far an e-bike can go explains what moves these numbers.

One Amazon listing (B0GLYKKKWL) has "UL Certified" in its title and Walmart's title says "UL2849", but neither Jasion's RetroVolt Pro page nor the Amazon bullets name the standard, the testing lab or a certificate number. Jasion does state UL 2271 batteries and a UL 2849 electrical system for its dual-battery RetroVolt Max, so the company tests some of its bikes; we could not find the same statement for the Pro. UL 2849 certifies a complete e-bike electrical system and UL 2271 the battery pack, and either can be looked up in the certifier's public directory. If your building requires one of them before you charge indoors, ask Jasion for the certificate and the lab's name in writing. Our battery fire safety guide covers the charging habits that matter whatever the label says.

Jasion does not list an ignition key, NFC card or app lock for the RetroVolt Pro, and Gear Diary named the lack of Jasion app integration as one of its two complaints. The battery is removable and, per Gear Diary, locks into the frame. If keyless start or GPS tracking matters to you, add a good lock and consider a hidden tracker; a fast, 82 lb moped-style bike is a target.

The frame is carbon steel, per the listings, which is why the bike weighs about 82 lb (Gear Diary) and arrives in a box over 100 lb. Plan on a ground-floor garage, not stairs. The payload is 330 lb for rider and cargo. Gear Diary lists a 600-lumen headlight with a brush guard, a rear brake light with built-in turn signals (which also show on the display), a color screen with speed in mph or km/h, pedal-assist levels 0 to 5 (Jasion), a twist throttle and cruise mode, and a seven-speed drivetrain. The perforated rack behind the bench takes cargo; Gear Diary's other complaint was that Jasion does not sell the clips that fit it. The listings say the bike arrives 90% pre-installed.

Jasion is one of the biggest e-bike sellers on Amazon US. In November 2026 its plain EB5 was #1 in Amazon's Electric Mountain Bikes with about 2,300 ratings at 4.1 stars, and the RetroVolt family led Electric City Bikes. That is evidence of volume and broadly satisfied buyers, not of build quality on any one model. The pattern across Jasion's catalogue, which we have reviewed bike by bike, is generous hardware for the price paired with thin paperwork: peak wattage instead of rated, speed claims past Class 3, and UL claims that name no lab. The RetroVolt Pro fits that pattern. Our reviews of the EB5, EB5 MAX, Thunder and RetroVolt 330 show where each one lands.

Other big-battery moped-style bikes we have reviewed:

• The Jasion RetroVolt 330 ($669.99 as of Nov 15, 7:10 AM EST, subject to change): the same look with a 720 Wh pack, mechanical brakes and a 750 W rated motor in Jasion's manual. The sensible buy for most riders.
• The ASKGO GT50 ($559.99 as of Nov 15, 7:10 AM EST, subject to change): a bigger 1,200 Wh battery and a 36 mph claim, with the same legal problem as the Pro.
• The FLIWIN Fat 20 ($498 as of Nov 15, 7:10 AM EST, subject to change): 960 Wh and real rear suspension for far less money, shipped at 20 mph with an advertised unlock to 34 mph, and mechanical brakes.
• The ESKUTE V300 ($369.99 as of Nov 15, 7:10 AM EST, subject to change): a 998 Wh moped-style 20 x 4 bike at a budget price.

Our moped-style e-bike guide ranks the wider field.

Buy the RetroVolt Pro if you want the moped look with the biggest battery and the best brakes Jasion sells on a single pack, you will ride on private land or register it where your state requires, and an 82 lb bike suits where you store it. Skip it if you need a bike that is legal on bike lanes and paths as sold, if you must carry it up stairs, or if you want a documented rated motor and a named UL certificate. In those cases the RetroVolt 330 costs less and answers more of the paperwork questions.