Jasion Thunder Pro
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Facts
Summary of Reviews
We have read all expert and user reviews on the Jasion Thunder Pro. In summary, this is what cyclists think. Published Jul 09, 2026 by Reda Ashour.
11 reasons to buy
- Jasion's Thunder Pro is available as a step-over or step-through (Thunder Pro ST).
- The Thunder Pro comes with front and rear lights, a brake light, turn signals, a 55lb-capacity rear rack, and fenders.
- Testers reach speeds of around 36mph on the Thunder Pro.
- Testers say throttle response is immediate and acceleration is rapid.
- Reviewers appreciate the smooth power delivery.
- The hydraulic disc brakes demonstrate good stopping power throughout testing.
- Owners can adjust the speed limits of each PAS level through the app.
- A reviewer says assembly is straightforward, and the tools are included.
- Testers enjoy the stable handling.
- Experts say the suspension and fat tires take the edge off bumpy pavement.
- The color display is easy to read in bright sunlight.
10 reasons not to buy
- Two testers, one 6’ and the other 6’2”, are close to the seatpost extension limit, meaning the stated height range (5’5” to 7’2”) is exaggerated.
- An expert says the Thunder Pro struggles on steep inclines.
- Jasion misrepresents or inaccurately states various product specs.
- A 250lb owner and tester complain that, when the shock compresses fully, it hits the seat tube and the saddle hits the rear rack.
- A buyer and reviewer receive bikes that aren’t functional out of the box. Another bike arrives with rust at the weld seams and chipped paint.
- The Thunder Pro is very large and heavy at 78" long and almost 100lb.
- Most testers would prefer a more upright riding position.
- Reviewers complain that pedal assist takes a full revolution to kick in.
- Several test bikes suffer brake rub, clicking derailleurs, and creaky suspension.
- The IPX4 water resistance rating means the Thunder Pro shouldn't be ridden in heavy rain.
Bottom line
The Jasion Thunder Pro is a large and heavy budget fat-tire e-bike that earns praise for its high top speed, which exceeds legal e-bike limits. In testing, the smooth, rapid acceleration impresses, but despite the speed on flat terrain, the bike struggles on steep inclines. The brakes and suspension are deemed to perform well enough for the price point. However, heavier riders may experience the rear shock bottoming, causing the saddle to strike the rear rack. Unfortunately, the Thunder Pro’s low price tag brings serious quality-control concerns, drastically reducing its appeal.Expert Reviews
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