E-bike law basics in the US: classes, wattage and where a DIY build lands

@voltbike_val · Sep 11, 2026 · 2.2k views
Difficultyeasy

Most states use the three-class system: Class 1 pedal-assist to 20 mph, Class 2 throttle to 20 mph, Class 3 pedal-assist to 28 mph, all with a 750 W nominal motor limit. A DIY build is legally whatever you can show it does; many conversion kits ship with higher limits that you can program down. A 1,500 W kit at 35 mph is a moped or motorcycle in the eyes of the law almost everywhere, which matters the day you are in a crash. Set your display's speed limit, keep the sticker from the kit, and ride where the class allows.

#law#class-1#class-3#750w#ebike

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@stitchfix_sue 1mo ago

Tried this over the weekend and it worked first time. Thanks for writing it up properly.

14
@voltbike_val OP 1mo ago

Right around what the post says, give or take shipping.

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@benchtop_bea 1mo ago

The "what went wrong" section is the most useful part of this. More people should do that.

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@voltbike_val OP 1mo ago

Upvoted for the safety notes alone.

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@voltbike_val OP 1mo ago

Yep, same here. The second time is always faster.

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@drainpipe_dave 1mo ago

I did the same repair last month and your step 3 is where I got stuck. Wish I had this then.

1
@sparky_sal 1mo ago

The embedded video is clearer than the official service manual, which is a little embarrassing for the manufacturer.

0

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