2

I purchased the Swytch eBike conversion front wheel but I found that the axle was 11mm in diameter, which was too big for my hybrid bike and any other bike fork I've tried. Could you tell me if there are bikes which take an 11mm front axle or advice on what to do next. Thank you.

3
  • Hi, welcome to the site. We don’t do product recommendations because they go out of date so quickly, so I’ve edited the question to try to make it on-topic. Feel free to edit again as you please and check out the site tour to read about asking great questions. If you can take a photo of your measurement, or of the axle not fitting the fork that could be useful to the question. – Swifty Mar 25 '19 at 6:09
  • "any other bike fork I've tried" - what year and brand, just curious? Mine fit Fuji bicycles with no modification other than wiping out any grease and gunk in the front fork's bottom. – NoBugs Feb 25 at 4:20
  • Similarly disappointed. Received two 2021 kits yesterday and don't fit either of the bikes I bought them for - early noughties Thorn (26") and a 4 year old Raleigh (700cc). The 'instruction videos' are marketing rather than instruction and there is no sizing info on the website and nothing about this problem in the troubleshooting guide. I've had a go at filing the axle down on one, (still nowhere near yet) but I'm reluctant to take a file to forks for the fork washers though have people found this necessary? – Matt Bike Feb 27 at 20:08
2

Presumably you have a bike designed for quick-release wheels that have a 9mm diameter axle.

The Swytch eBike conversion wheel seems to use 10mm solid threaded axles that are secured to the fork with nuts - which makes sense as this provides higher clamping force required to handle the motor torque. (FWIW, this fact seems to be absent from the Swytch website, and it means that their product is not compatible with any bike.)

If your fork dropouts have sufficient material, you may be able to enlarge the dropout width with a file, but beware that you will not be able to use the 9mm axle wheel. It would be dangerous to do so.

You could also find a cheap fork designed for threaded axles. You would need to match your current fork's geometry (headtube to axle distance, rake). As threaded axle hubs are used on cheap bikes you will not find a replacement part available for sale as a separate component. You'll want to get one from a old used bike. A good source for things like this are bike cooperatives or bike stores that specialize in refurbishing old bikes. They often have piles of bikes that are not worth refurbishing or frames that have had parts stripped from them.

4
  • Good thoughts - the risk here is if the motor-wheel doesn't have a torque arm, then the dropouts are the only hard surface transferring power, which could lead to the axle's flat sides chewing out the fork's metal. If the motor is 200W or less, then that's unlikely, 300W perhaps, and 400W+ it gets more probable. – Criggie Mar 25 '19 at 18:13
  • 1
    @Criggie I looked at the Swytch website, their front wheel uses torque washers with a tab that fits in the dropout slot, which means the dropout probably would have be deepened as well as widened. – Argenti Apparatus Mar 25 '19 at 18:33
  • 2
    This all makes the website’s claim of the kit fitting “99% of bicycles” seem a bit of a stretch... – Swifty Mar 26 '19 at 16:39
  • 1
    ^ I agree that could be more clear. Upon trying an old Mtn bike, it was too small, upon contacting Swytch they recommend filing the axle carefully!? but on two of the four bikes I tried to put on, the newer Fuji (2000s era bikes?) had no modification necessary and they are quick-release, fairly modern design. It's not fair to say "not compatible with any bike", just not compatible with everyone's bikes from 1990s. – NoBugs Feb 25 at 4:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.