Hub Bolt Size to Attach Thule Bike Trailer??

[daves]

Hello, fellow WagonHeads!

I have a 2019 RadWagon and would like to attach my Thule Chariot 2 jogging stroller.  I have ordered a replacement bike adaptor ezHitch cup (https://www.thule.com/en-ca/accessories/axle-mounted-hitch-cup---main-body-_-1662756) for the stroller bike attachment arm to lock into (ball and cup joint). 

However, without a hub adaptor, I do not believe the ezHitch cup will provide enough clearance from the bike frame for the stroller bike attachment arm to connect.

Unfortunately, I do not know the hub bolt thread diameter or thread count to make sure I get a correctly sized hub adaptor.  I came across the adaptors linked below which I believe will do the trick.  I just don't know what size to get - or if there is a better option.

https://www.etrailer.com/question-297308.html

Any assistance would be greatly appreciated.  Thanks so much!

Cheers
Dave

[Mooree]

Attaching a Schwinn bike trailer to a bike is simple as the Schwinn company specifically designed their trailers to be compatible with most bikes. You will likely not need an adapter anymore, making it even more convenient and cost-friendly for most buyers.

[crorris]

I put a Schwinn trailer on my Rover 5. I had to get new nut because the stock one has a lip around it that makes it too large. The axle on my Rover 5 is M12-1.25. The 1.25 is harder to find. Most of the ones I found were M12-1.75 which will not work. Here's the nut I ended up getting.

https://amzn.to/3abspBw


I've head that the bolt all the Rad's are the same size, but I can't confirm that.