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Wheel Hub dimensions

Posted: Wed Mar 04, 2020 11:23 am
by JimCrawford
I've been making up some wheel hubs to be able to change my Nipper from the 3 1/2 x 4.95 tyres (made from unobtainium) to easily obtained and much, much cheaper 4.00 x 4 (even from Tost!). However I've come across an interesting issue regarding the hub sizes which I hope the forum may be able to solve:
The optional, original manufacture, Nipper 4.00 x 4 hub is 75mm between the side plates at the point where the tyre sits in the hub. That is an internal measurement between the side plates. However I have measured the same dimension on a Tost hub and it is much narrower at 45mm.
I have emailed Tost asking them about the recommended mounting width for their tyres and had no response so I am asking the forum if anybody knows the factors which determine the tyre mounting width. I'm inclined to go for 45mm as that's what I've measured on a Tost hub with a Tost tyre as used on my glider.

Regards

Jim

Re: Wheel Hub dimensions

Posted: Wed Apr 01, 2020 3:55 pm
by G-ARBG
Jim,
I've been using Toste 400x 4 tyres on Slingsby 4 inch wheels until recently. At 75mm the wheels fit the standard Nipper axle and the Toste tyres also fit and have performed quite satisfactorily. Had I ordered new Toste wheels I would have given the the dimensions I required 75mm and the type of bearing.

R.
G-ARBG