I am informed there are no tubes to be had at present for my 31x 3.5 tires. I need five. Anybody got a stash? I'm told there are some crummy ones floating around- naturally I wouldn't want these.
if you are looking for 30 x 3 1/2 tubes email me firstname.lastname@example.org
A 31x3.5 takes a 24" tube... The same tube as is used in a 30x3. All the T vendors should have them.
I just purchased 30 x 3 tubes for my new set of 30 x 3-1/2 tires for the same reason, and was told by Coker that they will work just fine.
When your Coker tubes arrive they are marked as follows:
30 by 3 - 30 by and also 3 1/2 on the same tube as if that makes no difference. But if you order 30 by 3's they are a very small thick tube and labeled only with the 30 by 3 numbers on them.
We ordered some B F Goodrich 31 by 4's for our 24 Studebaker and they were back ordered for 18 months but Coker sent us 30 by 3 1/2 tubes to go in the 31 by 4 tires so tubes can be stretched a whole lot when you are out of luck.
Below is a part of our Club's order from Coker.