Mrs Beener has a gravel bike that will happily take WTB Riddler in 37 flavour.
She was wondering about putting 650b wheels in it, to try and get some extra tyre volume.
Is there a formula for this, or should i just take a 640b mtb wheel and see how much space there is?
thanks
WTB used to have a page on their website listing frames that were ‘road plus’ (650b x 47) compatible.
If hers isn’t listed you still might be able to work it out by comparing measurements.
Is there a formula for this, or should i just take a 640b mtb wheel and see how much space there is?
Pretty much. There are some measurements floating around about the overall diameter of a 650x47 tyre. You can do some measurements using this, but take into account that most of these tyres have a lightbulb shape and they're the widest around the middle.
Also try to research the model of the bike you have, maybe someone else done the conversion.
In most cases there is clearance at the front but not at the back. Before investing in a wheelset I would buy the tyre you want to run, and a super cheap second hand 27.5 rear wheel. I bought one for 15 quid to check the clearance.
i have a couple of 650b wheels that will fit n the bike. However they currently have Bonty XR4 on them. These definately wont fit.
I will put a bare wheel in and see what the measurement looks like.