I think the B2 and B3 rims are the same, right? What is the difference between them and the B4? I think it is the offset but I don't know which wheels will stick out more or which ones will be in closer.

B4 wheels on a B3 make the rear narrow. While B3 on a B4 make it real wide.

How about the fronts?

to the top

b3 front rims on a b4 will make it wider not sure about the rears.

b3 rims(front and/or back) make the b4 illegally wide but if uyur track isnt teching run em....wider is more stableI run b3 fronts and b4 rears....helps it to track straighter. :wave: