The one problem is that none of the tires run the same size , you can get a 2.2 that is larger than a 2.3 ------------this is common with any tires on any vehicle .thrasher_s said:
I like to run a 2.5 tire in the rear and a 2.7 in the ft , my ft tire is a 2.5 Chunder SX that is actually 2.7.
I can run a 2.5 kenda nevegal stick-e on the rear ( generally the 2.5 kenda is dam neer a 2.4-2.5 ----they will be alittle different with each run of tire )
Some of he 2.5 Kenda's will just fit if you have your wheel trued nicley.
Some 2.5 tires you will have to mod your ft derailer in the rear to clear .
Most all 2.3 and 2.35 tires fit ( even if the wheel is alittle out ,whithout doing anything )
The 2.3 Eskar Specialized tires run real small ------they are like 2.1 to maybe 2.2 on some runs of tires.
I know this did not really answer your question correctly , -----but all the tires and sizes are so off, -----and some wheels are pulled to the left and some to the right ,------and different ft derailers have a different rear angle cuts to clear tire clearance , so it can hard to say .:madman:
Im sure others will chim in on what brand and size of tire they have on their bike and we can all use it as a referance on what will easily fit