My road bike has a cassette with 12-25t. Time to replace as it is worn. Having difficulty finding another cassette with the same number of teeth. I can find, for example, 11-25t, 12-26t or 11-26t. Does the number of teeth have to exactly match the cassette being replaced?
Will the cassettes with the different teeth count work on my road bike?
Shimano makes 12-25 10 speed cassettes in every product grade from Tiagra to Dura Ace. You shouldn't have any problems finding one. If your bike has an 8 or 9 cog cassette, then YMMV, but 12-25 used to be the standard 8 speed 2300 cassette from Shimano.
I know that Performance still has quite a few 10 speed Ultegra cassettes on hand. I just ordered one. 😉