I’ve just found a Shimano 7 speed 12-28 cassette in Halfords - which is presumably even closer to my bikes 14-28 cassette/freewheel than an 11-28 would be?
Hi @Carlton_Flores welcome to Zwift forums.
We need more information to give you an answer. Are you asking if a 7 speed cassette is an acceptable replacement for the one on your bike currently? Or something to put on a wheel-off trainer that’s on par with what’s on your bike wheel?
go on amazon, type 14-28T, profit