I am farily new to cycling and roadbikes in general. I have bought a ( last years model ) roadbike with an 8 speed casette in the back. I also bought an indoor trainer ( 2nd hand ) and got a spare wheel with special training tyre on it. However, the casette on the spare wheel is an 11 speed. I have tried to fit that wheel on my bike, but the 11 speed does not ride well on my 8 speed bike. I took it off to prevent any possible damage to the bike and or wheels.
Is it possible for me to simply take out 3 cogs from my 11 speed wheel, and thus make it an 8 speed? If so, how do I determine which ones to take out? Or would it be better if I 'downgrade' my spare wheel to an 8 speed? Or upgrade my bike to an 11 speed ( but I think this will be to expensive for me right now )?
Keep in mind the bike is new, so the 8 speed casette is not even worn out. The 11 speed wheel is used, but looks in very good shape. Also my budget is very limited. Thanks for any helpful tips