jplundma

Hello all!

First Post,
My wife and I are looking to start indoor biking on a trainer. Going with a direct drive. I am looking to make for easy bike switches. Currently the bike drive systems are different.

My bike is using:
Shimano Tiagra 9 speed with 11-25T cassette

My wife's bike is using
Shimano Sora 9 speed with a 12-32T cassette

How would I go about creating a comparable system for indoor? Is it as simple as putting a cassette on the bike (like a 11-27T) and attach bikes or will i need a different derailleur and chain on one bike to accomplish this?

Thank you all in advance!

Russ Roth

Biggest thing is seeing the largest cassette your bike can run and put that on the trainer, your wife will just have to cope with whatever cassette that happens to be. Both bikes are 9 speed so they really aren't that different for this purpose. Her's starting with a 12t might mean that if the cassette starts with an 11t the der might not take up all the slack, not really a big deal with a trainer but if you can find one that starts with a 12t it might be better. From there, put each bike on, adjust the der if it needs it the first time and you're all set.

jplundma

Are there concerns that say a 27T would be to small for her derailleur?

Russ Roth

None, the concern would be that it might be too big for yours, have to put it on your bike and test it. Her bike already uses something close to that in its climbing range and will have no trouble.