Originally Posted by
dirtydozen
Thank you.
Actually if it helps it's a 3400 sora as front derailleur and the rear derailleur would be either sora 3500 or sora r3000 (didn't buy it yet and my current tiagra 4600 needs replacement to have a bigger capacity and to allow more than 27T at the back)
I just reread your post. Sounds like you will be replacing the whole drivetrain. Go to ebay. You should be able to find a good, used higher level 9 speed system for a good price.