Shimano Sora 2x7sp STI set compatibility
 

I'm wondering if this would fit my 7 speed Schwinn Paramount with a 105 group. Also, what other gear cluster (RSX or older Shimano's?) would fit this shifter set? Thanks in advance.

Any 7-speed Shimano cassette (or freewheel, if that's what it uses) will work. There is no need to match the group.

The RSX 7-speed will work fine. Are you replacing other brifters or downtube shifters?

Yes, I would like to convert my Paramount to Sora Brifters (' has downtube shifter) and I want to do the same with my Raleigh R300. The latter has an RSX group (low end brifters, I know :o ), with the left brifter failing from time to time (down shift tab won't catch). I thought I'd just replace both brifters on the Raleigh just to keep it uniform, but I want to make sure that the FD, RD and rear clusters are compatible with Sora brifters. If this isn't the case, I'll just go with a set of barend shifter. I'm really hoping it would be compatible as I like brifters better.

Anyone know if there's a repair kit available for RSX 7 shifter?

Ha!

Read the 5000 threads on brifter repair.

Can of WD40 to flush followed by some Triflow to relube probably will solve your problems. Good luck finding a new set of 7 spd brifters for the other bike, though.