My kid's road bike has an 8-speed Claris groupset on it. I bought the bike used, and the rear and front derailleurs have always given us fits. I can't get them adjusted correctly, and they fall out of what little bit of adjustment I can achieve pretty quickly.

I have an older 105 8-speed rear derailleur and matching front derailleur on an older tri bike that never gets ridden. While they are older, they shift great. Can I just switch out the derailleurs or would it require changing the brifters?

Thanks,
Matt