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new rotors, chain, cassette and chainring.
If you’re not doing any hard riding on the commuter, it might be worth replacing the rotors and leaving the drivetrain as is, depending on if the drivetrain is already very worn.
You’d have to monitor the chain since you don’t want it snapping on you; I’ve seen chains worn beyond 1.5% that still function. You might be able to save up for replacements in the meanwhile.
I have/had two bikes that I was considering amalgamating:
I started to use the former more for commuting and the latter just for wet weather commuting. Rarely ride cross or gravel, as much as I like the latter.
I was thinking of a good disc road bike that I also used for commuting, as security is fine at work.
Then on Saturday, I got a call from the bike shop I'd taken the cross bike to, to say that it didn't just need a rear brake service, but instead new rotors, chain, cassette and chainring.
Later on Saturday, I wrote off my road bike in a freak wheelie-suitcase related incident that has cracked the seatstay.
I don't really have any money for an upgrade that doesn't come from selling what I've got.
What would you do?