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Specialized Cirrus 4 groupset upgrade (lemm.ee)

submitted 9 months ago by [email protected] to c/[email protected]

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So I have a lovely Cirrus 4 that I call my adventure bike. Currently I am running the stock groupset that I would like to upgrade. This bike currently has a hyperglide hub and threaded bottom bracket. What I want to do is get a nice 1-by front ring and have a bigger range in the back. I am totally happy sacrificing speed for hauling so I would like to get something like a 42 in the front, and a 11-42 in the back. I don't have much experience with these lower tier groupsets and where the mountain bike compatibility starts and ends.

Has anyone done any kind of rebuild like this?

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[–] [email protected] 2 points 9 months ago

I can’t see why this setup wouldn’t work. I do favour a max of 36T with a smaller chainring up front. The shorter cage derailleur you can have the better. What you have here will work with a narrow wide chainring. You can space the BB for chainline :)