Changing from a 52/39 to a compact

[jayonabike]

If I was to change from a double to a compact, apart from the chainset will I have to change anything else?

 

[MikeW-71]

Shorter chain too, otherwise... no, I don't think you would. Assuming the new chainset is compatible with your existing BB.

 

[jayonabike]

Going from a Rotor to Dura Ace (the rest of the groupset is Dura Ace) so just the Bottom Bracket as well then

 

[PatrickPending]

Chain length will depend on the number of teeth on the large ring on your front (assuming you don't change the cassette too) - You should be ok with your cage length on your rear mech but worth checking that too. Your BB may be ok - check the length recommended for the replacement chainset - oh and of course the fit (square taper, octalink etc...).

 

[boydj]

You may want to lower the front mech a touch, but it will probably be ok if the change is from 52 to 50 for the large chain ring.

 

[Newman8]

You may want to lower the front mech a touch, but it will probably be ok if the change is from 52 to 50 for the large chain ring.

Yes - no need to be fooled into buying a 'compact specific' front mech - lowering your normal one very slightly is ideal.

 

[Sharky]

Don't forget to study the gear tables before you change the front rings. You can achieve similar results by just changing the cassette to one which has a bigger sprocket and this might be an easier/cheaper option.

Sometimes with a compact, I find my self riding right at the top end of the 34 and to go higher I need to change both the front and back at the same time. When I used to ride with a 42-52, I would be able to stay on the 42 ring for most of the day, just changing up/down on the rear changer. Everything is a compromise.

Cheers Keith