105 rear mech max cog size

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This topic has 8 replies, 8 voices, and was last updated 8 years ago by ianfitz.

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105 rear mech max cog size
strike
Free Member

Time to replace the cassette on my road bike and the current set-up is a 10speed 105 short-cage rear mech and 12-30 cassette. I’d like to switch to 12-32 cassette but the 105 mech is only rated up to 30t – is this official ie definitely won’t handle a 32t max cog?

Posted 8 years ago

rezis
Free Member

My GT Grade is 11 speed 105 and has a 32t rear sprocket so it does work…

Posted 8 years ago

Stainypants
Full Member

If its a 5701 it will go to 32 if its 5700 officially 30t but I think you can push it by screwing in the b screw.

Posted 8 years ago

Fresh Goods Friday 700 - The censored edition

Mister-P
Free Member

My GT Grade is 11 speed 105 and has a 32t rear sprocket so it does work…

The Grade is specced with a medium cage rear mech which is designed to work with the 32T.

Posted 8 years ago

mikeyp
Full Member

Stainypants is right. It will run fine, may shorten the life of the derailleur, particularly if you 50-32 alot.

Posted 8 years ago

alanf
Free Member

My 5600 is only rated up to 27 I think, but I’m running 30.
I think the max is rated by the max available at the time which was probably 30.
I wouldn’t be surprised if 32 would work with a bit of tweaking of your set-up.

Posted 8 years ago

ghostlymachine
Free Member

Max is rated based on mech and frame geometry. Not what is available. 🙄

If your hanger is in a better position than the nominal one that shimano use, you’ll be able to go bigger.

FWIW I’ve not yet worked on a bike that *won’t* allow you to exceed the shimano specs by at least 2 teeth.

Posted 8 years ago

strike
Free Member

Thanks for the replies-I thought it would probably work but wanted to check before ordering/fitting.

Posted 8 years ago

ianfitz
Free Member

Wit B screw adjustments will tolerate a 36…

Posted 8 years ago