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 Post subject: 7900 dura ace rear mech
PostPosted: Fri Jan 18, 2013 2:04 pm 
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Joined: Thu Dec 20, 2012 10:18 am
Posts: 41
Location: West Midlands, UK
Hi, I was reading a recent review of dura ace 9000 which said 'and the rear mech can now take a 28T rear cassette'. I have a 2012 S-Works Tarmac SL4 with dura ace 7900 throughout and am hoping to swap out my stock 12T-25T dura ace cassette for an 11-28T one (i'm going to the alps later in the year). Can anyone shed any light on whether this will work OK?

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PostPosted: Fri Jan 18, 2013 2:37 pm 
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Location: Pedal Square
Yes, the RD-7900 is spec'd for 28t max, there's also a cassette to go with.

(Personally I'm using the 7900 with the 11-28 SRAM Red cassette)

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Posted: Fri Jan 18, 2013 2:37 pm 


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PostPosted: Fri Jan 18, 2013 3:03 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2196
Location: Santa Cruz, California, USA
Shimano's spec is conservative, both for max cog size and for chain wrap. I've gotten a 7900 to handle a 30t cog. How far you can go depends on the geometry of your frame's derailleur hanger.


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