Rear cassette on shimano 105

Mickyg88
Mickyg88 Posts: 289
edited October 2011 in Road beginners
I'm considering buying a cannondale synapse carbon 105 which has a 12-25 rear cassette, are there any issues if I change this to a 11-28 or a 12-27? I'm new to road bikes so forgive me if its a stupid question. The reason I ask is that i'm getting on a bit and need all the help I can get climbing hills, I have a flat bar ridgeback hybrid at the moment and I dont half struggle up the hills on it.

Comments

  • wishitwasallflat
    wishitwasallflat Posts: 2,927
    for what you want check out SRAM Apex - they do a mountain kit for conversions gives you 11-32 lovely !

    http://www.bikeradar.com/gear/category/ ... t-11-45331
  • wishitwasallflat
    wishitwasallflat Posts: 2,927
    Sorry I should add - I am certainly no bike mechanic - but I think if you get the 11-32 cassette and APEX rear deraileur it should work with any chainset and ten speed shifter.

    If I am wrong I am sure someone will correct me here ....
  • parsons1927
    parsons1927 Posts: 31
    11-28 will be fine, got one with my 105 set up,
  • John.T
    John.T Posts: 3,698
    wishitwasallflat wrote:
    Sorry I should add - I am certainly no bike mechanic - but I think if you get the 11-32 cassette and APEX rear deraileur it should work with any chainset and ten speed shifter.

    If I am wrong I am sure someone will correct me here ....
    Consider yourself corrected. The SRAM mechs will only work with SRAM shifters. The cable pull is different. Cassettes are compatible.
    My Fleet.
  • speshsteve
    speshsteve Posts: 352
    I assume bike is new with 105 5700 if so then yes, if however its older then you can only go to a 27 on the rear.

    For whats its worth I have run a 28 on mine but its impossible to get it to shift really smoothly without any chain rub where as 27 and 25 on mine are peerrrfek

    forgot to say mine is older i.e. not the new 5700 range
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  • wishitwasallflat
    wishitwasallflat Posts: 2,927
    Thanks John.T
  • esspeebee
    esspeebee Posts: 174
    The Shimano website says that a 105 rear derailleur will work with up to a 28T sprocket. If you try to fit something larger, you'll find the rear mech colliding with the cassette when you try to shift to the lowest gears.

    So yes, 28T should be fine. If you want to go beyond that, you'll have to swap out the rear mech as well, probably for a 9-speed mountain bike model.

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