tiagra RD-4500-GS

paul.k
paul.k Posts: 90
edited April 2010 in Workshop
will this work with a 9speed 11/28 cassette, i have a tigra mech on the rear already but its only a compact chainset with a 26 fitted so i am thinking i have to change the mech and chain as what has come standard will probably be the 4500ss rather than the gs
it stated on shimano site max size as 27 for the gs but also says 27 for the ss so i am thinking this could be a misprint. alternatively the ultegra says it will take a 28 but is £30 more.

Comments

  • sungod
    sungod Posts: 17,414
    the difference ss vs. gs is the capacity, not the maximum cog size on the cassette

    capacity is the sum of the differences between the largest/smallest cogs on the cassette, and the largest/smallest chainrings

    rd-4500 ss has a capacity of 31t, gs is 37t

    examples...

    11-27 with 50-34, capacity 32t - use gs

    11-28 with 53-39, capacity 31t - use ss

    probably be ok with ss on 28 as long as it's within capacity
    my bike - faster than god's and twice as shiny
  • John.T
    John.T Posts: 3,698
    The SS mech will work fine with a 50/34 and 12/27 and with care in chain length setting will work with an 11/28. This is right on the limit of how much chain it will take up. The B screw adjustment will also need care. The GS will handle the chain take up better but will not take any bigger sprockets.
    My Fleet.

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