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Tiagra shifter compatibility

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Tiagra shifter compatibility

Old 08-31-10, 06:12 AM
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Tiagra shifter compatibility

Recently bought a Surly Crosscheck frame that came with Shimano Tiagra shifters. Wired it all up with my old rear derailleur to find out that the pull ratio is half of what the rear derailleur expects (two clicks to shift, can only get half way up the cassette).

Will the Tiagra long cage (RD4500-GS) work fine with an 11-28 rear, 48/36/24 triple front? Is there a better suited rear derailleur that would work here, and maybe with the Sugino 50/36/24 crank?

Thanks in advance, most appreciated.
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Old 08-31-10, 07:28 AM
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In regard to rear derailleur cable-pull-ratio compatibility with your Tiagra rear shifter: any Shimano or Shimano-compatible rear derailleur (at least from the last 25 years or so) will have the 1:2 cable pull ratio that you need except for 8 speed or earlier Dura Ace models or one of the just introduced Shimano Dyna-Sys 10 speed mtb rear derailleurs.
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Old 08-31-10, 09:33 AM
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Originally Posted by abdon
RWill the Tiagra long cage (RD4500-GS) work fine with an 11-28 rear, 48/36/24 triple front? Is there a better suited rear derailleur that would work here, and maybe with the Sugino 50/36/24 crank?
With those chainring/cassette combinations, you're technically exceeding the max capacity of a Shimano road long-cage derailleur; to run a chain that is still long enough to prevent a disaster in the large/large combination, your lower run of chain will lose tension once you drop below the five largest cogs when riding on the small chainring. While you could still make this work by avoiding those gears, a long-cage Shimano mtb derailleur (SGS) will handle enough chain to manage all combinations. As well biked stated, you'd need to avoid one of the new XT or SLX derailleurs with Dyna-Sis.
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