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9/10 speed rear derailleur compatibility

  • This topic has 12 replies, 8 voices, and was last updated 12 years ago by Accessibility for all.
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  • May 21, 2014 at 8:04 am #21488
    Accessibility for all

    My Tiagra 4500 9-speed rear dérailleur has so much play now that if I select the lowest gear, the cage hits the spokes. Obviously this is a bad thing and I want to replace it immediately. The trouble is, they’re like hen’s teeth. There are plenty of 10-speed dérailleurs out there, but before I order anything, I want to confirm that 10-speed is compatible with 9-speed.

    I’ve found conflicting claims on the internet, related to pull ratios. Can anyone put my mind at rest and let me order a new 10-speed dérailleur? I’d rather not upgrade the entire drivetrain as I’ll be buying a whole new bike later this year.

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  • May 29, 2014 at 5:54 pm #794807
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    Accessibility for all

    Just to let people know, I
    Just to let people know, I replaced the old, worn out Tiagra 4500 dérailleur with a 105 5701 10-speed. It shifts perfectly, there are no issues. It’s totally compatible.

    As an aside, shifting is now hugely improved. Mind you, the old dérailleur really is a floppy knackered old thing with play in every direction. I’ll take the (almost new) jockey wheels out of it and retire it to the recycle bin.

    Thanks for all the help.

    May 22, 2014 at 1:08 pm #794805
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    The _Kaner

    ST4500 shifters are showing
    ST4500 shifters are showing as being compatible with the following rear derailleurs:
    RD-7800
    RD-6600G
    RD-6600
    RD-5600
    RD-5600L

    E of the bay dot com showing RD-4500 at under £30 (free p+p)
    http://www.ebay.co.uk/itm/Shimano-Tiagra-Rear-Derailleur-RD-4500-SS-9-Speed-Silver-Road-New-/230920083513?pt=US_Derailleurs_Rear&hash=item35c3e8d839

    If that’s any help….

    May 21, 2014 at 8:27 pm #794803
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    archie gordon

    I have a 105 ten speed
    I have a 105 ten speed derailleur on one of my bikes with tiagra 9 speed shifters
    just use the limit screws to stop it going to far. never had a problem with it

    May 21, 2014 at 6:32 pm #794801
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    carytb

    You could try a Deore 9 speed
    You could try a Deore 9 speed mtb derailleur. I have got one on my Tiagra specked Croix de Fer

    May 21, 2014 at 4:01 pm #794799
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    Chris James

    Are you sure it is play in
    Are you sure it is play in the mech, rather than a bent gear hanger?

    I have never known that much play is a rear mech, in fact I wouldn’t have thought it possible unless it was literally falling to pieces.

    May 21, 2014 at 3:57 pm #794797
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    Accessibility for all

    The CRC description for a 105
    The CRC description for a 105 5701 rear mech says it’ll work with 8, 9 and 10 speed systems, so I’m going to buy one of those. If it doesn’t work then I can just return it.

    Thanks all for the replies, I will post back with results.

    May 21, 2014 at 3:48 pm #794795
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    Accessibility for all

    glynr36 wrote:Chain Reaction

    glynr36 wrote:
    Chain Reaction have Sora 9 speed for £18, if you’re replacing the bike this year that should see you through.

    I’m not sure if I’ll keep the bike or not (probably not) but this is a good suggestion, thanks.

    May 21, 2014 at 3:48 pm #794793
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    Accessibility for all

    This is the problem, see –
    This is the problem, see – 50% say one thing, 50% the other.

    I wonder if Shimano produce a compatibility table.

    May 21, 2014 at 3:22 pm #794791
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    adamthekiwi

    However, see:
    However, see: http://jtekengineering.com/shiftmate.php

    May 21, 2014 at 3:18 pm #794789
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    adamthekiwi

    I tried to use a 10-speed
    I tried to use a 10-speed shifter with a 9-speed derailleur (105 shifter and Deore rear derailleur on my touring bike) and the pull-ratios meant that it just would not work – the total amount of cable pulled was not enough to move the derailleur from top to bottom. The opposite will probably be true of trying apply a 9-speed shift to a 10-speed derailleur – the cable-pull per index stop will be larger than the derailleur is meant to handle.

    May 21, 2014 at 9:33 am #794787
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    therevokid

    ran a 10 speed ss mech on my
    ran a 10 speed ss mech on my 9 speed tiagra sti’s for ages without any problems

    May 21, 2014 at 9:14 am #794785
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    glynr36

    Chain Reaction have Sora 9
    Chain Reaction have Sora 9 speed for £18, if you’re replacing the bike this year that should see you through.

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