5700 5800 Compatability

nicksun
nicksun Posts: 290
edited August 2014 in Workshop
Hi, Would an RD 5800 work with a 10 speed chain and more importantly, 5700 shifters?
Cheers.

Comments

  • ic.
    ic. Posts: 769
    Yeah should do, if using a 10 speed cassette. The RD is just a spring at the end of the day, it'll move however far the shifter pulls the cable
    2020 Reilly Spectre - raw titanium
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  • styxd
    styxd Posts: 3,234
    IC. wrote:
    Yeah should do, if using a 10 speed cassette. The RD is just a spring at the end of the day, it'll move however far the shifter pulls the cable

    Come on, that's not really true now is it!
  • nicksun
    nicksun Posts: 290
    IC that's what I thought about the derailleur but as a 10 speed chain is wider than an 11 speed chain, will there be tolerance issues?

    styxd, what do you mean? I realise it's slightly more than a spring but it will go where the shifter puts it, won't it?
  • ic.
    ic. Posts: 769
    I think, hope, he's joking

    The difference in width between 10sp chains and 11sp is tiny. So little so in fact that I've run a 10sp quick link on an 11sp chain recently without any issue. Consider also that a 10sp chainset works fine with 11sp set ups.

    You'll be fine. Bolt it on, cable it up and off you go :)
    2020 Reilly Spectre - raw titanium
    2020 Merida Reacto Disc Ltd - black on black
    2015 CAAD8 105 - very green - stripped to turbo bike
    2018 Planet X Exocet 2 - grey

    The departed:

    2017 Cervelo R3 DI2 - sold
    Boardman CX Team - sold
    Cannondale Synapse - broken
    Cube Streamer - stolen
    Boardman Road Comp - stolen
  • nicksun
    nicksun Posts: 290
    Cheers.
  • DiscoBoy
    DiscoBoy Posts: 905
    I've read some things which suggest that the cable pull ratio is different, so it won't work...
    Red bikes are the fastest.
  • ic.
    ic. Posts: 769
    But it's the shifter that pulls. The RD just moves as far as the shifter pulls it.
    Yes, the amount of cable pulled or released by the shifter is different between the two, but it only makes a difference to how far the RD moves in a given direction, which is required by the spaces between cogs on the cassette


    It'll work fine.
    2020 Reilly Spectre - raw titanium
    2020 Merida Reacto Disc Ltd - black on black
    2015 CAAD8 105 - very green - stripped to turbo bike
    2018 Planet X Exocet 2 - grey

    The departed:

    2017 Cervelo R3 DI2 - sold
    Boardman CX Team - sold
    Cannondale Synapse - broken
    Cube Streamer - stolen
    Boardman Road Comp - stolen
  • styxd
    styxd Posts: 3,234
    IC. wrote:
    But it's the shifter that pulls. The RD just moves as far as the shifter pulls it.
    Yes, the amount of cable pulled or released by the shifter is different between the two, but it only makes a difference to how far the RD moves in a given direction, which is required by the spaces between cogs on the cassette


    It'll work fine.

    Did you miss this bit?
    cable pull ratio
  • majormantra
    majormantra Posts: 2,094
    Some gross oversimplification going on here. RD geometry affects how far the mech moves for a given amount of cable pull. If you mix pull ratios it will not work properly. End of.

    What remains an open question is whether the pull ratio for rear shifting has in fact changed with 11 speed Shimano.
  • nicksun
    nicksun Posts: 290
    I've bought an RD 5700 now to be on the safe side. The reason i asked was because Ribble and Wiggle were out of stock of the 5700 ss.
  • styxd
    styxd Posts: 3,234
    Nicksun wrote:
    I've bought an RD 5700 now to be on the safe side. The reason i asked was because Ribble and Wiggle were out of stock of the 5700 ss.

    Phew, close call. Don't trust everything you read on the internet, there are some real jokers out there.
  • nicksun
    nicksun Posts: 290
    Cheers all. As with every seemingly simple question on here, it opens a can of worms!
  • DKay
    DKay Posts: 1,652
    IC. wrote:
    But it's the shifter that pulls. The RD just moves as far as the shifter pulls it.
    Yes, the amount of cable pulled or released by the shifter is different between the two, but it only makes a difference to how far the RD moves in a given direction, which is required by the spaces between cogs on the cassette

    It'll work fine.

    I bet it won't. The 6800 RD is known to not work in a 6700 set-up due to different geometry. Therefore, it stands to reason that a 5800 RD will not work in a 5700 set-up too, seeing as the former is derived from 6800 tech.
    N
    N+1

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