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  1. #1
    Join Date
    Jun 2005
    Location
    behind the white pine tree
    Posts
    80

    compact double question

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    Hi,
    I have a compact double on my road bike. I've noticed a bit of chain rub when I am in the big ring and the largest cog (easiest gear) at the back. The chain rub disappears when I drop it down to the 2nd largest cog.

    Is it normal to have a bit of chain rub with that gear combination, or do I need a small adjustment? I'm more familiar with triple chain rings, and do know that in a triple chain ring configuration you're not supposed to use your easiest gear at the back and your largest ring at the front (or hardest gear and smallest ring), but wasn't sure if the same held true in a compact double.

    thanks

  2. #2
    Join Date
    May 2008
    Location
    northern Virginia
    Posts
    5,827
    I don't use the big ring much on my bike due to knee issues, but I have similar experience when in the small ring and smallest cog. It's that way regardless of any adjustments that are done on my derailleurs.

    So I only ride in that combination for short stretches, otherwise I shift up to the big ring.

    - Gray Trek Madone 4.7 road bike, mystery crack in top tube repaired by Calfee, Bontrager Affinity RXL saddle
    - Red Trek 6000 mountain bike, Bontrager Evoke WSD saddle

    Gone but not forgotten:
    - Silver Trek 2000 road bike
    - Two awesome and worn out Juliana saddles

  3. #3
    Join Date
    Jun 2008
    Location
    Abq, NM
    Posts
    309
    It's cross chaining. You might be able to adjust it away. Not a lot of play at those settings.
    Lookit, grasshopper....

  4. #4
    Join Date
    Nov 2009
    Location
    West MI
    Posts
    4,308
    It's less of an issue with my CD than with my triple, but I still avoid big-big and little-little combos. Just a gear or two either direction is fine.
    Kirsten
    run/bike log
    zoomylicious


    '11 Cannondale SuperSix 4 Rival
    '12 Salsa Mukluk 3
    '14 Seven Mudhoney S Ti/disc/Di2

  5. #5
    Join Date
    Jul 2004
    Posts
    2,617
    Cross-chaining is bad for your chain and the chain rings - it causes excessive wear, so try not to ride in those combinations. If you're halfway up a hill and it's too late to shift down, it won't destroy the chain immediately, but try to avoid either the big-big combination and the small-small combination.
    For 3 days, I get to part of a thousand other journeys.

  6. #6
    Join Date
    Dec 2006
    Location
    Columbia River Gorge
    Posts
    3,583
    Agreed, it is possible with a compact double to tune it such that you don't get chain rub in that combo but it's really not good for your chain, cogs etc so it's best if you avoid it.
    Living life like there's no tomorrow.

    http://gorgebikefitter.com/


    2007 Look Dura Ace
    2010 Custom Tonic cross with discs, SRAM
    2012 Moots YBB 2 x 10 Shimano XTR
    2014 Soma B-Side SS

  7. #7
    Join Date
    Jul 2004
    Posts
    2,617
    I meant to also add that in those combinations, you're putting maximum stress on your rear derailleur - it's using every link of your chain, so it has to get out of the way, or it's taking up the maximum amount of excess length in the chain, so it's very easy to damage your RD in these combinations.
    For 3 days, I get to part of a thousand other journeys.

 

 

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