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  1. #1
    Senior Member tjk23's Avatar
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    Chainring Question

    I currently am running a compact (110mm) 52/38 FSA chainring. I have a big ride coming up in June in the mountains 100 mile 13000 ft of climbing. I am wanting to put a 34t inner ring on and am wondering what exactly I need to do. Are all brands compatible as long as they are 110mm? I have found some on ebay for around $20 just wondering if it would work. I don't want to spend a lot on it because it will be used very little, just want to make sure it will work without problems.

    http://shop.ebay.com/i.html?_nkw=34t...43c4d2f8&vil=1

  2. #2
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    The shift may not be as smooth, but it will work.

  3. #3
    coprolite fietsbob's Avatar
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    It is a big jump, , 18 teeth , you could pick up a smaller big chairing too..
    or make the small one a 36 52 combo, those were really common
    on bikes in the past.
    50, 34 or 48 34 are the new thing..

    should be able to change chainrings without removing
    the crank.
    need a 5mm allen wrench and a special but inexpensive tool
    to hold onto the nut on the opposite side,ring nut has notches

    Your local bike shop is where i'd look 1st.
    Last edited by fietsbob; 05-25-11 at 06:18 PM.

  4. #4
    Senior Member tjk23's Avatar
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    I mainly looking to just change the small ring for some of the steeper climbs. One of the major climbs has some 18-20% grades and is 63 miles into the ride.

  5. #5
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    52 and 34 make too big of a jump, and may cause chain problems with the derailleurs.

  6. #6
    Gear Combo Guru Chris_W's Avatar
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    There is no need to change the big ring if you're prepared to put up with the big change in cadence when shifting. The 52-34 jump should work OK, but not super smooth. If you can install a Third Eye Chain Watcher or K-Edge Chain Catcher to prevent the chain from derailling off the inside then that would be a good safety precaution.

    To get as low as gear as possible for those 20% walls then you could even get a 33 tooth inner ring, TA Specialites makes one, but many companies have 34 as their smallest 110 BCD ring.

  7. #7
    coprolite fietsbob's Avatar
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    once you are in that small gear , you need to be at the crest of the hill
    and coasting down the other side to do that upshift, and in that low ring
    there is a likely hood of dragging the chain against the side of the big chainring

    in the smaller gears on the rear wheel..

    check out the ratios : http://sheldonbrown.com/gears/

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