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  1. #1
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    Chainring sizes for triple crank

    Building a crank and just wondering if the combination I want is possible to achieve without some kind of shifting problems, ect. What I want to use is a 50/36/22 chainring setup in the front using an I.R.D Alpina D derailleur and a 13-34 gear cassette in the rear, thanks in advance for any info

  2. #2
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Eric630 View Post
    Building a crank and just wondering if the combination I want is possible to achieve without some kind of shifting problems, ect. What I want to use is a 50/36/22 chainring setup in the front using an I.R.D Alpina D derailleur and a 13-34 gear cassette in the rear, thanks in advance for any info
    Possible? Certainly with TA Carmina crank with a 58/94mm bolt pattern spider: http://www.peterwhitecycles.com/carmina.asp . I don't think the TA chainrings are ramped & pinned, so you'll have to be patient with the shifting- it won't be as point-and-click as newer designs. Also, that's a pretty big jump from middle to outer. IMO, you're better off with a slightly larger middle chainring since you'll be going back & forth between those more often, leaving the granny for slow climbs.

    FWIW: I have a 24/42/52 with an 11-34 cassette. I do a lot of cruising in the middle chainring, use the big chainring when I'm in shape, and the granny when the terrain gets vertical.
    Jeff Wills

    Comcast nuked my web page. It will return soon..

  3. #3
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    I use a 48-36-22 setup on my touring bike with 13-34 in the back and shifted with an IRD Alpina-d front derailleur. I used a TA Zephyr crank in the past, but switched to a Deore MTB crank when I switched to a bottom bracket with outboard bearings for less bottom end flex. Same sized chainrings and cluster for both cranks.

    It shifts well with Tiagra brifters.

    If it's a touring bike, I'd question the need for a 50x13. If I spin out of a 48x13, I'm either riding a huge tailwind or I'm going downhill. Either way, I'll be coasting and enjoying the scenery.
    Last edited by xyzzy834; 03-26-11 at 11:37 PM.

  4. #4
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    Quote Originally Posted by xyzzy834 View Post
    Either way, I'll be coasting and enjoying the scenery.
    While I appreciate the relaxed riding style, I personally always like to be pedaling. I get restless after too much coasting. My tandem has a 54/42/24 paired with an 11-32.

  5. #5
    Old fart JohnDThompson's Avatar
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    I have 47-42-24 rings on my commuter bike and it works fine:


  6. #6
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    thanks for the info, Jeff my plan was to use the Carmina crank but I wasn't sure if the derailleur could handle it, I read somewhere that the inner chainring and outer chainring could only have a 22 teeth difference for shifting capabilities or something like that :-/ but now I have assurance the setup I want will work.

  7. #7
    Fail Boat crewman
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    FSA Energy 53/39/30 with 12-25 on the rear. No problems here. BCD is 130 so replacements are a snap.

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