150/135 and dual rings- Mtbr.com
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  1. #1
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    150/135 and dual rings

    Noob question for sure,
    but I'm planning my first 'big' bike, and wondering:
    is a 150mm rear strictly meant for single ring up front? Or will a dual ring be ok? I've read some posts that their chainline is all f'd up w/ a dual up front & a 150 rear. I'm specifically looking at the 7-8" VPP bikes (VPF and Uzzi). I see the uzzi has the 135 option--is that for a dual ring setup?
    Thanks,
    John
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  2. #2
    BrassBalled DropbarNinja
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    Quote Originally Posted by Biker75
    Noob question for sure,
    but I'm planning my first 'big' bike, and wondering:
    is a 150mm rear strictly meant for single ring up front? Or will a dual ring be ok? I've read some posts that their chainline is all f'd up w/ a dual up front & a 150 rear. I'm specifically looking at the 7-8" VPP bikes (VPF and Uzzi). I see the uzzi has the 135 option--is that for a dual ring setup?
    Thanks,
    John
    the spacing in the rear depends on the dropouts... shouldnt mess with your chainline if you got the correct spindels for bottom bracket...

  3. #3
    Is flexy
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    works fine if you have the correct spindle length on the BB. I had a 150mm rear end set up with a dual up front using saint cranks and it worked well. I've heard you should use the saint front deraileur that is designed to work with the different chain lines associated with a 150mm rear end/83mm BB. I used the above mentioned saint deraileur FWIW.

  4. #4
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    To answer your question, dropout spacing has nothing to do with ring combos. You can run as many rings as you want on either 135 or 150 spacing.

  5. #5
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    Quote Originally Posted by mrpercussive
    the spacing in the rear depends on the dropouts... shouldnt mess with your chainline if you got the correct spindels for bottom bracket...
    Cool; I've got some new Saint cranks w/ the integrated BB---so it should be fine w/ correct spacers then you are saying?
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  6. #6
    Is flexy
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    Quote Originally Posted by Biker75
    Cool; I've got some new Saint cranks w/ the integrated BB---so it should be fine w/ correct spacers then you are saying?
    Yes, you are fine.

  7. #7
    Glad to Be Alive
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    Quote Originally Posted by Dusty Bottoms
    To answer your question, dropout spacing has nothing to do with ring combos. You can run as many rings as you want on either 135 or 150 spacing.
    this is true
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  8. #8
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    Quote Originally Posted by Biker75
    Cool; I've got some new Saint cranks w/ the integrated BB---so it should be fine w/ correct spacers then you are saying?
    integrated? if by that you mean x-type then yes you'll be fine...
    unless there is a new bb design coming out...
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  9. #9
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    Quote Originally Posted by chooofoojoo
    integrated? if by that you mean x-type then yes you'll be fine...
    unless there is a new bb design coming out...
    nah, not the new stuff, but the shimano external kind...

    ALSO,
    why the 150mm size anyway?? Percieved/actual benefits?
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  10. #10
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    Quote Originally Posted by Biker75
    nah, not the new stuff, but the shimano external kind...

    ALSO,
    why the 150mm size anyway?? Percieved/actual benefits?
    In theory the 150 rear end is stiffer then they use the 83mm BB to compensate for the larger rear end and so you don't have a retarted chainline. I misread you original post but as other have said the rear spacing doesn't matter as far as how many rings you can run.

  11. #11
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    Cool,
    thanks for everyone's help....now time to make a decision i suppose.
    Beer has food value. Food has no beer value.

  12. #12
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    Quote Originally Posted by Biker75
    nah, not the new stuff, but the shimano external kind...

    ALSO,
    why the 150mm size anyway?? Percieved/actual benefits?
    The reason for 150 is to strengthen the rear wheel. On 135's the drive side spokes are straighter laterally. The idea of 150 moves the disc side flange out 20mm more. The rim moves along with it to the disc side of the bike. this now allows the drive side spokes lean in at a better angle instead of being straight.(Do you get the picyure?) It evens the tension of the spokes better. (Example- If you take a wheel and squeeze 2 spokes together on the drive side, you'll notice they're a lot tighter than the disc side.) Because of the wider hub it would throw off your chainline tremendously on a bike using a 68-72(73?)mm BB. The BB is widened to realign the ring with the cassette. Fahn
    Hubbard Bike Club

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