27.5 to 29er front. Slacker angle vs bigger diameter rolling effect?- Mtbr.com
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  1. #1
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    New question here. 27.5 to 29er front. Slacker angle vs bigger diameter rolling effect?

    Ok simple question

    Going from 27.5x3 in front to 29x2.6 is about one degree slacker angle which is not good to roll but at the same time youíre running bigger diameter wich is good to roll

    So with this new setup is going to roll faster slower equally?

    Thanks!

  2. #2
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    Why is slacker not good to roll?
    Do the math.

  3. #3
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    Quote Originally Posted by Lone Rager View Post
    Why is slacker not good to roll?
    As far I know xc bikes are about 69 slack vs the 66 of enduro

    However letís no get in other sub-thread

    You got a 27.5x3 bike with 69 slack angle, you put some 29x2.6 front that gives now 68 but you get more diameter

    Itís going to roll faster slower or same?

  4. #4
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    It will roll faster because 29ers roll faster than 27.5 x 3s.

    Slacker does not make a bike roll slower, in general terms it makes it less manueverable but adds stability (for going faster) in return. However, no offroad bike should be on a 69 degree HTA regardless of the application imo so I don't see even a loss in manueverability going to a 68 HTA.

    The only negative I'm seeing is the slacker STA and maybe the increase in the BB height.

    Good luck.

  5. #5
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    Right, wheel diameter and tire rolling resistance have the greatest impact on speed. Just try different things and see what works for you. Guerrilla Gravity bikes now have a GeoAdjust headset which includes a 0 and 15mm lower cup to encourage the rider to try different reach, wheelbase, and stack height to find what works best for them. I put a 15mm lower cup on my Ď14 Stache to slacken it and enjoy the stability going down and everywhere my full squish goes.

  6. #6
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    Quote Originally Posted by Suns_PSD View Post
    It will roll faster because 29ers roll faster than 27.5 x 3s.

    Slacker does not make a bike roll slower, in general terms it makes it less manueverable but adds stability (for going faster) in return. However, no offroad bike should be on a 69 degree HTA regardless of the application imo so I don't see even a loss in manueverability going to a 68 HTA.

    The only negative I'm seeing is the slacker STA and maybe the increase in the BB height.

    Good luck.
    Hey men thanks for you answer

    You mean itís going to be more hard to handle in tight turns for example?

  7. #7
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    Quote Originally Posted by Heist30 View Post
    Right, wheel diameter and tire rolling resistance have the greatest impact on speed. Just try different things and see what works for you. Guerrilla Gravity bikes now have a GeoAdjust headset which includes a 0 and 15mm lower cup to encourage the rider to try different reach, wheelbase, and stack height to find what works best for them. I put a 15mm lower cup on my Ď14 Stache to slacken it and enjoy the stability going down and everywhere my full squish goes.
    is there a headset that allows to get steeper? I donít want to go any slacker

  8. #8
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    There are angle headsets but they are generally designed to slacken. Realistically the difference in 27.5x3 vs 29x2.6 diameter is nominal and increasing fork sag is enough to compensate for maintaining current ride height geometry. Try not to overthink this...maneuverability is most useful in slow technical XC style climbing where 80mm-100mm short travel forks are the norm. So if your intention is for this to be an XC climbing machine, shortening your fork ride height may accomplish this, especially if your mid-phat has a 120mm fork.

    Quote Originally Posted by Heavenknows View Post
    is there a headset that allows to get steeper? I donít want to go any slacker

  9. #9
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    Quote Originally Posted by Heist30 View Post
    There are angle headsets but they are generally designed to slacken. Realistically the difference in 27.5x3 vs 29x2.6 diameter is nominal and increasing fork sag is enough to compensate for maintaining current ride height geometry. Try not to overthink this...maneuverability is most useful in slow technical XC style climbing where 80mm-100mm short travel forks are the norm. So if your intention is for this to be an XC climbing machine, shortening your fork ride height may accomplish this, especially if your mid-phat has a 120mm fork.
    Oh then is ok, no im not interested in that stuff i ride wide trails, high speed confidence and a better rolling for long distances is my target

    Yes seems that that 29er in the front its going to be nice to me and my bike just as a freeze beer in a hot day

  10. #10
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    So sounds like youíll be running Mullet+(29f, 27.5+r)... I do this on my FS and really like it.
    2018 YT Jeffsy 29 AL | 2014 Trek Stache 6 | 1992 Trek Antelope 830 | 2015 GT Zaskar 29 Sport(deceased)

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