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  1. #1
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    Pivot Mach 429 Carbon - Size question

    Interested in your views on what size 429C I should order - S or M? Currently on a M4 Medium.
    My height is 5 foot 8.5 inches.
    Pivot say small - 5ft6 to 5ft10
    Pivot say medium - 5ft9 to 6ft1
    My main concern is the seat tube height on a small, as I run a seat height of 29inches from the centre of the bottom bracket to top of the middle of the seat.

    I will be using the bike to do everything - XC Racing, 6 hour endurance, general trail etc

    Appreciate your thought?

  2. #2
    King of Middle Earth
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    Look at it like this. If you ride sketchy stuff where fast and quick moves at all speeds are necessary, get the small. It will react faster.

    If you ride higher speed dirt where you are plowing downhill mostly w/o much in the way of twitchy, technical stuff, go for the medium.

    I'm 5'8.5" and I have a medium 429 (alloy). It's a little big, IMO. I went with a straight seatpost (always used laybacks on other bikes) and a slightly shorter stem to feel comfortable on this bike.
    fee-fy-fo-fum...

  3. #3
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    Pivot Mach 429 Carbon - Size question

    I'm 5'8.5", 170#. After test riding a small Mach 4 at my LBS, and finding it to be satisfactory, I ordered a 429C small. It is a little bigger than the Mach 4 Small. I'd agree that it is nimble, especially compared to the other 29er that I tested; Specialized Epic Marathon Carbons in Med & Lg. The Pivot is like a sports car, the Epics were like long wheelbase sedans.

  4. #4
    Long Live the Gorn!
    Reputation: bvader's Avatar
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    I am 5'10... probably really 5'9.5" and I am riding a medium and other than a little shorter in the TT than I am used to, the bike rides nimble but its still plenty of bike to ride.. I agree above at 5'8"ish I think small would be a great fit. Also the frame / fit seem to support tall / long seatposts for you longer than average seat height

  5. #5
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    Thanks for the feedback so far.
    Looks like the small will be the best fit for what I'm after as most of our trails are tight and twisty. Maneuverability is a key ingredient and it what has probably put me off a 29er up until now.
    Seems a bit weird ordering a small. Always had mediums.....

    Do you see any issues with the seat post sticking out basically 13inches from the collar?

  6. #6
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    Pivot Mach 429 Carbon - Size question

    Well, I'm not an expert, but I feel no issues with the short seat tube. But I do know the step over height is more manageable.

  7. #7
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    Thanks for this post i too am 5'8 1/2 and 190 plus and was wondering the same question. I have always had mediums and feel weird going with a small but this is good info to consider. Thanks

  8. #8
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    I'm in the same boat, Ozi. Always had Mediums, and ordering a Small just seems wrong. But given the Pivot sizing guide, and the solid advice above, I'd wager that small is the way to go. I once had a Medium race bike that I just had to have, and it never did dial in the way I needed it to for more technical courses. Too long for steep climbs and a challenge to get over the back end on descents. Given that test riding a 429c is near to impossible in my area, I have only tried a 5.7c Medium. It was too big, just like that race bike I had.

  9. #9
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    im 5'8 3/4" using SMALL 429c with 90mm stem. friend with similar height also feels the size is just right...
    PIVOT

  10. #10
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    I'm 5'8 1/2" with 30 inch inseam and have a M Yeti 575 and Enduro. I demoed both the S & M 429c on long rides. Loved both, but thought S had a more comfortable reach. On the S, it was easier to stay balanced and weight the wheels. I felt more in control on the S in difficult terrain.

  11. #11
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    I just called a shop in Michigan where I will be visiting soon to rent a 429. They had initially sized me up for a medium, but then decided to put me on the small because of the way the frame sizes run. I too thought this was weird but I'd rather be on a bike that's a bit smaller than a bit bigger.

    For reference, I'm about 5'8, 160 lbs, medium build.

    I'll follow up in this thread if I find that the small isn't big enough.

  12. #12
    Get to dah choppah
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    IMO you'll likely be best fit on a small. I'm 6'0" and am very comfy on a medium.
    Santa Cruz TBc
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  13. #13
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    I read this thread 30 times when ordering my new 429c and went back and forth over and over regarding small or medium. I just couldn't get my head around being on a small bike at 5'9" on the nose. I test rode the Medium, loved it, but did think it felt a bit big for me so I went ahead and ordered Small.

    I've messed around with the fit some but am now super dialed with an 80mm stem and a dropper post on the Small. I have about 500 miles on it in everything from XC races to Shuttles. It's pretty whippable for a 29er and fast in techy stuff but still climbs insanely well. Seriously, the bike is an insane climber whether on fireroads, pavement or techy single track. I was on a Mach 4 previously (medium) which was a pretty good climber too but the 429 is in its own league.

    So - for anyone else out there going through same machinations 5'9" and Small works well.
    Previously known as mttamrnr.

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