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  1. #1
    official eMpTyBRain
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    Mach 429: Stem Length

    Just switched from a 90mm stem to a 70mm stem and I may need to slide the saddle back a wee bit. Had a 90 on there because of all the long steep climbing in my world. I'm hoping the 70mm stem will get me centered over the bike a little better on the downhill blasts.

    What stem lengths are you running on your M429s?
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  2. #2
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    Bike came with a 120, shortened it to 80. I have the seat back about as far as I want to go, so I don't think I'll go any shorter. I'm 5'8 on a small. Cockpit feels as comfortable as I can imagine.

  3. #3
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    I went from the stock stem to a 90/80/70 progression. Still on the 70mm stem with an uncut easton haven bar for 1.5 years now. Steep climbing and descending no issues, and plenty of room in the TT to work the tech. ups. I'm ~6.1 on a large 2010.5 429.

  4. #4
    Long Live the Gorn!
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    On a medium, 5' 10" Running the 70mm love the way it handles have my seat back a bit bit not much.

  5. #5
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    On a small running a 70 stem (5'6").

  6. #6
    Dirty South Underdog
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    Bike fit 101- Your seat should be set up for optimal power/endurance then the bars adjusted accordingly for your torso/arm length, flexibility, comfort, etc. Once your optimal position for the relationship of your butt to the bottom bracket is fit, you shouldn't go changing it because of what happens on the front end of your bike.
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  7. #7
    official eMpTyBRain
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    Update: did 17 miles on the 70mm stem yesterday. It feels different compared to the 90mm stem as far as turning goes. Maybe a little more sluggish and tight switchback turns pointed downhill seemed a little more challenging because it wanted to turn wider than before. Does that sound right to you guys?

    It does fell better when I'm pointed downhill though and climbing was fine. I thought I would need to move my saddle back a bit but it may not be necessary, after all.
    ...and proud member of the anti-sock puppet desolation

  8. #8
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    120 mm on my Large with a setback seatpost (I'm 6' tall, long torso, short arms and legs).
    Pivot Mach429

  9. #9
    Kiwi that Flew
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    Mach 429: Stem Length

    Bar width - this is also very important in cockpit feel. 710mm width min IMHO.

  10. #10
    official eMpTyBRain
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    Quote Originally Posted by deanopatoni View Post
    Bar width - this is also very important in cockpit feel. 710mm width min IMHO.
    That could never work for me. I have narrow shoulders. I have tried wide bars in the past and it felt like I was doing the splits with my arms.
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  11. #11
    Kiwi that Flew
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    Quote Originally Posted by Hawg View Post
    That could never work for me. I have narrow shoulders. I have tried wide bars in the past and it felt like I was doing the splits with my arms.
    Widebars aren't for everybody, but t's good to experiment. You are one step ahead of most people having tried and dismissed them. For me they worked out great for me, but I've got the Ape gene..!

  12. #12
    Tough Guy Extraordinaire
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    With wider bars a shorter stem is a bit nicer. I am 5'11" and ride a large 429c.

    I have 110mm, 9d, flat enve bars on the bike. I started with a 70mm stem and pulled it back to a 50mm to make it a bit quicker in the turns. I really love this set-up, but it may not be for everyone, just my $0.02.
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  13. #13
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    I'm 6' 3" and ride a large 429c with 80 mm stem and 740 mm bars. Perfect position as I really dislike being stretched out while riding technical sections..

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