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Thread: Puffin sizing

  1. #1
    mtbr member
    Reputation: simen's Avatar
    Join Date
    Oct 2004

    Puffin sizing

    I'm between M and L and don't know which one would suit me better. I'm 1.78cm, normal proportions. I have two short bikes, Jones and Cube Stereo 29er fully with short stems and Loop bar on the Jones to shorten it some more- so no problems with Puffin decision here. But Puffins are going to be nimble with their short CS and a slightly more stretched out position on a snow bike can't be wrong for weight distribution. The Puffin's geometry was accepted well but I must admit I don't really get it. Super long TT (620mm for L size) with short ST (450mm- OK this is mandatory for snow bikes). I can use 410mm thomson set back post on a M frame or straight on L, play with stem lengths, etc...
    SInce I'm new to fat bikes I'm interested if there's any different 'approach' to bike geometry and size choosing.

  2. #2
    mtbr member
    Join Date
    Feb 2013
    I am 178cm and ride a medium Moonlander which fits great. Top tube of the medium Puffin is close so would have chosen medium, no way large for me. The reach on the medium Puffin is already over an inch longer than the Moonlander.

    Medium Puffin

    Medium Moonlander

    Small (16) Medium (18) Large (20) xLarge (22) xxLarge (22L)
    Seat Tube Length
    406.4 457.2 508.0 558.8 558.8
    Top Tube Length
    555.2 570.8 590.2 607.3 620.6
    Effective Top Tube Length
    575.0 595.5 615.0 630.0 645.0
    Head Tube Angle 70.5 70.5 70.5 70.5 70.5
    Seat Tube Angle 73.0 73.0 73.0 73.0 73.0
    BB Drop 60.0 60.0 60.0 60.0 60.0
    Chainstay Length 450.0 450.0 450.0 450.0 450.0
    Wheelbase 1073.4 1093.9 1114.8 1130.7 1146.4
    Standover Height 771.1 800.1 833.8 868.0 875.0
    Head Tube Length 110.0 120.0 140.0 160.0 175.0
    Fork Length 447.0 447.0 447.0 447.0 447.0
    Fork Rake 43.0 43.0 43.0 43.0 43.0
    Stack 580.1 589.5 608.3 627.2 641.3
    Reach 397.7 414.8 429.0 438.3 448.9


  3. #3
    aka bOb
    Reputation: bdundee's Avatar
    Join Date
    Feb 2008
    IMhO you don't adjust a bikes size with a straight or setback seatpost. That is for proper position over the pedals only and is affected by the seat tube angle more than anything. In other words you should be using the same seatpost in either a medium or large frame of the same model.

  4. #4
    mtbr member
    Join Date
    Oct 2011
    Do you intend to use the bike primarily as a snow bike or will it be ridden on trails most of the time. If it is for snow I would recommend a med. On soft snow (or sand) you want your weight off of the front tire a little more than a bike ridden on trails. That is why the head tubes are longer on fat bikes. I ride a med Mukluk but my Salsa El Mariachi is a large in order to give me the reach I need.
    P.S. I agree with bdundee , Do Not try to adjust your fit by moving your seat farther forward or back. Set it for proper position over the pedals.

  5. #5
    mtbr member
    Join Date
    Jan 2011
    Just to keep this thread alive...

    Im 187cm (6,1 feet) tall with 92cm inseam (36,2 inch). Long legs compared to "normal" in my height.
    I have a size L Singular Swift and pretty much based on that Im going to get the same size Puffin.
    I did try size XL Swift also while starting that project, and it was way too big. Too high and too long.

  6. #6
    mtbr member
    Reputation: simen's Avatar
    Join Date
    Oct 2004
    Thank you all. I have changed my order to a medium Puffin. There was no problem changing it this early. Other parts are slowly coming in, hopefully everything will be ready till February. I wonder what's going on at the moment with Puffin project?

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