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Bike Fit Riddle

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Bike Fit Riddle

Old 05-11-15, 08:45 AM
  #1  
jambon
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Bike Fit Riddle

Hi ,

Just want to run something by here so that I can be sure I am correct .

I am looking at 2 different sizes of the same bike a Surly Disc Trucker , in 60 cm and 62cm .

The Reach on the 62 is a actually shorter than the reach on the 60 by 2 mill .Reach on the 62 is 401mm Versus 403mm for on the 60 .

The effective toptube on the 60 is 600mm and on the 62 its 610mm .

So What I am assuming , all other measurements aside is that if my saddle position relative to the Bottom bracket (KOPS) is the same on both bikes , with the stem lenght and handlebar height set the same on both bikes , then on the 62 the tip of my saddle will be just 2 mill closer to the bars then on the 60 . Am I missing something ?here are the numbers form the surly site .

Thanks For Reading
J




60cm 62cm
Seat Tube Length
(Center-Top) 600.0 620.0
Top Tube Length
(Center-Center) 594.8 603.9
Effective Top Tube Length
(Center-Center) 600.0 610.0
Head Tube Angle 72.0 72.0
Seat Tube Angle 72.5 72.0
BB Drop 78.0 78.0
Wheelbase 1055.6 1080.3 1085.3
Standover Height 847.8 866.5
Head Tube Length 189.0 210.0
Fork Length 390.0 390.0
Stack 623.2 643.2
Reach 403.0 401.0
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Old 05-11-15, 10:15 AM
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Note that the seat tube angle is half a degree slacker on the 62cm. That, along with a longer seat tube, moves the whole top tube backward slightly, cutting into your reach. 2 mm isn't much either way, so I wouldn't worry about it.
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Old 05-11-15, 01:52 PM
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I thought it had something to do with that seat tube angle . I,m still a bit confused .With my saddle set relative to the BB in the exact same position on both bikes will the distance from the saddle to the bars be the same give or take that 2 mil difference ? Are both bikes the same size in as far as how much Ill need to stretch from my preferred saddle position to reach the bars ?That's waht I'm trying to figure out .

Last edited by jambon; 05-11-15 at 01:55 PM.
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Old 05-11-15, 05:00 PM
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I think so. The saddle would end up a little further forward in the clamp to achieve the same position wrt the BB. It's certainly something that could be adjusted around easily.
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Old 05-12-15, 06:18 AM
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Thanks for your help , Im pretty sure that's how it will be too . Just wanted to double check before ordering .
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