How do you determine frame sz. these days?
10-23-07 | 08:54 AM
#1
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How do you determine frame sz. these days?
How do you determine proper frame size these days given the sloping top tubes of most bikes? Are the old formulas of .65 x inseam for c-c and .67 x inseam for c-t in any way relevant?
My inseam is about 86 cm and I've been sized on anything from 53cm to 56 cm. I know that there's a range of frame sizes most people fit, but is there a formula used now days for the sloping TT? Thanks.
My inseam is about 86 cm and I've been sized on anything from 53cm to 56 cm. I know that there's a range of frame sizes most people fit, but is there a formula used now days for the sloping TT? Thanks.
10-23-07 | 09:15 AM
#2
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Bikes: Pedal Force RS, Serotta "Atlanta", Gitane "Tour de France", (2) Specialized "Stumpjumper", Trek "950"
There are a number of online calculators that get you in the ball park. I like competitivecyclist the best because it calculates three different fit styles.
https://www.competitivecyclist.com/za/CCY?PAGE=HOME
https://www.wrenchscience.com/Store.aspx?stylecode=R
https://www.peterwhitecycles.com/fitting.htm
https://bikefitkit.com/bicycle_riders...t_position.php
https://www.competitivecyclist.com/za/CCY?PAGE=HOME
https://www.wrenchscience.com/Store.aspx?stylecode=R
https://www.peterwhitecycles.com/fitting.htm
https://bikefitkit.com/bicycle_riders...t_position.php
10-23-07 | 09:21 AM
#3
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Bikes: 1994 Bridgestone RB1, 2006 Cannondale R1000, 2007 Cannondale Caad9 Optimo2
They use the virtual top tube size when determining the correct size on a sloping/compact frame.
Check this out https://www.litespeed.com/bikes/2005/sizing.aspx
Wow an 86 inseam and they put you on a 56?
If your 6ft+ I'd think a 56 would be the smallest.
Just how tall are you?
Check this out https://www.litespeed.com/bikes/2005/sizing.aspx
Wow an 86 inseam and they put you on a 56?
If your 6ft+ I'd think a 56 would be the smallest.
Just how tall are you?
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Last edited by PhilThee; 10-23-07 at 12:39 PM.
10-23-07 | 09:29 AM
#4
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I think it showed a bit more info before.Seems like it's geared more tward a sale now.
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10-23-07 | 09:53 AM
#5
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Most important measure is virtual top tube length, that's what drives most of the fit. You can move the seat up and down, but you can't cut or stretch the top tube... There is a bit of play with stem length, but not that much.
Second important sizing point is head tube length, in terms of how low/high the bars can be set relative to seat position.
I did my last frame selection based entirely on TT length; I came up with different sizes from different manufacturers, so don't stick on a frame size number.
Second important sizing point is head tube length, in terms of how low/high the bars can be set relative to seat position.
I did my last frame selection based entirely on TT length; I came up with different sizes from different manufacturers, so don't stick on a frame size number.
10-24-07 | 07:22 AM
#8
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10-24-07 | 07:39 AM
#9
pan y agua
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Bikes: Willier Zero 7; Merlin Extralight; Calfee Dragonfly tandem, Calfee Adventure tandem; Cervelo P2; Motebecane Ti Fly 29er; Motebecanne Phantom Cross; Schwinn Paramount Track bike
^ It's the length that gives you the right extension to the bars, using a reasonably sized stem.
10-24-07 | 11:11 AM
#10
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https://www.competitivecyclist.com/za...LCULATOR_INTRO
https://www.wrenchscience.com/Login....=R&stylecode=R
With the wrench science one you have to join to get the info.It wasn't like that before.
You need to follow those links provided and fill out the forms.
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"I didn't see him/her" is a confession, not an excuse.
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10-24-07 | 01:48 PM
#11
my nice bike is at home
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Bikes: 2011 BMC Race Machine / 2012 BMC Road Machine / Trek 2300 / '90's Merlin/ '70's Raleigh 20/ Ti-'swift' folder / Erickson w/S&S couplers
It is a good question with no solid answer....
