Know the rules The Paceline Forum Builder's Spotlight

Go Back   The Paceline Forum > Bike Fit

Thread Tools Display Modes
Old 09-16-2022, 12:17 PM
ucdcrush ucdcrush is offline
Join Date: May 2022
Location: Rancho Cordova, CA
Posts: 37
shin length to set initial saddle height?

I know that saddle height is something best tuned after various trials, a bike fit etc., but..

I stumbled across the Specialized "Bike Sizing App" (which has Retul branding on it) that includes a saddle height recommendation in addition to frame size recommendation.

To my surprise, rather than asking about inseam to provide a starting saddle height recommendation, the App only requested shin length. For what it's worth, my shin length was 40cm and it recommended a starting saddle height of 73.4cm. My inseam is 83.5cm and my height is 176.5cm.

I imagine there is a correlation between shin length and inseam among humans.. so maybe it's essentially equivalent to the app requesting inseam.

But made me wonder, since most of the calculators out there are based on inseam.. is there something special about shin length that might make it a better predictor, at least for a place to start for saddle height? I googled saddle height and shin length, and did not find discussion of a direct relationship.
Reply With Quote
Old 09-16-2022, 06:29 PM
Peter P. Peter P. is offline
Senior Member
Join Date: Mar 2006
Location: Meriden CT
Posts: 6,978
Maybe Specialized found a correlation between shin length and saddle height after measuring thousands of riders. But really; how much can shin length vs. thigh length vary that it becomes THE predictor of saddle height? What next; kneecap diameter?!

And remember; the shin measurement, like all other measurements for saddle height, are just close approximations of what works, and there is some variation around a theoretical ideal that will work just fine.
Reply With Quote
Old 09-16-2022, 06:41 PM
robt57 robt57 is offline
Join Date: Nov 2012
Location: PDX
Posts: 7,686
Ran the app.

It sez saddle height of 74.4 and a 56CM bike.

I guess is has no clue about folk with long femurs and gorilla arms.

Seems inseam should be in this equation to me...

I ride 59-61CM bikes with a 78CM saddle height. I do ride 58CM CX bike and Specialized Road, so not too far off on size...
To me Specialized are only real 58s I have encountered. Most road 58s are 56s I've found.

Maybe I should input 'Other' and not male...

OK, as 'other' I apparently need 1mm lower saddle...
This foot tastes terrible!
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 02:00 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2023, vBulletin Solutions, Inc.