Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Average Male Inseam to Height Ratio?

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Average Male Inseam to Height Ratio?

Old 03-20-07, 08:44 PM
  #1  
MIN 
big ring
Thread Starter
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Posts: 5,838
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Average Male Inseam-to-Height Ratio?

Does anyone know what the average male inseam-to-height ratio is?
Do manufactures set geometry with this proportion in mind?

My measurements:

70" (177.8cm) Height
32.25" (82cm) Inseam
-------------
46.1% Inseam to Heigh Ratio

I want to know - relative to the male norm for my height - is this short legged or long legged?

Based on the answer to above, which company's geometry would suit me? (Example: I know Lemond is good for relative short legged riders, but I'm not sure what that is, quantifiably.)

Last edited by MIN; 03-20-07 at 08:48 PM. Reason: grammar
MIN is offline  
Old 03-20-07, 08:48 PM
  #2  
5Biker
Junior Member
 
Join Date: Mar 2007
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
FWIW;
height 72"
inseam 34"

47.2%
5Biker is offline  
Old 03-20-07, 08:51 PM
  #3  
ILUVUK
en fuego
 
ILUVUK's Avatar
 
Join Date: Jan 2007
Location: Davenport, IA
Posts: 2,685

Bikes: Trek Madone 3.1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
height - 69 inches
inseam - 31 inches

44.9%
ILUVUK is offline  
Old 03-20-07, 08:53 PM
  #4  
531Aussie
Aluminium Crusader :-)
 
Join Date: Apr 2004
Location: Melbourne, Australia
Posts: 10,048
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked 5 Times in 4 Posts
there's an old thread about this with several measurements

https://www.bikeforums.net/showthread...ghlight=inseam

there are others, too, if you wanna search

I'm 182cm with an 89.5cm inseam

NOT PANTS INSEAM!!

Some of you Yanks seem to get pants inseam and real inseam mixed up
531Aussie is offline  
Old 03-20-07, 09:03 PM
  #5  
MIN 
big ring
Thread Starter
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Posts: 5,838
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Thanks for that link.

However, I wanted to know if there was a more authoratative source than individual contributions. Individual responses are nothing but statistical noise. It would be useful, though, to know what the aggregate view is. Hence my post.
MIN is offline  
Old 03-20-07, 09:04 PM
  #6  
Reynolds 
Passista
 
Reynolds's Avatar
 
Join Date: Jul 2005
Posts: 7,355

Bikes: 1998 Pinarello Asolo, 1992 KHS Montaña pro, 1980 Raleigh DL-1, IGH Hybrid, IGH Utility

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 787 Post(s)
Liked 485 Times in 276 Posts
Height = 173 cm
Inseam = 83.5 cm
48.3 %
Reynolds is offline  
Old 03-20-07, 09:10 PM
  #7  
MIN 
big ring
Thread Starter
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Posts: 5,838
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time in 1 Post
OK - again, I'm not soliciting your measurements. There are many other threads along those lines.
MIN is offline  
Old 03-20-07, 09:11 PM
  #8  
FrankBattle 
SilentRider
 
FrankBattle's Avatar
 
Join Date: Aug 2004
Location: Taiwan
Posts: 2,381

Bikes: Giant TCR Advanced Pro, Trek Domane SLR, Trek Emonda SLR Project One, custom Bingham Built Titanium road bike, custom TYA steel (Taiwan brand), Breezer Venturi, custom Badger Cycles road bike (no longer in business), + a host of other frames

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
but why?

There are so many other aspects to bike fitting. Throw this measurement away if you are after a good fit. Invest in a $75+ professional fitting at your [recommended] LBS and go from there.

Bike companies may well do this, but I have never heard of it.
FrankBattle is offline  
Old 03-20-07, 09:19 PM
  #9  
MIN 
big ring
Thread Starter
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Posts: 5,838
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by FrankBattle
but why?

There are so many other aspects to bike fitting. Throw this measurement away if you are after a good fit. Invest in a $75+ professional fitting at your [recommended] LBS and go from there.

Bike companies may well do this, but I have never heard of it.

I realize there are other aspects to fitting however no LBSs that I know of offers a good fitting. It's mostly intellectual ************ - plus I'm curious.

I already know the tight window as to my size. Mostly, I'd like to know the tendency of manufacturers to cater to certain proporations (as in the Lemond example I used earlier.)
MIN is offline  
Old 03-20-07, 09:19 PM
  #10  
Blopslee
Senior Member
 
Blopslee's Avatar
 
Join Date: Aug 2006
Location: Chicago
Posts: 73

Bikes: n+1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
check out the charts at the bottom - seems he's had years of experience

https://www.prodigalchild.net/Bicycle6.htm
Blopslee is offline  
Old 03-20-07, 09:26 PM
  #11  
FrankBattle 
SilentRider
 
FrankBattle's Avatar
 
Join Date: Aug 2004
Location: Taiwan
Posts: 2,381

Bikes: Giant TCR Advanced Pro, Trek Domane SLR, Trek Emonda SLR Project One, custom Bingham Built Titanium road bike, custom TYA steel (Taiwan brand), Breezer Venturi, custom Badger Cycles road bike (no longer in business), + a host of other frames

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by MIN
I realize there are other aspects to fitting however no LBSs that I know of offers a good fitting. It's mostly intellectual ************ - plus I'm curious.

I already know the tight window as to my size. Mostly, I'd like to know the tendency of manufacturers to cater to certain proporations (as in the Lemond example I used earlier.)
Ah yeah. I understand intellectual curiousity. Stab in the dark here, but you could just try emailing the technical departments of whichever bike company you are interested in .. Worst possible answer is "no." No?
FrankBattle is offline  
Old 03-20-07, 09:29 PM
  #12  
MIN 
big ring
Thread Starter
 
MIN's Avatar
 
Join Date: Mar 2007
Location: philadelphia
Posts: 5,838
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Blopslee
check out the charts at the bottom - seems he's had years of experience

https://www.prodigalchild.net/Bicycle6.htm
Interesting insight from that link:

The way I determine frame size is to start by saying this equals two-thirds of the rider’s inseam. (This is a starting assumption, other factors need to be taken into consideration.) This means that for the taller the rider, the amount of seat post showing out of the frame increases progressively. The resulting difference in the handlebar to seat height ratio accommodates the taller rider’s longer arm length. The handlebar stem also increases in length for a larger frame. The top tube length on larger frames increases at a lesser rate, because the upper body length increases at a lesser rate.

Originally Posted by FrankBattle
Ah yeah. I understand intellectual curiousity. Stab in the dark here, but you could just try emailing the technical departments of whichever bike company you are interested in .. Worst possible answer is "no." No?
Because you guys respond quicker. Isn't that the purpose of an Internet forum? To share ideas and filter out the sh1t?

Last edited by MIN; 03-20-07 at 09:36 PM.
MIN is offline  
Old 03-20-07, 09:43 PM
  #13  
Blopslee
Senior Member
 
Blopslee's Avatar
 
Join Date: Aug 2006
Location: Chicago
Posts: 73

Bikes: n+1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
[QUOTE=MIN]Interesting insight from that link:

[I]The way I determine frame size is to start by saying this equals two-thirds of the rider’s inseam.

I think things were thought to be a little more clear before sloping top tubes.
Blopslee is offline  
Old 03-20-07, 09:52 PM
  #14  
biffstephens
Biker looking for a ride!
 
Join Date: Nov 2006
Location: Edmond Oklahoma
Posts: 1,480

Bikes: Kuota Kreedo...looking for something different.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Height 188 cm
crotch 84 cm
trunk 73 cm
arm 79 cm

44.68 %
biffstephens is offline  
Old 03-20-07, 11:10 PM
  #15  
glenng
Master Surfer of Curbs
 
glenng's Avatar
 
Join Date: Feb 2007
Location: 70%PIT 30% Blue Yonder
Posts: 138

Bikes: Whats it to ya?

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by 5Biker
FWIW;
height 72"
inseam 34"

47.2%
+1
glenng is offline  
Old 03-20-07, 11:31 PM
  #16  
grebletie
NorCal Climbing Freak
 
Join Date: Feb 2006
Posts: 872
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
height 68 inches
inseam 33.5 inches

49.2%

lots of leg there.
grebletie is offline  
Old 03-21-07, 12:25 AM
  #17  
terrymorse 
climber has-been
 
terrymorse's Avatar
 
Join Date: Dec 2004
Location: Palo Alto, CA
Posts: 4,272

Bikes: Scott Addict R1

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 938 Post(s)
Liked 772 Times in 425 Posts
Originally Posted by grebletie
height 68 inches
inseam 33.5 inches

49.2%

lots of leg there.
Height: 71"
Inseam: 35"

49.3%

Twins separated at birth?
__________________
Ride, Rest, Repeat
terrymorse is offline  
Old 03-21-07, 04:02 AM
  #18  
bruce19
Senior Member
 
bruce19's Avatar
 
Join Date: Jul 2006
Location: Lebanon (Liberty Hill), CT
Posts: 8,118

Bikes: CAAD 12, MASI Gran Criterium S, Colnago World Cup CX & Guru steel

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1588 Post(s)
Liked 1,048 Times in 614 Posts
Originally Posted by MIN
Does anyone know what the average male inseam-to-height ratio is?
Do manufactures set geometry with this proportion in mind?

My measurements:

70" (177.8cm) Height
32.25" (82cm) Inseam
-------------
46.1% Inseam to Heigh Ratio

I want to know - relative to the male norm for my height - is this short legged or long legged?

Based on the answer to above, which company's geometry would suit me? (Example: I know Lemond is good for relative short legged riders, but I'm not sure what that is, quantifiably.)
Those are exactly my measurements. And, I mean exactly. I've found that I can fit nicely on frame sizes from 54-56 c to c for general recreational road riding.
bruce19 is offline  
Old 03-21-07, 04:26 AM
  #19  
FrankBattle 
SilentRider
 
FrankBattle's Avatar
 
Join Date: Aug 2004
Location: Taiwan
Posts: 2,381

Bikes: Giant TCR Advanced Pro, Trek Domane SLR, Trek Emonda SLR Project One, custom Bingham Built Titanium road bike, custom TYA steel (Taiwan brand), Breezer Venturi, custom Badger Cycles road bike (no longer in business), + a host of other frames

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by MIN
Because you guys respond quicker. Isn't that the purpose of an Internet forum? To share ideas and filter out the sh1t?
Depends on the topic.

You asked a specific question (relating height/inseam with frame size) to which you will get a myriad of answers since not everyone is riding the right fit bike. To get a specific (or reliable) answer, you need more than forum answers. Besides, people probably lie about their inseams and/or height. Imagine that.
FrankBattle is offline  
Old 03-21-07, 04:35 AM
  #20  
branman1986
Eternal Cat3 Rookie
 
branman1986's Avatar
 
Join Date: Jul 2006
Location: Atlanta, GA
Posts: 1,167

Bikes: 2004 Giant TCR2 Composite & 2006 Fuji Touring

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
why would people lie about their inseams and height?
branman1986 is offline  
Old 03-21-07, 04:53 AM
  #21  
biker7
Senior Member
 
biker7's Avatar
 
Join Date: Feb 2005
Posts: 2,850
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Don't know if you have a background in statistics or not. Bottom line is inseam length (independent of height) still dominates for the vast bell curve of cyclists out there. There is a correlation however. Dave Moulton's chart is derived by thousands of fittings and he is a pre-eminent expert on the subject. So is Sheldon Brown. Both subscribe to the 2/3 X's cycling inseam for frame size. I do too. Statistically most (not all) derive their height in their legs. Tall people many times have pedestrian length torsos. This applies to Sheldon Brown and myself and countless others. As a result, bicycles are designed to grow vertically almost 2:1 versus horizontally in frame size. This is not happenstance but based statistically on a normal distribution of height to inseam ratio. The reason that seat tube length or now virtual seat tube length with the advent of sloped top tube geometry bikes predominates is because virtual or actual seat post length dictates head tube length. In the grand scheme it is the ratio of seat post to head tube length that matter for saddle to handlebar drop. The other prevailing factor is top tube length and again, top tube does not increase nearly as must as seat post and head tube length between frame sizes which agrees with the statistical norm that torso size does not change nearly as much as inseam for different size people.
HTH,
George
biker7 is offline  
Old 03-21-07, 04:58 AM
  #22  
branman1986
Eternal Cat3 Rookie
 
branman1986's Avatar
 
Join Date: Jul 2006
Location: Atlanta, GA
Posts: 1,167

Bikes: 2004 Giant TCR2 Composite & 2006 Fuji Touring

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm tall and my inseam is 50% of total height, seems to reflect what George said.
branman1986 is offline  
Old 03-21-07, 05:10 AM
  #23  
FrankBattle 
SilentRider
 
FrankBattle's Avatar
 
Join Date: Aug 2004
Location: Taiwan
Posts: 2,381

Bikes: Giant TCR Advanced Pro, Trek Domane SLR, Trek Emonda SLR Project One, custom Bingham Built Titanium road bike, custom TYA steel (Taiwan brand), Breezer Venturi, custom Badger Cycles road bike (no longer in business), + a host of other frames

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by branman1986
why would people lie about their inseams and height?
This is a rhetorical question, right?
FrankBattle is offline  
Old 03-21-07, 11:07 AM
  #24  
grebletie
NorCal Climbing Freak
 
Join Date: Feb 2006
Posts: 872
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by FrankBattle
This is a rhetorical question, right?
I'd be interested to know why someone would lie about their inseam. Correct inseam measurement is integral to a good fit. Why fudge the numbers, and thus the fit?
grebletie is offline  
Old 03-21-07, 11:31 AM
  #25  
badger1
Senior Member
 
badger1's Avatar
 
Join Date: Oct 2005
Location: Southwestern Ontario
Posts: 4,609
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1264 Post(s)
Liked 552 Times in 310 Posts
Here's the ratio I recall reading a while back in something by a sports doc (it was cycling-related): for males, dividing total height by true (cycling) inseam (bare feet/floor to pubic bone) will typically give a number somewhere between 2 and 2.2. 2 is long legs, 2.2 short (both relative to total height). My case: 174.5 t/h, 84 cm inseam gives 2.07, so tending slightly toward 'long legs for height/short torso.'
badger1 is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.