Go Back  Bike Forums > Bike Forums > Fitting Your Bike
Reload this Page >

Best sitbone measurement done at home

Fitting Your Bike Are you confused about how you should fit a bike to your particular body dimensions? Have you been reading, found the terms Merxx or French Fit, and don’t know what you need? Every style of riding is different- in how you fit the bike to you, and the sizing of the bike itself. It’s more than just measuring your height, reach and inseam. With the help of Bike Fitting, you’ll be able to find the right fit for your frame size, style of riding, and your particular dimensions. Here ya’ go…..the location for everything fit related.

Best sitbone measurement done at home

Old 05-08-19, 08:19 PM
  #1  
acorn54
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 351
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Best sitbone measurement done at home

while experimenting sizing my sit bones for a brooks on my bike, i came up with an idea that i'll pass along. the image one gets is remarkably similar to what i have seen
on the internet in x-ray images.:

light coat shaving foam on toilet seat cover

without undergarments on, of course sit on shaving foam.

the resultant image easily defines the sit bone structure for you to measure.
acorn54 is offline  
Old 05-08-19, 09:53 PM
  #2  
texbiker
Senior Member
 
texbiker's Avatar
 
Join Date: Jan 2012
Location: Kingwood, TX
Posts: 753

Bikes: Canyon Endurace CF SLX, Blue Norcorss AL,

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 33 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Years ago I wrote this on my blog:
Saddles are a very personal fit item. If you are like me this is probably the bicyclist’s equivalent of the search for the Holy Grail. To me the important part is getting the seat cushion part to line up with my sit-bones. How do you do this? My thought is to take a piece of rather soft styrofoam about 3/4″ thick as a template to capture your sit-bone size, position and width. Here is how to do it:

* place the foam on a hard surface where you can sit as you would on your bike
* sit on the foam, being sure to make the sit-bones produce an impression into the foam
* now you can get fancy if you like, make a plaster-of-Paris casting of the impression
* take this casting or sheet of foam with you when inspecting saddles at your bike shop to compare your position versus the saddle positions.
texbiker is offline  
Old 05-08-19, 10:32 PM
  #3  
Bmach
Senior Member
 
Join Date: Nov 2013
Posts: 666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 274 Post(s)
Liked 13 Times in 10 Posts
You are making it to complex. Just go to a bike shop and have them measure it. When you decide on a correctly fitted saddle ride it for a couple of hundred miles let your butt get used to it. I think to many people do not give their body time to adjust the a saddle before changing it out for another. Then the body has to adjust to another saddle and the cycle starts all over again. Just 2 cents worth.
Bmach is offline  
Old 05-09-19, 05:29 AM
  #4  
kingston 
Jedi Master
 
kingston's Avatar
 
Join Date: Sep 2014
Location: Lake Forest, IL
Posts: 2,637

Bikes: http://stinkston.blogspot.com/p/my-bikes.html

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1078 Post(s)
Liked 18 Times in 15 Posts
What do you do with the sit bone measurements when you have them? I have never measured my sit bones, but I have ridden a lot of different saddles and have not personally observed much correlation between saddle width and comfort.
kingston is offline  
Old 05-09-19, 06:57 AM
  #5  
USN
Junior Member
 
Join Date: Apr 2019
Location: Chattanooga,tn
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i just bought a foam cover at walmart and bought the riding shorts with the foam in them, Im good.
USN is offline  
Old 05-09-19, 11:01 AM
  #6  
Iride01
Senior Member
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 2,311

Bikes: '91 Schwinn Paramount '78 Raleigh Competition GS

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 856 Post(s)
Liked 25 Times in 22 Posts
Originally Posted by USN View Post
i just bought a foam cover at walmart and bought the riding shorts with the foam in them, Im good.
Let us know how that works after a four hour ride. If you are only doing a 20 minute ride, I'm sure it's quite comfy.

Oh.... welcome to the forums. You gotta take the flak... It's forum life.
Iride01 is offline  
Old 05-09-19, 11:18 AM
  #7  
Carbonfiberboy 
just another gosling
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Posts: 14,957

Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004

Mentioned: 86 Post(s)
Tagged: 0 Thread(s)
Quoted: 1785 Post(s)
Liked 34 Times in 28 Posts
I too have noticed little correlation between measurement and published saddle width. But for sure, don't get too narrow a saddle. I don't know the formula but it's probably something like add 40mm to measured width.
__________________
Results matter
Carbonfiberboy is online now  
Old 05-09-19, 12:22 PM
  #8  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 214 Times in 178 Posts
sheet of foam core and a wooden chair? lay down the foam core-paper piece and sit on it. ?
fietsbob is offline  
Old 05-09-19, 09:36 PM
  #9  
Loose Chain
Senior Member
 
Loose Chain's Avatar
 
Join Date: Sep 2009
Location: USA
Posts: 1,934

Bikes: 84 Pinarello Trevisio, 86 Guerciotti SLX, 96 Specialized Stumpjumper, 2010 Surly Cross Check, 88 Centurion Prestige, 73 Raleigh Sports, GT Force, Bridgestone MB4

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 215 Post(s)
Liked 17 Times in 14 Posts
Originally Posted by USN View Post
i just bought a foam cover at walmart and bought the riding shorts with the foam in them, Im good.
No, actually, not being mean, you are not good. Piling foam on foam is not going to be comfortable. Just the opposite.

I have sat on the newspaper in my Speedo (or sans Speedo as the case might be) and gotten my sit bone number. I purchased my Specialized (Avatar) saddles using that number and am very pleased with the results. I have a somewhat wider than average (for a male) sit bone width, fairly wide. No, I am not fat, 5-10+, 29 inch waist and 154 pounds. The point being for many perhaps it does not matter but for a person who is outside of the norm for their gender, it could make a big difference.

Last edited by Loose Chain; 05-09-19 at 09:40 PM.
Loose Chain is offline  
Old 05-10-19, 01:38 PM
  #10  
Clem von Jones
Senior Member
 
Join Date: Sep 2008
Posts: 585
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 91 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Fill a large 1 or 2 gallon ziplock baggie with enough flour to make a thin flour mat after you evacuate all the air from the bag. Place it on a toilet lid and sit down slowly and carefully whilst bending forward into an aero posture. You should get two very distinct points where the bones jut out.
Clem von Jones is offline  
Old 05-10-19, 03:58 PM
  #11  
Iride01
Senior Member
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 2,311

Bikes: '91 Schwinn Paramount '78 Raleigh Competition GS

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 856 Post(s)
Liked 25 Times in 22 Posts
Talking

Maybe someone should sell some casting kits tailor made for getting an impression of our butt. We could then take the mold and make an actual casting of our buts. Then we could take them with us to the LBS and see with our own eyes how we fit to a potential new purchase. <grin>

Not certain if I'm serious or jesting. Maybe both.
Iride01 is offline  
Old 05-10-19, 05:57 PM
  #12  
The_Joe
Senior Member
 
Join Date: Aug 2012
Location: Philadelphia, PA
Posts: 351
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I've used aluminum foil and a semi-firm cushion (ottoman or wide couch arm) with good results. Checked against measurements from an actual site bone measuring device it all matched up.
The_Joe is offline  
Old 05-15-19, 09:21 AM
  #13  
trailangel
Senior Member
 
trailangel's Avatar
 
Join Date: Feb 2014
Location: Pasadena, CA
Posts: 3,631

Bikes: Schwinn Varsity

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1263 Post(s)
Liked 45 Times in 31 Posts
My mom always does the measuring for me.
trailangel is offline  
Old 05-20-19, 12:55 PM
  #14  
USN
Junior Member
 
Join Date: Apr 2019
Location: Chattanooga,tn
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Short rides only, maybe 2 to 10 miles with some rest stops, yep my bottom is ok,,,no long rides for us, mostly weekend warriors, simple stuff..
USN is offline  
Old 07-03-19, 04:20 PM
  #15  
berner
Senior Member
 
Join Date: May 2010
Location: Bristol, R. I.
Posts: 3,430

Bikes: Specialized Secteur, old Peugeot

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 299 Post(s)
Liked 31 Times in 25 Posts
If your home printer has a copy function make the copy of your butt. Just don't post here. On the other hand, it you are kinky, think of the image as wall art.
berner is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Chitown_Mike
Clydesdales/Athenas (200+ lb / 91+ kg)
12
10-24-12 08:55 PM
caloso
Road Cycling
20
02-14-09 07:32 AM
stapfam
Fifty Plus (50+)
13
07-12-07 09:50 PM
Mayonnaise
Singlespeed & Fixed Gear
4
09-22-04 02:42 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.