Go Back  Bike Forums > Bike Forums > Singlespeed & Fixed Gear
Reload this Page >

Are 31.8 bars stiffer than 25.4?

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

Are 31.8 bars stiffer than 25.4?

Old 12-01-16, 09:48 AM
  #1  
nightfly
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 1,224
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Are 31.8 bars stiffer than 25.4?

Just wondering. Running some Easton 25.4 risers in a quill stem and they are a bit flexy. Would getting one of those fancy Factory Five 31.8 quills and switching to 31.8 risers would result in any meaningful increase in stiffness. Been running wider bars so more leverage. Never had any problems when I was running narrower bars.
nightfly is offline  
Old 12-01-16, 09:56 AM
  #2  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
A handlebar having a larger center will be stiffer. However, if they're clamped in a stem that flexes like al dente linguine you'll just be trading one problem for another.

A friend of mine who is a pretty big guy got one of those stems and clamped his Thomson risers in it. When he showed me how insane the side-to-side flex was when pushing on one side of the bars, then the other, we agreed that he should stop using it. I drew a line on the side of the extension and could literally see it twisting.

Last edited by Scrodzilla; 12-01-16 at 10:34 AM.
Scrodzilla is offline  
Old 12-01-16, 09:59 AM
  #3  
nightfly
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 1,224
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Are the Factory Five Stems particularly flexy or is this just inherent in quill stem design?
nightfly is offline  
Old 12-01-16, 10:06 AM
  #4  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Any aluminum quill stem will flex more than a threadless setup. Those F5 stems (at least the one I've seen up close) are especially flexy, especially with wide, stiff risers clamped in them and a big dude yanking them back & forth.

I like Factory Five stuff, but wouldn't use that stem. You seem to really want one though, so give it a try. If you don't like it, the universe will continue to operate as it does.

Last edited by Scrodzilla; 12-01-16 at 10:10 AM.
Scrodzilla is offline  
Old 12-01-16, 10:07 AM
  #5  
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: 6832 Post(s)
Likes: 0
Liked 211 Times in 176 Posts
IDK "factory 5" is probably just a brand name.. made in a multi-logo applying factory.

I've never heard of them, supply more info. [& its not my question so I go, Meh, don't worry about it]

consider a Chromoly steel stem if you want more flex resistance..






...

Last edited by fietsbob; 12-01-16 at 10:13 AM.
fietsbob is offline  
Old 12-01-16, 10:09 AM
  #6  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Because Google is hard to use:

https://wearefactoryfive.com
Scrodzilla is offline  
Old 12-01-16, 10:16 AM
  #7  
franswa
Senior Member
 
franswa's Avatar
 
Join Date: Jul 2014
Location: SATX
Posts: 1,596
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm thinking it has to do with the physics of having a disproportionately larger bar clamp area and a relatively slender shaft.
franswa is offline  
Old 12-01-16, 10:19 AM
  #8  
nightfly
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 1,224
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Thanks for the info. Not especially interested in dropping the cash but certainly don't want to do it and not solve the problem. Rather live with it with no expenditure and keep the old EA 50s and and MJ Quill. Or money better spent on switching to threadless fork (Soma Rush can take either) and doing it right. Appreciate the info.
nightfly is offline  
Old 12-01-16, 10:24 AM
  #9  
franswa
Senior Member
 
franswa's Avatar
 
Join Date: Jul 2014
Location: SATX
Posts: 1,596
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by nightfly View Post
Thanks for the info. Not especially interested in dropping the cash but certainly don't want to do it and not solve the problem. Rather live with it with no expenditure and keep the old EA 50s and and MJ Quill. Or money better spent on switching to threadless fork (Soma Rush can take either) and doing it right. Appreciate the info.
Here is another option to consider:

https://www.retro-gression.com/colle...1-8-quill-stem
franswa is offline  
Old 12-01-16, 10:32 AM
  #10  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That Nitto 31.8 quill stem is very stiff, but most people are turned off by how ugly it is.
Scrodzilla is offline  
Old 12-01-16, 10:42 AM
  #11  
nightfly
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 1,224
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Yup. Count me among the turned off. Must have been Nitto's industrial designer's day off.

So is the flex due to extension part of the stem or the quill part?

Other route would be just a stiff 25.4 quill if that's not impossible due to science. Is something like a Nitto Pearl stiffer?

Originally Posted by Scrodzilla View Post
That Nitto 31.8 quill stem is very stiff, but most people are turned off by how ugly it is.

Last edited by nightfly; 12-01-16 at 10:49 AM.
nightfly is offline  
Old 12-01-16, 11:09 AM
  #12  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by nightfly View Post
So is the flex due to extension part of the stem or the quill part?
A little bit of both. Just looking at the construction of a threadless stem and how it clamps to the steerer, you can tell it will be stiffer than a quill.

The vintage Cinelli 1A on my Raleigh is a bit Noodly too, but I've got narrow drops on it and it's not really a problem. In my experience the newer 1A and Pearl are pretty solid quill stems. As with anything, there's a wide range of answers for your original question of whether or not OS bars are stiffer than those having a 25.4 or 26mm clamp area. There are crappy bars and there are good bars.

Last edited by Scrodzilla; 12-01-16 at 11:17 AM.
Scrodzilla is offline  
Old 12-01-16, 11:47 AM
  #13  
Altimis
Senior Member
 
Altimis's Avatar
 
Join Date: Jul 2016
Posts: 200
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This issue only on Riser bar or all type of 25.4mm?

Because seems like you guys only talking about Riser bar, not mentions other bar
Altimis is offline  
Old 12-01-16, 12:08 PM
  #14  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
He specifically asked about risers, so that's what we're talking about. Crazy, I know.
Scrodzilla is offline  
Old 12-01-16, 04:37 PM
  #15  
nightfly
Senior Member
Thread Starter
 
Join Date: Feb 2005
Posts: 1,224
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Any thoughts on Easton EA 50 25.4 bars. Wondering where they fall on the spectrum of crappy to good. Would be happy to just replace either the stem or the bars to get some more stiffness. Nitto Pearl for a stem or the Nitto 809aa bars. Picked up the Easton's on ebay cheap. Getting harder to find 25.4 bars.

Originally Posted by Scrodzilla View Post
As with anything, there's a wide range of answers for your original question of whether or not OS bars are stiffer than those having a 25.4 or 26mm clamp area. There are crappy bars and there are good bars.
nightfly is offline  
Old 12-01-16, 06:11 PM
  #16  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Not sure about the Eastons but the B809AA is pretty awesome. I've use them on my Bare Knuckle from time to time and love those bars.
Scrodzilla is offline  
Old 12-01-16, 11:13 PM
  #17  
acoustophile
Senior Member
 
acoustophile's Avatar
 
Join Date: Jun 2008
Location: Calgary
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
tl:dr: quill stems will always flex more than threadless regardless of bar clamp size.
acoustophile is offline  
Old 12-01-16, 11:15 PM
  #18  
acoustophile
Senior Member
 
acoustophile's Avatar
 
Join Date: Jun 2008
Location: Calgary
Posts: 106
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
also, 31.8 vs 25.4 vs 22.2 /whatever is all relative.

eg. a steel 22.2 bar will be just as strong as a larger aluminum bar size
acoustophile is offline  
Old 12-01-16, 11:41 PM
  #19  
wgscott
Occam's Rotor
 
wgscott's Avatar
 
Join Date: Jul 2013
Location: The Timbers of Fennario (CL77)
Posts: 4,897

Bikes: Steel

Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 209 Times in 129 Posts
What about something like this?

wgscott is offline  
Old 12-01-16, 11:43 PM
  #20  
wgscott
Occam's Rotor
 
wgscott's Avatar
 
Join Date: Jul 2013
Location: The Timbers of Fennario (CL77)
Posts: 4,897

Bikes: Steel

Mentioned: 61 Post(s)
Tagged: 0 Thread(s)
Quoted: 2366 Post(s)
Liked 209 Times in 129 Posts
Also: http://www.bikeforums.net/classic-vi...der-bikes.html
wgscott is offline  
Old 12-02-16, 10:23 AM
  #21  
Scottybigs
Senior Member
 
Scottybigs's Avatar
 
Join Date: Jan 2015
Location: Toronto
Posts: 253

Bikes: Schwinn Voyageur SP | Sekine SHS-271 | Wabi Special

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 107 Post(s)
Liked 0 Times in 0 Posts
As others have noted, if you consider exerting force+flex on an 1-inch diameter aluminum quill stem vs. a 1-1/8 inch diameter chromoly steel steerer tube, you'll certainly notice the quill being softer (at least in the stem extension area).

This only really matters to me when riding fixed, as the riding style requires additional torque on many areas of the bike. On a geared road bike, I really don't mind quill's as much, and actually prefer the aesthetic.

You might also consider the VO Chromoly Steel stem, which is sooo purdy.
Scottybigs is offline  
Old 12-04-16, 02:43 PM
  #22  
thehammerdog
Senior Member
 
thehammerdog's Avatar
 
Join Date: Dec 2007
Location: NWNJ
Posts: 2,635

Bikes: Road bike is a Carbon Bianchi C2C & Grandis (1980's), Gary Fisher Mt Bike, Trek Tandem & Mongoose SS MTB circa 1992.

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 211 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Originally Posted by nightfly View Post
Just wondering. Running some Easton 25.4 risers in a quill stem and they are a bit flexy. Would getting one of those fancy Factory Five 31.8 quills and switching to 31.8 risers would result in any meaningful increase in stiffness. Been running wider bars so more leverage. Never had any problems when I was running narrower bars.
Yes...
thehammerdog is offline  
Old 12-04-16, 03:28 PM
  #23  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by thehammerdog View Post
Yes...
Maybe you should've read the thread.
Scrodzilla is offline  
Old 12-04-16, 06:40 PM
  #24  
Nagrom_
Fixie Infamous
 
Nagrom_'s Avatar
 
Join Date: Dec 2011
Location: SF
Posts: 10,474

Bikes: 2007 CAAD Optimo Track, 2012 Cannondale CAAD10, 1996 GT Force restomod, 2015 Cannondale CAADX

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This is why threadless was invented.
Nagrom_ is offline  
Old 12-04-16, 09:49 PM
  #25  
Scrodzilla
See you in Hell.
 
Scrodzilla's Avatar
 
Join Date: May 2009
Location: South of Heaven
Posts: 25,949

Bikes: EAI Bare Knuckle

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 573 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Nagrom_ View Post
This is why threadless was invented.
I lol'ed.
Scrodzilla is offline  

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.