Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-28-09, 03:37 PM   #1
Andy_K 
Senior Member
Thread Starter
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1978 Austro-Daimler, 1987 Pinarello Montello
Posts: 9,149
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 293 Post(s)
Stem angle

I'm buying a new frame and fork, and I want to end up with a fit on the new bike that matches the fit of another bike I own. I wrote a program to calculate the fit (yes, I am a geek) in terms of saddle position, stem length, etc., but I can get the same approximate handlebar position with multiple combinations of headset spacers and stem length and angle.

So here's my question: is there any reason, aside from aesthetics, to choose a relatively high stem position with a small angle over a lower stem position with a steeper offset?

That is, is there a reason to choose something like this:



over something like this:



or vice versa?
Andy_K is offline   Reply With Quote
Old 09-28-09, 03:47 PM   #2
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,109
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 174 Post(s)
Carbon steerers have a maximum recommended spacer stack under the stem. Some maker place the limit at 30 mm and others at 50 mm for 1-1/8" steerers. The limit is almost universal at 25 mm for 1" carbon steerers.

Steel and aluminum steerers aren't as limited but an up-angle stem and a shorter spacer stack should make for a less flexy steering feel.
HillRider is offline   Reply With Quote
Old 09-28-09, 04:07 PM   #3
sooprvylyn
I suck, but you're worse
 
Join Date: Jun 2005
Location: LA
Bikes: Motobecane Fantom Uno-Got rid of the rest when I moved to LA:(
Posts: 672
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You might also find a bit more stem flex(ie hand cushion) with the height taken up in the stem(2nd picture) over the steer tube, especially with a steel steer tube.

However I find downsloping stem to be sexy as hell
sooprvylyn is offline   Reply With Quote
Old 09-28-09, 04:11 PM   #4
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Picture 1 is really ugly and picture 2 is only a little better, since both have big spacers stacks. I like to keep the spacers down to 5-10mm if possible, but I refuse to use a stem angle greater than 84-90. No flipped stems for me. Right now I'm using a 73 degree (horizontal) stem with a 5mm spacer above the 15mm headset top section.

Last edited by DaveSSS; 09-28-09 at 04:47 PM.
DaveSSS is offline   Reply With Quote
Old 09-28-09, 04:17 PM   #5
sooprvylyn
I suck, but you're worse
 
Join Date: Jun 2005
Location: LA
Bikes: Motobecane Fantom Uno-Got rid of the rest when I moved to LA:(
Posts: 672
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I agree with the whole too many spacers thing on the top picture, but I still prefer the downslope look of the stem-looks faster to me, I've always thought the upslope stems looked ********

For the OP- Your a geek right? Whats the shortest distance between two points? Embrace your inner nerd.
sooprvylyn is offline   Reply With Quote
Old 09-28-09, 04:18 PM   #6
sooprvylyn
I suck, but you're worse
 
Join Date: Jun 2005
Location: LA
Bikes: Motobecane Fantom Uno-Got rid of the rest when I moved to LA:(
Posts: 672
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
OMG bike forums just bleeped r e t a r d e d
sooprvylyn is offline   Reply With Quote
Old 09-28-09, 05:03 PM   #7
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,109
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 174 Post(s)
Quote:
Originally Posted by DaveSSS View Post
Picture 1 is really ugly and picture 2 is only a little better, since both have big spacers stacks. I like to keep the spacers down to 5-10mm if possible, but I refuse to use a stem angle greater than 84-90. No flipped stems for me. Right now I'm using a 73 degree (horizontal) stem with a 5mm spacer above the 15mm headset top section.
All of that is just fine IF you have a frame that is large enough and has a head tube extending up enough to get the bars where you want them OR if you are flexible enough to have the bars well below seat level.

Not every one wants or can use the bars as low as a 73 or even a 90 stem plus a very short spacer stack will put them. Looks sometimes have to be sacrificed to practicality.
HillRider is offline   Reply With Quote
Old 09-28-09, 05:46 PM   #8
johnknappcc
Senior Member
 
johnknappcc's Avatar
 
Join Date: Feb 2009
Location: Columbus, OH
Bikes: A beautiful columbus steel frame, 1986 Schwinn Voyageur touring bike, Currently Undergoing Overhaul
Posts: 910
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you're running too many spacers, it's probably a good indication that the frame is a little too small for you.

Other than that, looks have to take a close second to fit.
johnknappcc is offline   Reply With Quote
Old 09-28-09, 05:51 PM   #9
Andy_K 
Senior Member
Thread Starter
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Bikes: 2013 Kona Jake, 2015 Kona Jake the Snake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 2006 Kona Kula, 2012 Ridley Excalibur, 2001 LeMond Buenos Aires, 1984 Pinarello Gran Turismo, 1982 Trek 614, 1978 Austro-Daimler, 1987 Pinarello Montello
Posts: 9,149
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 293 Post(s)
Picture 2 is actually of the bike I'm trying to match. I don't know if I have weird proportions or maybe I have weird preferences, but it seems like bikes that fit me in terms of top tube length and standover don't have the bars as high as I want them without one (or both) of the solutions above.

As it turns out I've actually come to like the up-sloping stem, though I admit at first I thought it looked screwy. It's nice to hear that if will offer additional benefits, however minor.

Thanks to all for the responses.
Andy_K is offline   Reply With Quote
Old 09-28-09, 06:50 PM   #10
norwood
GO BIG RED
 
norwood's Avatar
 
Join Date: Nov 2008
Location: Hastings,NE
Bikes: 1996 Bianchi Veloce 1993 Bridgestone MB-3 1992 Trek 700 1992 Trek 820
Posts: 678
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by DaveSSS View Post
Picture 1 is really ugly and picture 2 is only a little better, since both have big spacers stacks. I like to keep the spacers down to 5-10mm if possible, but I refuse to use a stem angle greater than 84-90. No flipped stems for me. Right now I'm using a 73 degree (horizontal) stem with a 5mm spacer above the 15mm headset top section.
Beauty is in the eye of the beholder. I prefer the setup of the top photo over the up angle of the bottom. That said, I also prefer a custom made one piece spacer instead of all the little short ones stacked up no matter which stem angle is used.
norwood is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 06:06 PM.