Know the rules The Paceline Forum Builder's Spotlight


Go Back   The Paceline Forum > Bike Fit

Reply
 
Thread Tools Display Modes
  #1  
Old 04-28-2020, 10:05 PM
ANAO's Avatar
ANAO ANAO is offline
Category VI
 
Join Date: Jun 2013
Location: T-Neck (Dirty Jerzee)
Posts: 2,504
How does a compact geometry affect fit?

I've been wondering something.

With all else being equal, how does a compact geometry differ from a standard geometry specifically as it relates to the rider's fit and relationship to the machine?

Sent from my SM-G960U using Tapatalk
__________________
-eli
---
The Duke of Milford
Reply With Quote
  #2  
Old 04-29-2020, 01:06 AM
mhespenheide mhespenheide is offline
Senior Member
 
Join Date: Aug 2012
Location: Los Olivos, CA
Posts: 3,192
Quote:
Originally Posted by ANAO View Post
I've been wondering something.

With all else being equal, how does a compact geometry differ from a standard geometry specifically as it relates to the rider's fit and relationship to the machine?

Sent from my SM-G960U using Tapatalk
Ideally, it doesn't. In theory, the bottom bracket, saddle, and handlebars all stay in the same position. You're just sloping the top tube down, shortening the seat tube, shortening the seatstays, and lengthening the seatpost.

Here's a simple graphic:
Reply With Quote
  #3  
Old 04-29-2020, 01:16 AM
robt57 robt57 is offline
NJ/TN/PDX
 
Join Date: Nov 2012
Location: PDX
Posts: 1,542
IMO, particularly good for folks which bikes tend to be too tall standover when long enough and/or adequate stack.
__________________
Ride as much as you wrench. Words of wisdom.
Reply With Quote
  #4  
Old 04-29-2020, 04:39 AM
Peter P. Peter P. is offline
Senior Member
 
Join Date: Mar 2006
Location: Meriden CT
Posts: 5,147
Quote:
Originally Posted by robt57 View Post
IMO, particularly good for folks which bikes tend to be too tall standover when long enough and/or adequate stack.
Agreed. That's why they're good for mountain bikes, where you may dismount hastily on dicey terrain. Otherwise you might bang your privates on the top tube. Ask me how I know...

My road bike is built with a compact geometry for just the reasons you mentioned above. I have long legs and a short torso. So I ride a smaller size with a shorter top tube to better fit, but the bars are too low. So I spec'd a sloping top tube so that I could get a slightly taller headtube to raise the handlebars.

One more possible benefit of compact frames are the longer seatpost extensions which result. If you're using a carbon seatpost, you may be able to take advantage of the slight flexing properties of some carbon seatposts as a little suspension.
Reply With Quote
  #5  
Old 05-14-2020, 07:58 PM
boywonder boywonder is offline
Member
 
Join Date: Mar 2020
Location: Santa Barbara
Posts: 41
No difference,just easier to mount or dismount . It does lower CG of bike though.
Reply With Quote
Reply

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 03:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.