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


Go Back   > >

Fifty Plus (50+) Share the victories, challenges, successes and special concerns of bicyclists 50 and older. Especially useful for those entering or reentering bicycling.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-02-05, 05:53 AM   #1
TaosWoman
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Taos, NM
Bikes:
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Frame Geometry ?

People on the forum often talk about road bikes being more aggressive than comfort bikes. What exactly does that mean.
TaosWoman is offline   Reply With Quote
Old 09-02-05, 08:46 AM   #2
FarHorizon
Senior Curmudgeon
 
FarHorizon's Avatar
 
Join Date: Jan 2005
Location: Directly above the center of the earth
Bikes: Varies by day
Posts: 3,856
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
"Aggressive" refers to the bicycle frame's geometry. Specifically, the angles of the head tube and seat tube to the horizontal. The more upright these angles, the more "aggressive" the frame is said to be. The effect of upright angles is to make the bike steer more quickly and to reduce the effects of the wheels' gyroscopic inertia. A bike with aggressive angles will be called a "twitchy" steerer. Such angles and steering characteristics are prized among racers, who must often make radical steering corrections to avoid spilled riders ahead.

In past decades (specifically, the 70's), racing bicycles typically had 72.5 degree head tube and seat tube angles. "Touring" bikes with less aggressive geometry typically had anywhere from 69 to 72 degree head and seat tube angles.

Today, it is not unusual to find "sport" bicycles with 73, 74, and even 75 degree head and seat tube angles. Such bikes are extremely "fast" and "twitchy" in the steering department. They are profoundly unsuitable for non-racing riders, despite being sold universally to riders who never plan to race.

Less aggressive geometry imparts stability to the ride, allows the rider to cycle securely even with no hands on the bars, and is more "forgiving" of unexpected potholes and stones in the road. You pays your money and takes your choice...
FarHorizon is offline   Reply With Quote
Old 09-02-05, 03:33 PM   #3
TaosWoman
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Taos, NM
Bikes:
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the explanation that was great!
TaosWoman 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 01:03 AM.