Q factor
12-12-03 | 07:37 AM
#2
Don't Believe the Hype
Joined: Feb 2002
Posts: 2,668
Likes: 0
From: chicagoland area
Bikes: 1999 Steelman SR525, 2002 Lightspeed Ultimate, 1988 Trek 830, 2008 Scott Addict
Q factor refers to the length, or space of each crankarm to each other. a smaller Q factor number would mean a narrower space between crankarms, thus the pedals would be closer to the frame (your knees would be closer to the frame) supposedly making for better power transfer and better aero position...
i think that dura-ace has the narrowest Q factor out there.
i think that dura-ace has the narrowest Q factor out there.
12-12-03 | 12:01 PM
#3
Senior Member
Joined: Feb 2001
Posts: 12,948
Likes: 9
From: England
Former hour- record holder Graeme Obree designed a track bike with a really narrow Q, to make himself more aerodynamic.
His feet were so close together, there was no room for chainstays, so his raised them out of the way.
Generally, modern systems(like MTB triples) have a really wide Q compared to older/vintage models.
If you want to chose a particular width, select it on the basis of hip-width, leg and crank length, and aerodynamic requirements. There are no guidelines, and most people take what thye are given.
His feet were so close together, there was no room for chainstays, so his raised them out of the way.
Generally, modern systems(like MTB triples) have a really wide Q compared to older/vintage models.
If you want to chose a particular width, select it on the basis of hip-width, leg and crank length, and aerodynamic requirements. There are no guidelines, and most people take what thye are given.
