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Re:bike geometry, what is "offset" and "trail"? Thanks!(nm)(9 posts)

Re:bike geometry, what is "offset" and "trail"? Thanks!(nm)jtferraro
Oct 11, 2002 7:33 AM
Think I figured out what offset is - how far out the front hub..jtferraro
Oct 11, 2002 7:44 AM
is in relation to the headtube?

-Jeff
Think I figured out what offset is - how far out the front hub..No_sprint
Oct 11, 2002 7:46 AM
That is called rake.
Fork Rake... Higher # = front hub further fwd?Fez
Oct 11, 2002 9:46 AM
For ex, 45mm fork rake extends front hub further forward than a 40mm fork rake?
Fork Rake... Higher # = front hub further fwd?Chen2
Oct 11, 2002 10:38 AM
Yes, and less trail, and quicker steering.
~Al
Trailbrider
Oct 11, 2002 7:49 AM
Trail is the distance that the front wheel contact point (directly below the hub) "trails" the point where a line through the steering axis (the center of the head tube) intersects the ground. This is a product of wheel size, fork rake, and head tube angle. Has a large bearing on the steering stability of the bike.

I believe the term "offset" refers to "rake," which is the perpendicular distance from the steering axis to the front axle.
re: Re:bike geometry, what is "offset" and "trail"? Thanks!(nm)Chen2
Oct 11, 2002 8:30 AM
Here is a good description with a diagram. http://www.phred.org/~josh/bike/trail.

~Al
Good URL, disregard previousChen2
Oct 11, 2002 9:22 AM
http://www.phred.org/~josh/bike/trail.html

~Al
try this site...C-40
Oct 11, 2002 8:31 AM
http://www.msteelcycles.co.uk/wuzframed.htm