Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Gee, I didn't mean to scare you with the concept of trig functions or complex math. All the hard part was done by the folks who made the chart so all you needed was simple arithmetic and the ability to find numbers on the chart I linked for you.
Anyway, here it is done for you.
Assuming that you have a 42", (1065mm) wheel base
the original fork 410 / 1065 = .385, from the tan chart, a hair more than a 21° angle (tan = .384)
replacement fork 395 / 1065 = .370, from the "" "" "" slightly more than a 20° angle (tan = .364)
So changing the fork and dropping the head 15mm will change the head and seat tube angles by just slightly less than 1°
Whether 1° is meaningful is your call, but at least you know.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance
Last edited by FBinNY; 03-26-11 at 05:08 PM.