MTB Suspension fork dimensions

[supavan]

Hi everyone.

 

I'm trying to find out if there is any difference in the length between the Fox F32 RL 100 and 120. I'm talking crown to dropouts.

 

The reason I ask is that I've had to replace my bike's frame which came with a Fox F32 RL 100mm suspension fork. The new frame is a GT Sensor 1.0 which would normally be fitted with a the 120mm variant of that fork.

 

I'm pretty sure the fork would be 20mm longer to allow for the extra travel but I can't confirm this since I can't find any dimensions on these forks.

 

As much as don't want to mess up the frame's design angles by fitting the wrong length of fork I don't want to go spend thousands to get a 120mm if the actual external dimensions are similar.

 

Measured from where the crown meets the frame to where the centre of my 9mm QR skewer is, I get approximately 48cm.

[LourensD]

Think these might help:

 

http://forums.mtbr.com/shocks-suspension/forks-complete-axle-crown-lengths-library-470024.html

http://www.pinkbike.com/forum/listcomments/?threadid=78006

 

20 mm decrease from 120 to 100 in Axle to Crown length will only increase your bike's head angle by one degree. 0 degrees being completely parallel with the ground and 90 degrees bieng completely vertical. See: http://en.wikipedia.org/wiki/File:Bicycle_dimensions.svg.

 

I think the GT Sensor has a head angle of about 69.5 degrees, so putting a 100 mm fork on will increase it to about 70 degrees more or less. This is still normal XC-bike geometry

[supavan]

+1 Lourens. That is exactly what I've been looking for. Thank you.

[droo]

1 degree difference in head angle is a lot... do a bit of homework, you may find that you can extend the travel on your existing fork to 120mm by shifting some spacers around.