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How to measure travel on a fork?

Old 05-14-10, 08:36 AM
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xfimpg
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How to measure travel on a fork?

Hi
I have a Fox Float RL and can't find anywhere where it states the length of travel.
Is it as simple as measuring the length of the stanction (what's visible)?
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Old 05-14-10, 09:01 AM
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Originally Posted by xfimpg View Post
Hi
I have a Fox Float RL and can't find anywhere where it states the length of travel.
Is it as simple as measuring the length of the stanction (what's visible)?
Ziptie just above the seal. Ride the bike over some rough terrain and measure the distance the ziptie moves. Not the complete travel but close enough. Look at the left leg of the shock on my bike in the picture for an idea of how it works



The black band about 3/4 of the way up the leg is the ziptie
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Old 05-14-10, 09:30 AM
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Originally Posted by cyccommute View Post
Ziptie just above the seal. Ride the bike over some rough terrain and measure the distance the ziptie moves. Not the complete travel but close enough. Look at the left leg of the shock on my bike in the picture for an idea of how it works



The black band about 3/4 of the way up the leg is the ziptie
Sorry, i meant the total possible travel.

Hey, those are Panaracers! Solid choice indeed.
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Old 05-14-10, 09:36 AM
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Originally Posted by xfimpg View Post
Sorry, i meant the total possible travel...
Same as above, but reduce the preload on the springs to minimum/ drop the air pressure, and ride off something big.
What will you do with this information?
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Old 05-14-10, 10:17 AM
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You can also disassemble the fork and remove the guts. Then slide the stanchions all the way down and measure how much travel that is. This is approximation as you need to subtract the compressed height of the spring. Although on some designs there is a bump-stop at the bottom that prevents the spring from compressing all the way.
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Old 05-14-10, 11:34 AM
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Originally Posted by Metzinger View Post
Same as above, but reduce the preload on the springs to minimum/ drop the air pressure, and ride off something big.
What will you do with this information?
It's for information purposes, should i need to replace the fork at some point. The manufacturer states that my model came with 80, 100, 120mm travel, but I can't find the writing on the fork itself.
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Old 05-14-10, 01:01 PM
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Originally Posted by xfimpg View Post
It's for information purposes, should i need to replace the fork at some point. The manufacturer states that my model came with 80, 100, 120mm travel, but I can't find the writing on the fork itself.
The ziptie will get you close enough. If the fork is an 80mm fork, the travel...especially if you reduce the preload like Metzinger suggests...will be less than 80mm. If the fork is a 100 mm fork, the travel will be around 100 mm but more than 80mm. If it's a 120mm fork, the travel will be less than 120mm but more than 100.

By the way, the ziptie will also help with tuning the fork. It lets you measure the sag so that you can set the pressure correctly.
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Old 05-14-10, 01:38 PM
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Well, I measured the visible part of the stanctions and they are exactly 100mm long. Would that make it a 120mm?
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Old 05-14-10, 04:34 PM
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Originally Posted by xfimpg View Post
Well, I measured the visible part of the stanctions and they are exactly 100mm long. Would that make it a 120mm?
More likely 80mm
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Old 05-14-10, 07:10 PM
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Thanks everyone for your contributions.
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