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Fox Fork Question

672 Views 7 Replies 8 Participants Last post by Polk, Jan 6, 2010

IBIKEAZ

Discussion Starter · Jan 5, 2010

Hey there. I got my Tallboy bike finally and it came with a 120mm fox fork instead of the 100mm I thought I was getting. It turns out even Santa Cruz didn't know they had been sending out some 120's. I had a tough time deciding between the 100mm and 120mm initially, so I think I'll try the 120mm (I've heard you can lower it to 100 if needed). My question is, can you run more sag in a 120mm and lower the front end a bit or will that mess up the way the fork reacts to the terrain? Will putting less pressure in the fork lower the axle to crown a bit? I like the idea of the extra travel but want the bike to handle like it was intended to. Thanks

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metelhead

· #2 · Jan 5, 2010

shouldn't be an issue on the frame...you can convert to 100mm with a spacer- I'm sure SC can provide that for you(or might have come with you Fox manual.)

I just put a 120mm on my 429 and love it! I run it with more sag and adjust the air/compression to give it a progressive feel to it. also flipped a HS spacer on to the top of the stem to adjust ride height...but the extra travel just feels right.

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Joe Nation

· #3 · Jan 5, 2010

[tangent] If you reduce the travel, does the axle-to-crown stay the same or get reduced as well? [/tangent]

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b4 stealth

· #4 · Jan 5, 2010

Joe Nation said:
[tangent] If you reduce the travel, does the axle-to-crown stay the same or get reduced as well? [/tangent]

I can't say with absolute sureness because I have no experience with internally adjusting fox fork travel, but every other travel reducing system I have ever seen. Ever. Has reduced the axle to crown when travel is reduced.

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boomn

· #5 · Jan 5, 2010

Yep. I don't have a Fox, but I can guarantee that it does shorten it to the same length as a stock 100mm fork

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ignazjr

· #6 · Jan 5, 2010

They shorten the same way as a Reba - you install a spacer on the spring shaft inside the fork. It'll shorten the A-C as it reduces the length that the fork can extend.

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Duzitall

· #7 · Jan 6, 2010

IBIKEAZ said:
My question is, can you run more sag in a 120mm and lower the front end a bit or will that mess up the way the fork reacts to the terrain? Will putting less pressure in the fork lower the axle to crown a bit? Thanks

It will be shorter A to C static (sagged with your weight) but when you are climbing and the front is light it will extend back to a 120mm position. Best to get the spacer. Even if you have to pay someone get it and put it in.

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Polk

· #8 · Jan 6, 2010

Set sag at 20-25%, just like most forks. So the total sag will be more, but even sagged, the A-C will be longer than the 100mm fork. Don't try to set so much sag that the A-C will be the same as the 100mm fork; it will be really mushy and probably bottom out easily.

If you were so undecided between 100mm and 120mm, consider this divine intervention or something!

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