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 Post subject: Setting up forks
PostPosted: Wed Jul 25, 2012 3:34 pm 
Posts: 161
Hi all

Can someone give me a bit of help setting my forks

I have rock shox xc32 tk 29er forks

I'm 6ft 2 and weigh approx 100kilos

Since I got the bike I have twiddled the knobs both on the top and underside of the fork, as I have definitely bottomed out on more than 1 occasion (seriously considering a set of rebas)

I have had a surf round but ant seem to understand what's being suggested

I see SAG being mentioned but how do u measure it, I understand it's the flex in the fork whilst stationary (I think )

Any help appreciated

Thanks

Stephen


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 Post subject: Re: Setting up forks
PostPosted: Wed Jul 25, 2012 4:07 pm 
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Posts: 1166
Sag is how much the fork compresses when you sit on the bike stationary and should be around 30% of the total fork travel. Your fork doesn't have travel guides on the stanchions so just put a cable tie around one of the stancions, sit on the bike and push down on the fork then sit normally and allow the fork to settle. push the cable tie down to the fork dust seal and then get off the bike and measure the distance between the seal and the cable tie. You can adjust the preload until this distance is 30% of the total travel.


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 Post subject: Setting up forks
PostPosted: Wed Jul 25, 2012 4:11 pm 
Posts: 161
Ok thanks for that, will go do know, and what does the dial lever on the bottom do with the hare and tortoise I'm guessingit's how quick it springs back


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 Post subject: Re: Setting up forks
PostPosted: Wed Jul 25, 2012 4:12 pm 
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Posts: 1166
Yes, that'll be the rebound setting. If the fork still bottoms out then it might be worth looking at swapping the spring for a firmer one.


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 Post subject: Setting up forks
PostPosted: Wed Jul 25, 2012 4:17 pm 
Posts: 161
Ok I just did it and if I sit on it stationary I fall over lol

So get on and stay upright for a couple of seconds with brake on, is that right? Or am I being a dumbo


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 Post subject: Re: Setting up forks
PostPosted: Wed Jul 25, 2012 4:40 pm 
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Posts: 1166
Handlebar against a wall or someone who can hold the bars from the front for you normally works!


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 Post subject: Setting up forks
PostPosted: Wed Jul 25, 2012 8:35 pm 
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Posts: 2755
Location: Riding my bike somewhere
Fit a set of stabilisers on the back then you don't need a wall or grown up to hold the bike for you ;-) lol

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Whyte G-160RS
YETI SB95A


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 Post subject: Setting up forks
PostPosted: Wed Jul 25, 2012 9:20 pm 
Posts: 161
Eccles wrote:
Handlebar against a wall or someone who can hold the bars from the front for you normally works!

lol I figured resting or holding it would not allow the bike to flex properly


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 Post subject: Re: Setting up forks
PostPosted: Thu Jul 26, 2012 7:38 am 
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Posts: 3548
Location: essex
If you are struggling then perhaps get on the bike and roll forwards gently and see where it settles.

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www.pinkbike.com/u/nwmlarge/


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 Post subject: Re: Setting up forks
PostPosted: Thu Jul 26, 2012 11:25 am 
Posts: 110
Location: Colchester
Stick yer elbow out and lean against a brick wall - usually does the trick. As the guys have mentioned the sag should be between 20-30% - so for a 100mm fork about 20 - 30mm. I would guess that at 100kg you would need a extra firm spring. It probably came wth a medium or a firm. If the bike is new and came from a local shop you might be able to convince the shop to swap it for you. The spring guide is here

With the rebound knob, aim to start with it somewhere in the middle - see how many complete turns of the dial you can get from min to max, then half the number and turn it back. The faster the spring return (toward the hare), the quicker it is ready to take another hit, BUT if it rebounds to fast you will get a 'pogo' effect - this messes with your control of the bike.

Best way is to find a short length of trail and ride it repeatedly making ½, then 1/4 turn adjustments until you find something you like.


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