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I've just built up a new bike, I have a new SID Team fork on it. Under braking the fork shudders back and forth, you can see this if you look down at the front hub while braking - it moves back/forth a bit, hard to say by how much but I'd guess 6 to 10mm. It feels like a loose headset through the bars but it's not the headset - this is tight and fine. My set-up is a Formula R1 brake with a 180mm XTR rotor on an XTR hub, Hope headset. All the caliper bolts are tight, the caliper & rotor are centred correctly, the centrelock cap/nut for the rotor is correctly torqued. The movement occurs on anything more than the lightest of braking and I'm doing XC riding on a lightweight hardtail, no freeridey type stuff. I weigh about 73kg in my riding gear. I've put up about 150km on the new bike/fork/brakes. The fork is rated to a 185mm rotor by Rockshox. Is this normal for this fork? Anyone else experienced this?
I have the same fork and mine doesn't do this, I'd get it checked out by a pro before riding if I were you.
Is your headset adjusted correctly? Sounds like you could have play in it.
if you bought them new, i believe there has been a few horror stories of some 2010 sids having very little, if any oil in them,and causing signs of bushing wear.just after what you would think is the bedding in period.
dont have any proof or anything but i also believe there may be a slight issue with the seal between the - and + chamber.
"It feels like a loose headset through the bars but it's not the headset - this is tight and fine"....Pretty sure it's not the headset, I've nipped it up until it seems correctly preloaded. The Hope headset uses their "Head Doctor" device instead of a star nut in the steerer but this only preloads the bearing, once that's done the stem clamp should hold everything together. Anyone think it may be related to the Head Doctor? I'm reasonably competent mechanically and feel it isn't the headset, I know a lot of people put up on forums about having problems with breaking the alloy bolt but that's because they dont understand the concept of how it works.
Merchant-Banker: That doesn't sound good. Maybe I should get them checked out. I bought them last December from Merlin Cycles but only got my new frame and built the bike up last week.
My 09 SIDS had no oil whatsoever in either the positive or negative chamber, its something worth checking. I also had a pair of fox forks that had no oil at all in the chambers from new.
Gareth
Anyone know how many cc of oil should be in the positive and negative air chambers respectively? I looked on the SRAM website but could only find info for the up to 2007 model which is the old 28mm stanchion original SID.