RockShox revamps SID fork
By Jez Loftus, technical editor | Saturday, September 1, 2007 8.00am
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The RockShox SID (Superlight Integrated Design) fork reaches its ten year anniversary in 2008 and to celebrate SRAM, the manufacturer of RockShox, is launching a new SID. The rebirth of the original blue is the only thing in common with the race fork of old and for 2008 the fork has undergone a complete redesign that should take it into the next decade of XC racing.
SRAM has made a great deal of improving on the performance of previous SID forks, listening to criticisms and working on the shortfalls of older versions, improving the stiffness and reliability being a major goal.
As a race fork weight is always paramount but RockShox are keen to get over the fact that making a lightweight fork is incredibly easy. The challenge lies in making a light and stiff fork. That didn't stop them setting a sub 1500g target and the use of redesigned internals and composite structures have helped them achieve that goal - importantly without compromising stiffness. In fact the new SID has more in common with the current Reba fork than the SID of old and with a 100mm travel option the fork will certainly suit a broad range of riders.
The Nuts and Bolts
Stiffer than a Reba World Cup yet 100g lighter is an impressive claim so how have RockShox done it? One thing you'd only notice by dismantling the fork is that the 32mm upper tubes are significantly shorter than a 100mm Reba fork. This means the internals are shorter and there's even less oil in the fork for that tidy bit of weight saving. The base of the Magnesium lowers are recessed - further saving on unnecessary weight but with the added advantage of shielding the lower controls.
At the brake end the post mount for the disc calliper has been tracked inboard to reduce flex and tidy up calliper alignment. The fork lowers will even take the force from a 185mm disc.
Just like the big-hitting Lyrik and Totem forks the lowers of the SID feature Power Bulges to increase stiffness at the bushes. The SID World Cup even gets carbon Power Bulges just to eek out that last bit of weight.
As for the guts of the fork RockShox stick with trusted Black Box Motion Control. Dual Flow compression with dented low speed compression adjustment and Dual Flow rebound with dented initial stroke adjustment make the fork supple over the small stuff, stiffening up on the bigger hits. One very nice part on the internals is the titanium spring on the Motion Control, very flash indeed. There are even carbon control knobs and an option of a cable remote lockout. The Dual Air spring keeps weight down and tunability high.
RockShox is also making a big thing of serviceability and say the SID shouldn't require any more attention than any of their other forks.
There are three forks in the SID range all available in 80 or 100mm travel options and ready to race for 2008:
SID Race (1450g)
SID Team (with Black Box Motion Control, 1450g)
SID World Cup (Black Box Motion Control and carbon Power Bulge, 1440g).
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