I have DT Swiss rear shock that I want to fit to Cannondale frame. The overall width of the bushes needs to be 21.8mm and 25.4 mm.
Looking at Chain Reaction website, the only one I found that sells them, I see they are avialable in that size (8mm bolt).
The photo below shows a pair of bushes. Am I correct in thinking the cylindrical part fits into the shock eyelet without a central tube, so the larger diameter end of the bush fits against the frame? Where do the o-ring fit?
(The Rockshox I am replacing has centre tube with two end caps)
Help with DT Swiss bushes
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You are correct, no center tube. The bolt itself is the tube. Small end of the little cone shaped spacers go against the spherical bushing, large end against the frame. O-rings go between the shock bushing and the spacer, to provide a little sealing.
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The DT-Swiss rear shocks are designed to remove potentially damaging sideload stress from the shock through this "ball and socket bushes" and the O-rings work to provide cushion to this movement - like cartilage on your knee joints.