The XSO chains features RK's proprietary "RX-Ring" seal design and is offered in 520

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The theory is that all dirt gets trapped by the oil filters

It required two years of development and testing

which provide excellent wear resistance in the center of the tread while optimizing wet and dry grip on the shoulders

ÖHLINS - Fork Springs (08865-01) (FSK FKC 101 lowering kit -25mm/-1 inch) - Pair of springs Options:08865-01 The XSO chains features RK'shlins fork springs are developed specifically for hlins cartridge kits and front forks. But they are also in itself a great front end upgrade and as such available as a spring upgrade for most major bike models. This listing is for TWO springs. Specifications 13 N mm Compatible with FSK 101 and FKC 101 cartridges NOTE: For best handling characteristics, hlins recommends to combine this kit with a lowered rear (12 mm). Fitment 1997 2013 Harley Davidson