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    As the owner of a English car - all seals leak eventually. "All the oil above the seal" is a recipe for failure.
    – Criggie ♦
    Commented Aug 23, 2016 at 20:12
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    What everyone said about unsprung weight. Except that the amount of weight difference (when compared to other factors) is so tiny that it's not worth worrying about. The other mechanical factors may be worthwhile, or this may just be another marketing gimmick.
    – Daniel R Hicks
    Commented Aug 23, 2016 at 21:17
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    Not sure if I'd go as far as a marketing gimmick @DanielRHicks but I think Rockshox actually thought they had something with the RS-1 a few years back. If you look at the bikes in the Rio XCO there were a mix of both RS-1 and conventional RS forks in the mix. The winner rode what I'm guessing was a SiD. I think one of the key selling point's originally with the RS-1 was stiffness of the new hub, however since then Boost has come along and probably offers similar marginal benefit to elite riders.
    – DWGKNZ
    Commented Aug 23, 2016 at 23:25
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    @DanielRHicks It might not make a big difference on the forks, but there's even more of an effect for parts that spin, thanks to rotational inertia; small weight reductions from the rims can make a relatively big difference. But racers drive equipment improvements, and then ordinary riders want the same equipment the pros have, so an improvement that's not worth worrying about today can be what everyone demands tomorrow. Personally it would be a lot easier for me to lose some weight before I spend money on a lighter bike, ha ha!
    – rclocher3
    Commented Aug 24, 2016 at 19:46
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    The actual reason why unsprung mass is bad is terrain tracking. A lighter unsprung mass accelerates up and down faster for the same same forces, which means that wheel will track ground better and have better grip.
    – ojs
    Commented Aug 25, 2016 at 17:40