I think you may be a little restricted for choice regarding MC18 rear-sets these days.

I have an HRC set for my R5K; I don't know off-hand of anyone who still makes aftermarket kits now.

Smooth shifting will more than likely be down to how little wear there is in the bushes and/or bearings and how the angles of the lever, pushrod and knuckle are set up. There's no reason why any particular kit should be any better or worse than a stock setup when adjusted correctly, although it can "feel" different and take a little getting used to.
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Andy.
NSR-WORLD.COM

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