KCNC Razor disc brake rotor review - Bike Magic

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Disc Brake Systems

KCNC Razor disc brake rotor review

A Shimano 180mm 6-bolt disc rotor weighs 138g. A same size KCNC Raptor rotor is just 94g. Fit a pair of KCNC rotors and you’re looking at a big weight saving on your bike without any loss of performance. Yet aside from the clear weight saving, performance is clearly key to such a product. In this respect the KCNC Razor rotors performed every bit as well as the Shimano rotors they replaced.

Ok, so disc rotors might seem like the last place you’d want to save weight, but if you’ve already shed as much as you can from every other component on your bike, then these lightweight aftermarket rotors are a nice way to finish off your bike.

Maybe you have a spare pair of wheels and you want to be able to easily swap from set to set (you might want a designated race set for example)? Or you’ve bent or broken a rotor and need a replacement? These are inexpensive and will fulfil such a need. We’ve paired ours with the lightest wheel and tyre combination we have for racing duties, where every bit of weight matters. Even if it’s only a placebo effect…it works.

Just 94g for a 180mm rotor and in a vital place on the bike, the KCNCs are perfect for weight-shavers.

We also think they look better than many stock disc rotors as well, with the small triangular cutouts giving a very smart look to the wheels.

They’re available in all common sizes, 140, 160, 180 and 203mm, have a 6-bolt drilling and are made from steel – claimed as “the lightest steel discs available”. We haven’t given them the ‘piling into a flying rock’ test, which presumably they would come away from in a worse state than beefier options, but if you’re buying a product to reduce the weight of your cross country racing machine then you probably won’t be all-too-bothered by that.


Lighter than stock disc rotors with no drop in performance.


Light weight


Less robust that a standard disc

Price: from £18.99
More information: Clee Cycles

What KCNC says:

  1. High grade 410 stainless steel (specifically for brake disk use)
  2. Double ground for superior flatness
  3. Heat-treated to 42HRC


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