DISRAELI GEARS

SunRace MZ90 (RDMZ90.MD00)

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The SunRace MZ90 is a fantastic sci-fi take on the modern '1X' derailleur. It is an essay in swirling curved surfaces and light glinting off the edges between them. The whole composition is highlit using a colour pallette including several shades of silver/grey and SunRace's signature gold detailing. H. R. Giger would have loved it - if the Alien had decided to pursue Sigourney Weaver on a bicycle, this is the derailleur it would have chosen.

Technically the SunRace MZ90 is constructed from forged aluminium with a composite p-knuckle and cable roller assembly and a carbon outer pulley cage plate. As is the fashion of the moment, it has a switchable clutch. In a nod to keeping the weight under some kind of control, it has an aluminium hanger bolt, titanium small parts and dramatically cutaway sealed-bearing pulleys.

It's an original and stylish object - I am just not sure that I would want to risk bashing it on a rock. Somehow, it looks too precious and fragile for off-road use - but appearances can be deceptive.


  • Derailleur brands: SunRace
  • Country: Taiwan
  • Date of introduction: 2017
  • Date of this example: unknown
  • Model no.: RDMZ90.MD00
  • Weight: 264g
  • Maximum cog: 50 teeth (source: SunRace)
  • Total capacity: 40 teeth?
  • Pulley centre to centre: 67mm
  • Index compatibility: 12 speed
  • Chain width: 3/32"
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: aluminium with a composite p-knuckle, a carbon outer pulley cage plate, an aluminium hanger bolt and a smattering of titanium small parts
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