The new SunRace MZ 12-speed mountain bike groups takes a lot of the high end modern drivetrain tech, and brings it down a price notch. With a complete catalog of 12-speed wide range cassette options, including a massive 10-52, there’s something for everyone. Pair those with a SRAM or Shimano 12-speed setup to save coin, or go all in and use SunRace’s own MZ shifter and derailleur, too…
At the top of their range is the CSMZX1X cassette, which gets a machined aluminum upper cluster holding the 32/36/42/50 tooth cogs, paired with steel lower cogs. Claimed weight is 439g, putting it just slightly under the actual weight of a SRAM GX Eagle cassette.
What’s cool is that you can choose between black chrome or silver lower cogs, and black or gray upper cogs. The design requires a SRAM XD Driver Body on the hub, but actually uses their own adapter to make it work:
The adapter slides over the XD Driver, then the cassette slides on and threads into the XD freehub body just like a SRAM cassette would.
Below the top level cassette are a smorgasbord of other 12 speed options, including the MZ91X that gets the largest range of 10-52. Complete option list with specs below:
The derailleurs come in two versions, one with an alloy cage and normal pulley wheel…
…and this top end one with carbon cage and minimalist pulleys. Claimed range maxes out at 50-tooth compatibility, though, so you may want to limit the cassette (as if 50 teeth is limiting) to their second largest option.