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Much like Microshift did, Sunrace is going big with new 10- and 11-speed wide range mountain bike groups.

The parts group will contain shifters, front and rear derailleurs and new 11-40 and 11-42 cassettes, providing yet another alternative to SRAM and Shimano for those wanting to put together a purpose-built drivetrain rather than hacking the one they have (not that there’s anything wrong with that).

Shift past the break for the details…

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The cassettes are made up of two upper sprocket clusters followed by individual rings for the smaller cogs. Two versions are offered, led by the CSMX9 with an AL7075 large cluster that comes in at a claimed 395g for the 10-42. Unfortunately, I didn’t quite get how they were able to put a 10-tooth cog on there, so check for an update soon.

Below that is the CSMS8 with full steel cogs to come in at 429g (11-40) and 465g (11-42). Both use alloy spiders for the two clusters.

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Both models are available in black and champagne colors.

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To handle the extra teeth, their rear derailleurs get a long cage and offset upper pulley. No clutch mechanism from the look of it…but the rest of the top-level Driven model is worth looking at closer.

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The rearward axle placement lets the upper pulley increase it’s space between it and the cassette more and more as you shift to easier gears, much the same as virtually all modern derailleurs designed for oversized cassettes.

2015 Sunrace wide range mountain bike cassettes and rear derailleurs

Minimalist pulley wheels and carbon outer plate keeps weight down to a reasonable 245g.

Sunrace.com

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Josh Benton
Josh Benton
7 years ago

Interesting that the der has no clutch. Also really interested in how they got a 10t cog on there with no special freehub carrier ala SRAM.

James N. Crider
James N. Crider
5 years ago
Reply to  Josh Benton

What 10-Tooth COG????

JoeP
JoeP
7 years ago

Need…check. Money…check. 11 speed be damned…check. Place to purchase from…….. . . . . . .

Veganpotter
Veganpotter
7 years ago

Hopefully these cassettes are $8 like their other ones

SImon
SImon
7 years ago

On the trail, nobody will know your cassette isn’t made by a big name-brand. Color me excited for this stuff!

elvis
elvis
7 years ago

yeah, I’ve been running shimano 11spd and wouldn’t mind a cheaper cassette for my training wheels

MikeC
MikeC
7 years ago

I thought MicroShift and SunRace were all part of the same company, including Sturmey Archer?

k
k
7 years ago

shimano cassettes shift so much better than everyone else, i am waiting for that trickle down….

Durianrider
Durianrider
7 years ago

Those rear mechs work with sram or shimano road shifters I wonder?

Andre
7 years ago

I tired of running out of gear…I’m moving back to 2×10, the real deal

Josh Benton
Josh Benton
7 years ago

Awesome, thanks Tyler for the update

Dubya
Dubya
6 years ago

Any update on these parts? A quick look at Sunrace’s site and at Amazon shows no hints of the wide range 10 or 11 speed bits. I’d love to hear an update!

Jason Prosseda
Jason Prosseda
6 years ago

I downloaded a catalog from Sunrace. The 10T, spacer, and 12T are one integrated piece. This pictures show the parts exploded.

Miki Laureano
Miki Laureano
6 years ago

Any long term reviews from these cassettes?