Control Tech 2X9 Chainrings (09) | $69
BikeRadar verdict
"At last, gearing for 2x9 setups when big climbs are on the menu"
Using a double chainset off-road instead of the normal triple makes sense with Controltech’s interesting ring sizes.
The 40t outer ring is smaller than anyone else’s (normally 42/44), ensuring low ratios and a high cadence for more mountainous areas.
Hard 7075 T6 alloy shows good wear, while a 94mm bolt circle diameter will fit any mountain bike compact double crank. Shifting is smooth and precise thanks to steel pins, machined ramps and profiled teeth.
It’s hard to criticise a component that simply does it’s job. We’ll know more about ring durability after further testing.
User Reviews
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0.3
User review of Control Tech 2X9 Chainrings (09)
40t in a dual setup for "more mountainous areas"? What?
The usual 2x9 setup for bigger mountains is something like 22/36.
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0.3
User review of Control Tech 2X9 Chainrings (09)
Timer.. you are thinking of a 3x9 setup but with the outer ring removed. Not quite the same...
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0.3
User review of Control Tech 2X9 Chainrings (09)
Or you could consider the Middeburn Duo which gives you the choice of:
Inner - 27, 29 or 32; and
Outer - 40, 42 or 44.
Okay you have to buy the cranks as well but I really do not think that can be counted as a disadvantage. The RS7 is an all time classic, been around for years and still cutting it with the best.
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0.3
User review of Control Tech 2X9 Chainrings (09)
No mention of the inner ring at all???? What size(s)?
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0.3
User review of Control Tech 2X9 Chainrings (09)
These are designed as an XC race double for people who may not have any use for a piddly little 22t ring. Don't confuse it with the double and bash setup you may have on your "all mountain" bike, these are designed for a different set of riders with a different purpose in mind.
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0.3
User review of Control Tech 2X9 Chainrings (09)
So, no need to pedal hard on the DH bits then?!
I remember the old days before compact drive when I had a 50t for ultimate speed!
I use middleburn RS7's - seriously the best set of cranks in existence. XC lightweight & even guaranteed for DH & dirt jumping!
And the RS8 is lighter again, but no jumping!
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0.3
User review of Control Tech 2X9 Chainrings (09)
jnr_seahorse, if you click on Show Full Specification you'll see the inner ring is a 29t.
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Specification
- Name:
- 2X9 Chainrings (09)
- Built by:
- Control Tech
- Price:
- $69.00
- Description:
- 40/29Tooth setup
- Pitch/Bolt Circle Diameter:
- 94 mm
- Chainring Set-up:
- Double
- Chain Speed Compatibility:
- 9
- Chainring Material:
- 7075 T6 Aluminium
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