Controltech 2×9 chainrings review

Off-road double chainset

Our rating 
4.0 out of 5 star rating 4.0
GBP £50.00 RRP | USD $69.00
Controltech’s 40/29t is a neat 2x9 ratio

Our review

At last, gearing for 2x9 setups when big climbs are on the menu
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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. 

Product Specifications


Name 2X9 Chainrings (09)
Brand Control Tech

Description 40/29Tooth setup
Pitch/Bolt Circle Diameter 94
Chainring Set-up Double
Chain Speed Compatibility 9
Chainring Material 7075 T6 Aluminium