Shimano SLX M660 mountain bike crankset (9-speed) review

Great in both double or triple options

Our rating 
4.5 out of 5 star rating 4.5
GBP £159.99 RRP | USD $246.77
Shimano SLX M660 crankset

Our review

High-end features and performance at an unbeatable price
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SLX is Shimano’s mid-range groupset, and its various constituents have been winning plaudits for their combinations of price and performance. At 100g lighter than Deore but only a packet of crisps heavier than XT, SLX hits a weight sweet-spot for the money too.


Nearly all the features of XT are thrown in – hollow-forged arms, the same bottom bracket, extra lip seals and so on. You even get a composite middle ring, though the reinforcement is more nylon, less carbon. The inner ring is steel too.


We like the polished outer faces of the arms, which stay looking good through heel-rub abuse, although the logos gradually disappear. A less elaborate array of shift ramps and pins is available compared with XT, but actual shift performance is still excellent, and that counts for a lot.

Product Specifications


Name SLX Crankset
Brand Shimano

Description Options = 44/32/22 triple, bashguard/36/22
Weight (g) 899
Bottom Bracket Type Hollowtech II
Bottom Bracket Shell Compatibility 68mm 73mm
Crank Arm Lengths 170mm 175mm