Rotor REX 2.1 QX1 crankset

THE REX 2.1S are impressively stiff, lightweight and multi frame compatible, even if you don’t buy into Rotor’s asymmetric chainring concept.

They’re made from 7075 alloy rather than the 7055 used on the pricier REX 1.1s, which adds 42g. But they’re still relatively light, and the internally triple-drilled arms are just as stiff under power. The cunning reverse crank-cap makes them easy to get on and off, and the oversize axle syncs with a selection of BBs to fit all frames. Check spacing and clearances though – the straight arms don’t give much chainstay space. The oval QX1 rings have to be bought separately and can be moved between three positions to alter their unique, dead spot minimising feel. If you’re not convinced, SRAM spiders are also available.

WEIGHT: 600g
ARMS: 170, 172.5, 175mm

Price 402$

Cannondale Trail SL 29 SS

The fat aluminium tubes are a constrast to the skinny items seen elsewhere in the test, but this rigid Cannondale uses them to create one of the most old-school - and lightest - rides here.

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KONA SHRED

With a reputation for no-nonsense ruggedness and a background in the always progressive and punishing riding of Canada, Kona have been building hardcore hardtails for longer than almost anyone else. The Shred is the most expensive bike on test but it’s a proper trail tank.

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SKS Airbuster CO2 inflator

The alloy Airbuster has a large knob so you can regulate the flow of gas, a mechanical stop to prevent the cartridge being pierced in transit and a dust cap to keep the valve free of debris. While it works with Presta and Schrader valves, switching between them requires a fiddly change of the valve head. The thin rubber sleeve doesn’t provide much protection from cold spent canisters. You can’t insert much of the valve into the inflator head, so you have to be careful to avoid leaks. Price $33 w/16g cartridge

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