JAR­GON BUSTER

Cycling Plus - - GEAR GUIDE -

1 DI­RECT-MOUNT CHAIN­RING

A chain­ring that mounts di­rectly onto the crank axle or base of the crank arm rather than a sub­sidiary spi­der. They save weight and gen­er­ally look neater, although they can be more vul­ner­a­ble to im­pacts/warp­ing.

2 NAR­ROW/WIDE SRAM’s

much-copied sin­gle chain­ring in­no­va­tion that uses al­ter­nate nar­row and wide teeth that match the al­ter­nate nar­row and wide chain links and help keep the chain in place on rough ground. They also help re­duce wear by max­imis­ing the con­tact sur­face be­tween tooth and chain roller.

3 GEAR INCHES

When a gear is de­scribed in inches, that’s how far the bike will travel for one revo­lu­tion of the chain-set in that gear.

4 DI2

Shi­mano’s elec­tri­cally-con­trolled shifter and mech sys­tem.

5 CLUTCH MECH

A rear de­railleur with an up­rated spring or fric­tion bush­ing act­ing on the jockey wheel cage. This in­creases the ten­sion in the lower seg­ment of chain and stops it fall­ing off the chain­ring. SRAM clutch mechs are fixed ten­sion, while Shi­mano ones have an on/ off switch and user-ad­justable ten­sion.

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