| Word |
Description |
| Degreaser |
A chemical used to remove dirt and grease from chains and drivetrains. |
| Derailleur |
Also referred to as ‘mech’, the derailleur is the mechanism that moves the chain from one chainring/cog to another when shifting. |
| Disengage |
Disengaging, in the case of bikes, means moving the part away, or releasing. |
| Disk Brakes |
A brake system that consists of a brake rotor that is mounted onto the hub of the wheel, and a caliper that is fixed on the frame or fork of the bike. The rotor fits in between the caliper and the pads compress against the rotor when the brake is activated. |
| Double |
A crank set having two chainrings. |
| Draft/Drafting |
A ride position whereby one rider rides directly behind a rider in front in order to gain an aerodynamic advantage. The rider behind expends around 30% less energy than the rider in front. Drafting is illegal in many triathlons. |
| Drive Train |
The transmission of the bike that consists of the chain, chainrings, cranks, bottom bracket, front and rear derailleurs, cassette, and rear hub. |
| Drop outs |
Located at the ends of the fork blades, and in the rear of the bike. Drop outs are where the wheels connect to the frame and fork. |
| Drops |
The lower part of a road handlebar below the brake levers. |
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