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Adustcap is a smallcover used on thevalve stem of abicycle orcar tire to preventdust or other smallparticles from entering the valve and damaging it. Dustcaps are usually made fromplastic but may occasionally be made ofmetal. The dustcap is internally threaded and is secured by screwing it onto the end of the stem. To prevent corrosion due toelectrolysis and malfunction of the electronics in adirect TPMS and avoid costly repairs, metal valve caps without insulating plastic linings should not be used on direct-TPMS-equipped tire valve stems.[1]
A dustcap may also refer, on a bicycle, to thecrankarm bolt cover. It is usually a piece of metal or plastic that, on the crankarm, is snapped or screwed into the threadedcounterbore, which houses the bolt that holds the crankarm to its axle, thebottom bracket spindle. The dustcap serves to protect the threads (on the inside of the counterbore), which are used with acrankarm puller to remove the crankarm from the spindle.
A dustcap may also refer, on a bicycle, to the metal ring that covers the bearings in a cup-and-cone ball-bearing hubset.
| Frame |  | |
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| Wheels | ||
| Drivetrain | ||
| Cabling | ||
| Peripherals | ||
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