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P
Panniers
Bags that sit on the side of the bike. Often these come in pairs and are placed at the rear and/or the front of the bike.
Pedal cleats
Pedal cleats fit to the bottom of cycling shoes and attach to the clipless pedals. There are a variety of types for road or off-road. Cleats have to be compatible with the pedals.
Pedals
These can be flat or clipless. Clipless pedals permit cleated cycling shoes to clip in and out of the pedals.
Peloton
The main group of cyclists in a professional road race.
Polka dot Jersey
Worn by the rider with the highest number of king of the mountains points. King of the mountain points are awarded for the first riders to go over a classified climb.
Presta valve
The thinner valve found on most road bike inner tubes.