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B
Bar ends
Handlebar extensions which mount on the ends of a straight-ish mountain-bike style handlebar to provide extra hand positions.
Base layer
A base layers job is to keep you comfortable during exercise by wicking sweat away from your skin and maintaining your core body temperature.
Betty
Any female rider
Bidons
French name for water bottles.
Bike bags
Bike bags are the alternative to a cardboard box if you want to transport your bike by plane. They can be rigid or fabric. The former provide better protection but are heavier (which is worth considering with reduce airline weight limits) and the latter are easier to store and lighter.
BMX
Bicycle Motorcross! What any self-respecting teenager hangs out on.
Body armour
If you are going downhill, offroad fast then body armour can provide you with some sort of lightweight protection against immovable objects.
Bonk
When a cyclist hits the wall and has no energy to continue. An endurance cyclist must replace the energy consumed whilst on the bike. This means consuming energy bars, energy drinks, fruit or other nutritional products on an ongoing basis. The effects of bonking can be spectacular and result in previously strong cyclists coming to a shuddering halt.
Bottle cages
The cages which bidons fasten into on the frame. They can be made of aluminium or of more light weight materials such as carbon.
Bottom Bracket
The part of the frame around which the cranks revolve, also the bearings and axle assembly that runs through the bottom bracket shell of the frame.
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