Attack: A sudden acceleration to move ahead of another rider or group of riders.

   Block: In road racing, an attempt to disrupt a chase by slowing down a paceline.

   Bottom bracket: A hole in the base of a bike frame where the axle unit is attached.

   Break/breakaway: A rider or group of riders that has left the main group behind.

   Bridge: To leave one group of riders and join another one that is further ahead.

   Caliper brakes: A brake consisting of two brake blocks which are drawn towards each other through a central pivot and which grip the rim of the wheel.

   Chainsuck: The chain getting caught between the chainstay and the rear wheel.

   Chasers: Riders trying to catch a breakaway group.

   Cornering clearance: The amount of lean angle a bicycle can have without digging a pedal; also called pedal clearance or road clearance.

   Countersteering: A manoeuvre used by expert riders to control a skid, executed by steering the bike momentarily in the opposite direction from which they want to turn.

   Digging a pedal: A pedal hitting the ground while the rider is leaning into a turn.

   Draft: To ride closely behind a competitor, saving energy by using that racer as a windbreak.

   Drift: The bike slipping sideways while going forward, usually as a result of taking a corner too hard.

   Echelon: A staggered line of riders, each downwind of the rider ahead, allowing them to move considerably faster than a solo rider or small group of riders.

   Feeding station / zone: Terms for areas where riders in mountain bike or road races can pick up both food and liquid refreshments.

   Field sprint: A sprint at the finish among the main group of riders in a road race.

   Flyer: A surprise attack, usually by a solo rider.

   Force the pace: To increase speed to make the group to go faster.

   Gregario: A team rider who will sacrifice his / her individual performance to help a designated team-mate.

   Highside: Being thrown from the bicycle in a direction counter to the turn.

   Hook: To suddenly move one's back wheel to the side, forcing the following rider to slow down to avoid running into it.

   Jump: A quick acceleration which usually develops into a sprint.

   Kick: A burst of acceleration for the final sprint.

   Lap: One loop of the track, course or circuit.

   Lapped: A rider who has fallen behind another rider by one lap of the track, course or circuit is said to have been lapped.

   Lead-out: A racing tactic whereby one rider races at high speed to give a head start to the rider on his /her wheel.

   Mass start: A race start in which all racers start at the same time.

   Mechanical: Slang for a mechanical problem with the bicycle.

   Neutral support: The support given to a rider by a neutral party, i.e. a mechanic in a follow vehicle.

   Off-camber: A curve in the trail that throws riders to the outside of the turn.

   Paceline: A string of riders that moves at high speed with each individual taking turns setting the pace and riding in the draft of the others.

   Pedal clearance: The amount of lean angle a bicycle can have without digging a pedal; also known as "cornering clearance" or "road clearance".

   Peloton: The main group of riders; also called the pack, bunch or field.

   Pits: Stations along the course where repairs can be made.

   Pull: To take a turn at the front of the group, maintaining the same speed of the group.

   Road clearance: The amount of lean angle a bicycle can have without digging a pedal; also known as cornering clearance or pedal clearance.

   Rock dodge: To steer the handlebars quickly to one side to avoid small road hazards.

   Sitting in: Drafting, or sitting closely behind the rider immediately in front.

   Slipstream: The area of least wind resistance behind a rider.

   Snakebite: The most common type of flat tyre, caused by hitting an obstacle so hard that the innertube is pinched against the rim.

   Spokes: The arms inside a wheel rim.

   Sprint: 1. a high-speed race, usually over a short distance. 2. the final high-speed dash for the finish line in race of any distance.

   Time trial: A race in which riders start individually and race against the clock.

Credit: IOC

For further info., please visit http://www.olympic.org/uk/sports/programme/disciplines_uk.asp?DiscCode=CR.