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Cyclists are given a classification depending on the type and extent of their disability. The classification system allows cyclists to compete against others with a similar level of function. At the
2008 Summer Paralympics and earlier, classes were: • B&VI 1–3: Cyclists with a
visual impairment, using a
tandem bicycle • LC 1–4: Cyclists with a locomotor disability, including those with amputations • CP 1–4: Cyclists with
cerebral palsy, using a
tricycle (CP 1–2) or bicycle (CP 3–4) • HC A, B, and C: Cyclists using a
handcycle At the
2012 Summer Paralympics, a functional
para-cycling classification system was used. • B: Cyclists with a vision impairment, using a tandem bicycle • T 1–2: Cyclists with cerebral palsy,
MS or similar
neuro-motor impairment, using a tricycle • C 1–5: Cyclists with amputations, neuromotor or musculoskeletal impairment, using a bicycle • H 1–4: Cyclists using a handcycle As a rule, because of the nature of the machine, tricycle racing and handbike racing does not take place in the velodrome, although both tandem and standard bicycles can be used there. With that restriction, generally every class will have four possible individual events to compete in - a road race and extended road time trial, a track time trial of between 500 and 100 metres and a pursuit between 3000 and 4000 metres. In addition, there are a number of team events; a mixed handbike relays on the road, and a mixed team sprint on the track. ==Factoring==