Fixed-gear bicycle

(Also called " rigid hub " or " rigid motion " ) The term rigid transition comes from the cycling and referred to the absence of a freewheel on a bicycle. Bicycles without freewheel are usually used in railway and art cycling and the cycle ball, but also for training purposes on the road.

In art, the rigid cycling gear allows the reverse. In track cycling, where racing wheels with rigid gear are used, the usual road racing racing wheels are not permitted. The rigid gear is still often used in Training methodological reasons (forced too high cadence, better controllability of the steady propulsion = "Round Kick ") in the preparation period and on the road today. In the road race, he is, however, not admitted.

The absence of a free-wheel has nothing to do with the number of gears - only one derailleur is inherently impossible. So a Eingangrad does not have a rigid gait, conversely, a rigid gear is in principle also possible with several courses.

Until the 1950s, there were rear hubs that could be used on the track and the road. They had on one side a rigid transition and on the other a 3-fold sprocket with freewheel. The rear hubs used until the 1980s could be converted to rigid transition without much trouble, because the freewheel was integrated into the sprocket. The ring gear together with freewheel could therefore easily be replaced with a rigid pinion. With the advent of integrated into the hub freewheel this simple possibility no longer exists. The use of the rigid gear on the road is only using appropriate hubs, mostly wheel hubs possible. Meanwhile hubs are commercially available, which either the rigid gear or freewheel can be realized. One version is a type of flip-flop hub, wherein on each side of a pinion is mounted, and a side of the rigid gear and the other side has the freewheel. To switch between the rigid gear and freewheel the rear wheel must be removed and turned back to be installed. The other version is a hub of the manufacturer SRAM. In this "SRAM Torpedo Singlespeed " to switch between the freewheel and rigid gear to the hub by means of a screwdriver. Switching while driving is not provided for safety purpose.