Drive arrangement for a bicycle and tool
AssigneeSRAM Deutschland GmbH
InventorsHENRIK BRAEDT, MATTHIAS REINBOLD, ROBERT BOEHM, SEBASTIAN REINEKE, LUIS MIGUEL MENDES FIGUEIREDO
Life of this patent
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Abstract
A drive arrangement for a bicycle may include a plurality of sprockets arranged at a rear wheel of the bicycle. The sprockets may be particularly arranged to have a spacing that facilitates the configuration of an increasing number of sprockets in the plurality of sprockets. A singular front sprocket or chainring may be used to drive the rear plurality of sprockets. A particularly configured tool may be used to configure the drive arrangement.
Claims21
A drive arrangement for a bicycle, comprising
- a chain;
- a front sprocket which is rotatable about a sprocket axis and has a multiplicity of teeth which are constructed for engagement with the chain;
- a rear wheel sprocket arrangement rotatable about a sprocket rotation axis and comprising a plurality of sprockets which are coaxial with respect to the sprocket rotation axis, the plurality of sprockets arranged with axial spacing from each other and having different numbers of teeth which are constructed for engagement with the chain,
- wherein the sprocket arrangement has a gear range quotient which is formed by division of the number of teeth of the sprocket having the largest diameter by the number of teeth of the sprocket having the smallest diameter, and has a packing density quotient which is formed by division of a number of sprockets in the sprocket arrangement by the axial spacing of axially outermost sprockets from each other measured in millimeters, and
- wherein the sprocket arrangement has a gear range packing coefficient, formed from a product of the gear range quotient and the packing density quotient, is greater than 1.25;
- and
- a rear derailleur.
An apparatus for setting a predetermined, drive-arrangement-specific distance between a sprocket-closer chain-guiding roller of a rear derailleur and a largest sprocket of a rear wheel sprocket arrangement of a drive arrangement for a bicycle, the apparatus comprising:
- a first marking for applying to an outer circumference of the sprocket-closer chain-guiding roller, and
- a second marking for applying to an outer circumference of the largest sprocket of a bicycle rear wheel sprocket arrangement,
- wherein the first marking is designed as a circular segment which corresponds to at least one part of the outer circumference of the sprocket-closer chain-guiding roller.
Dependencies are inferred from the claim text.