Bicycle gears

Numéro d’image : 11821883
Bicycle gears
Bicycle gears. Rear cogs for a bicycle gearing system,with the gear-changing mechanism (lower centre). The rear wheel spokes are also seen. The chain is wrapped over one of the cogs and through the gear-changing mechanism. The other end of the chain (not seen) is wrapped around the front cogs which are driven by the bicycle pedals (not seen). Turning the pedals rotates the front cogs,moving the chain and rotating the rear cogs,which then rotates the rear wheel and causes the bicycle to move. The different size cogs (6 at the rear,3 at the front) allow 18 gears for different numbers of pedal rotations for one wheel rotation. Different gears are used for steep and flat roads
Licence : Droits gérés
Crédit: Science Photo Library / Molloy, Cordelia
Taille de l’image : 3597 px × 4899 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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