Q. The jockey pulley or idler pulley is fixed ?

A
Near the driver pulley on the tension side if the belt
B
Near the driven pulley on the tension side if the belt
C
Near the driver pulley on the slack side if the belt
D
Near the driven pulley on the slack side if the belt
Solution:

The pulleys are known collectively as the jockey wheels or jockey pulleys, the guide pulley is at the top of the pairing (closest to the sprockets) and the tension pulley is at the bottom, taking any slack up from the bike chain as it is fed from one of the chainset’s chain ring.

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