Photo 1 of Bicycle Jockey Wheel Bearing Pulley Bicycle Tension Rear Derailleur for Road Mountain Bike (Black?11T or 13T?)

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Photo 1 of Bicycle Jockey Wheel Bearing Pulley Bicycle Tension Rear Derailleur for Road Mountain Bike (Black?11T or 13T?)Photo 2 of Bicycle Jockey Wheel Bearing Pulley Bicycle Tension Rear Derailleur for Road Mountain Bike (Black?11T or 13T?)