Mountain bikers with SRAM 12 speed derailleurs whose pulleys are worn, noisy or gritty.
When your derailleur pulleys wear, shifting gets noisy and the chain is more likely to jump on rough trails. The BBB RollerBoys BDP-07 is a replacement pair sized 12T and 14T for SRAM 12 speed MTB rear derailleurs.
Both pulleys use a narrow-wide tooth profile for strong chain retention, and spin on sealed bearings to keep out mud and water. The body is an EMS Swiss composite with 40% glass fibre, tough and hard-wearing.
A simple, good-value way to bring a worn 12 speed drivetrain back to quiet, positive shifting.
12T and 14T
Sized for SRAM 12 speed MTB derailleurs.
Narrow-wide
Better chain retention on rough ground.
Sealed bearings
Keeps muck out.
Tough composite
40% glass fibre EMS Swiss material.
Pulleys
Compatibility
Narrow-wide teeth
Alternating tooth widths grip the chain for better retention on rough ground.
Glass-fibre composite
EMS Swiss composite with 40% glass fibre for strength and wear resistance.
Great for
Maybe not for
Made for SRAM 12 speed mountain bike rear derailleurs using 12T and 14T pulleys. Check which pulley size goes in the upper and lower positions on your derailleur before you remove the old ones.
Keep the order
Note which pulley is upper and which is lower, and keep any washers in the same order. Swap one at a time to avoid mix-ups.
Tighten carefully
Pulley bolts are small and thread into alloy. Use a torque wrench to the value printed on the derailleur, and a dab of threadlocker.
Parts and accessories from the Netherlands.
BBB is a Dutch parts and accessories brand making everything from pulleys and brake pads to lights, tools and clothing.
