Want to try oversize derailleur pulleys but aren’t ready to disassemble your entire part to swap the cage? The new TRiPEAK Jetstream Pro OSPW kit fits a massive 18-tooth lower pulley into your stock derailleur by using a clever offset axle design.
The pulleys use a machined aluminum hub with a composite toothed idler wheel spinning around it on ceramic bearings. This asymmetric design pushes the pulley forward and up to make room for its larger diameter, letting you get the benefits of a larger pulley without having to severely modify your derailleur.
The larger wheel means shallower chain angles for less wear and friction, and their ceramic bearings spin extremely freely, but…
…it ships with dry bearings, so you’ll love the way they spin out of the box. However, the kit includes a small bottle of light viscosity bearing lube that you’ll need to apply before installing them, and then clean and check them periodically.
The hub has a keyed design to lodge itself into the pulley cage, preventing the center part from spinning inside the cage. Depending on the model, that key might be on the inner or outer side of the cage. And, different models have various tooth profiles – standard or narrow/wide.
Options for most modern 11- and 12-speed SRAM and Shimano derailleurs (road, gravel, mountain bike) are offered in a wide variety of colors.
MSRP is $180 for the kit, which includes a standard-sized upper jockey wheel, also with ceramic bearings, and a 4-year warranty.
