TRiPEAK's asymmetric Jetstream OSPW kit fits a larger idler pulley inside stock derailleur cages for less friction with less modifications.
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 larger wheel means shallower chain angles for less wear and friction, and their ceramic bearings spin extremely freely, but… 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.
MSRP is $180 for the kit, which includes a standard-sized upper jockey wheel, also with ceramic bearings, and a 4-year warranty.Oh for christ sake, this is depressingly poor engineering. The chain angle increases as the chain goes from one pully to the next , not decreases.I’m not sure i understand your argument, but the angle they are talking about is the angle the links rotate while wrapping around a larger pully diameter . Why these goobers did it this way is a mystery.
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