SCIENCE OR COW POOP?
CX Magazine takes a Look at our Pulleys

Aftermarket derailleur pulleys. If you’ve been around a while, you’re probably in one of two schools of thought when thinking about rear derailleur pulleys. One school of thought is that derailleur pulleys is an area ripe for efficiency gains. Some might remember the Bullseye sealed bearing pulleys from a few decades ago, with NMB 6260 sealed cartridge…

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