SLF Motion might be a relative newcomer to the oversized pulley world, but don’t let that fool you. Owner/founder Blake Young has been at it for a while now, and back in 2016 SLF had one of the fastest 11-tooth pulley sets on the market. Blake tells us that the 11-Tooth Hyper Pulley wheels were independently tested by Friction Facts to have 48% less friction than the next closest competitor.
Now, SLF Motion is back with a complete pulley system – the Hyper Speed System. Using an oversized CNC machined titanium 16t upper and 17t lower pulley wheel, the system includes a custom derailleur cage machined from 7075 aluminum. All hardware is either stainless steel or titanium.
What’s the benefit to the system? In a word – friction. Or lack of it. In the demo above the same bike with the Hyper Speed System installed seems to spin forever, with so little drivetrain drag that the freehub actually pushes the crank and chain around.
Hyper Speed Systems start at $445 with a black or silver cage and uncoated (silver) titanium pulleys. For an additional $40 you can add black or gold coating to the wheels. Cages are offered in both Shimano and SRAM fitments with the Shimano 679 model for 6000, 7000, and 9000 series derailleurs, the upcoming 891 for Shimano 8000 and 9100 series derailleurs, and versions for both SRAM mechanical and ETAP rear derailleurs.
All SLF motion products are designed, tested, and hand assembled in Pawnee , Illinois.