Image Gwin's e13 rear hub is spaced specifically for a 7-speed cassette. By dropping 3 or 4 cogs, the spoke base can be widened, creating a stronger and stiffer wheel. Credit Dan Hearn Related: UCI Mountain Bike World Cup Downhill PIT BITS Leogang, Austria e*thirteen Cassettes Rear Hubs Aaron Gwin Use keyboard arrow keys to browse the gallery. Swipe to browse the gallery. Prev Next 2 of 36Autoplay Autoplay SlowMedFast Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter sspomer 6/11/2016 3:33pm Share to Facebook Facebook Facebook Share to Twitter Twitter Twitter