Wolf Tooth Sram GXP Direct Mount Revolution Bikes March 6, 2014 Wolftooth Drop Stop Rings Color: Black These can also be used on a BB30 / PF30 long spindle crank set — the 3rd product picture shows you how to determine if you need this ring or the Short Spindle BB30 Direct Mount for SRAM GXP crank. This will replace you existing chain ring and spider. Chain line is 50mm on all rings (on a GXP or BB30 long spindle crank set). All chain rings feature our Drop-Stop tooth design and are made from 7075 Aluminum. Use a 10 or 11 speed chain. The only brand of chain we don’t recommend is Wippermann. Product weights: 26t – 53g, 28t – 60g, 30t – 68g, 32t – 74g, 34t – 83g, 36t – 90g For more information please contact your local dealer. Or us directly from our contact page.