Best solution for Sram BB30/PF30 cranks with short spindle. Spiderless chainrings allow for flawless single speed or Sram 1x9/10/11 drivetrain setup. These chainrings save more than 150g over the regular spider and chainring combo. Reliable, extremely light, stiff and clean looking on the bike. Always use a new chain with a new chainring. Optimized to ride in heavy mud thanks to specially designed chamfers.These spiderless chainrings are designed for Sram BB30/PF30 SHORT spindle cranks. Chainring is flat, as opposed to our GXP model with 6mm offset. Short spindle cranks do have 9mm BB spacer on drive side, where long spindle version has 15mm. If you have long spindle version, then buy our GXP model.