The race face next sl 1011 speed crank arms are the lightest production carbon cranks on the planet constructed with us sourced carbon and aluminium the next sl combines proven race face proprietary hollow arm technology with the all new lsquocinchrsquo interface the race face crank arms offer you interchangeable spiders limitless ring combinations a 30mm alloy spindle and compatibility across all relevant frame standards these crank arms have been designed completely hollow with all