Shimano saint m820 mtb cranksetreinforced to meet the demands of modern gravity mtb riders, the saint m820 mountain bike crankset gives you the stiffness and strength you need to attack the trails hard'. '.strtoupper('c')oming complete with a smooth spinning hollowtech ii bottom bracket, these cranks are the ideal addition to your downhill or enduro bike.please note an english thread external hollowtech ii bottom bracket is included.featuresaxle spindle size 24mm suits all shimano hollowtech ii bottom bracketsspeed n a no chainring includedchainline 50.4mm when used with a 68 73mm external bottom bracket shell4 arm crank arm spider 4x104mm bcdchainrings not includedthese industry leading hollowtech ii cold forged hollow crank arms have evolved to increase rigidity, reduce weight, and improve strengthsaint hollowtech ii integrated bottom bracket design uses a wide bearing placement and a large axle diameter for increased stiffness and efficiency combined with longer bearing cup threads for added durabilitysaint m820 series cranksets are dyna sys 10 speed compatible giving the rider more gear combinations whilst maintaining a low weightreinforced pedal and crank arm interface with t nut style steel threaded bushingcrank arm profile gives excellent ankle clearance while increasing rock clearance by removing unneeded material from the end of the crank armmultiple chainring options are available to purchase separately for this single only crankweight 842g with 34t chainring installed, not includedmanufacturer reference codes165mm fcm820a 170mm fcm820c 175mm fcm820etechnologieshollowtech ii a lightweight crankset not only reduces the bikes weight but decreases rotating mass to aid in acceleration'. '.strtoupper('t')he challenge is to reduce the weight of the crank without reducing its strength and rigidity'. '.strtoupper('s')himanos advanced forging technology has solved the problem through the hollowtech ii crank'. '.strtoupper('j')ust like high quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at a very low weight.a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.