Shimano acera m361 triple chainset square tapershimano acera cranksets feature shimanos patented hyperdrive system to provide quiet easy and trouble free shifting please note bottom bracket is not included featuresrings 223242spindle interface type square taper jisspindle length 122 5mmchainring bcd 10464bolt pattern 4 boltcrank fd type mountain triplechain compatibility 78 speedpedal spindle 916crank intended use mountaina 2 year warranty is offered with all shimano products