Shimano deore m6000 10sp mtb double chainsetthe deore m6000 10sp mtb double chainset from shimano incorporates the technology of shimano's top chainsets, but without breaking the bank. Benefiting from the durable and smooth power of the two piece hollowtech iirdquo bottom bracket system, and ldquodyna sysrdquo chainrings, you know you're in good hands. No matter what the trail, you'll be able to shift with ease and tackle the toughest route. Features material crank arm aluminium outer chainring aluminium inner chainring glass fibre steel speed 2 x 10 speed axle profile hollowtech ii bcd 96 64mm, 4 arm asymmetrical recommended chain hg x 10 speed chainline 48.8mm optimised gear combinations and ratios for trail riding designed for an external bottom bracket system that is lightweight and incredibly strong lightweight and rigid steel bottom bracket axle smooth shifting rhythm maintains speed and acceleration over challenging terrain close step tooth profile for smooth shifting stable shifting performance in any suspension position single spike structure for stable shifting dyna sys compatible bottom bracket not includedtechnologieshollowtech ii the concept of hollowtech ii technology is focused on producing a superior crankset, which will maximise a riders power transfer. The rigidity of the crankset ensures pedalling efficiency while its low weight, a key element of the crankset, aids in cycling longer distances. Naturally, shimano strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. For most frames, hollowtech ii with its 24mm axle can set the bearing position outside of the frame to provide better weight distribution and more stability. Hollowtech ii bottom brackets also have high precision seals to increase durability, maintaining excellent rotating performance for long periods.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.