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The development of the Hollowtech II crankset took place with a view to optimal and efficient power transmission. Hollowtech technology enables extremely light, hollow crank arms manufactured using Shimano's exclusive forging technology for maximum rigidity. The result is mountain bike components that provide the right setup for almost every biker.The hubs of the new SLX have been specifically designed for performance, reliability and durability under all operating and weather conditions and are equipped with high-quality seals and the proven angular contact conical bearings. The front wheel hubs tip the scales at only 148 g (HB-M7010) and 189 g (HB-M7000). Even the rear wheel hubs are low weight at 357 g (FH-M7010) and 384 g (FH-M7000) respectively. Both front and rear hubs are also available in the wider boost versions with 110 and 148 mm.