Shimano deore bb52 hollowtech ii bottom bracketnow bringing you even an even better seal than previous deore models, the shimano deore bb52 mountain bike bottom bracket offers better durability and smooth performance. Also suitable for use on city and road bikes, it can also operate with other chainset brands that feature spindles that are 24mm in diameter.features  type english thread   width for 68 or 73mm wide bb shells     compatible with fc t551, fc t611, fc m552, fc m590, fc m610, fc m612, fc m615, fc m622, fc m625, fc m640, fc m645  designed for use chainsets with 24mm spindles  durable     smooth rotation  manufacturer's reference code bb52b      weight 100g approxa 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.