• NEW Shimano XTR MTB BB-UN91 Italian-Thread cartridge sealed bearing bottom bracket, in original box. 
• Square taper axle.
• Italian threads, fits 70mm bb shells, triple MTB cranks and has a 113mm axle.
• Complete and ready to use.
• Made in Japan quality from 1993.
• 8.5oz./243 grams.
• BB574.
• FREE shipping in the USA.