SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET trek kids 1 x SRAM X0/GX Transmission

1 x SRAM X0/GX Transmission Pulley Set

1 x C-Preme Krash FS Youth Unisize 54-58cm Helmet

Three-point Velcro® strap attachment

Three different height adjustment

SHIMANO DURA ACE BB-R9100 ITA HOLLOWTECH II BOTTOM BRACKET trek kids 1 x SRAM X0/GX TransmissionThe SHIMANO BB R9100 DURA ACE HOLLOWTECH II bottom bracket delivers precision engineering for the FC R9100 crankset. Featuring M36 x 24T Italian thread cups, this component combines lightweight construction with exceptional stiffness for competitive performance. The HollowTech II design ensures smooth, efficient power transfer with minimal friction. Compatible with frames using Italian threaded bottom bracket shells. Requires TLFC34 or TLFC24 tool