BB SOCKET HOLLOWTECH II

BB Socket Hollowtech II engages Shimano® Hollowtech II™ and other 16-notch Ø44 mm external bottom bracket cups, as well as 16-notch disc rotor lockrings and E-Thru axle hubs, for secure, slip-free tool engagement.

Hailing from Taiwan, Birzman elevates cycling tools and accessories into objects of utility and design. Every pump, multi-tool, and bag reflects meticulous attention to function and form. For Indian cyclists, Birzman is the mark of self-sufficiency—gear that turns roadside repairs and fine-tuning into a ritual of craft.

You may request a return only if the product received is damaged, incorrect, or not the right size. In such cases, please email us at support@cobbledclimbs.com within 7 days of receiving your order. Items must be unused and returned in their original packaging, with all tags, labels, and included materials intact. Please note that sale items are not eligible for return, and we follow a no money refund policy on all returns.

All orders are dispatched within 48 hours excluding Sundays and public holidays from the time order is placed. Delivery of your order will be done at the address mentioned by you at the time of placing your order with 3 to 5 days.

All products marked as Sale are offered at final pricing and are not eligible for return, exchange, or refund under any circumstance. We recommend reviewing sizing, product details, and availability before placing your order. For any questions prior to purchase, feel free to reach out at support@cobbledclimbs.com.