The Shimano SM-AD91 Clamp Band Unit is designed for frames without braze-on hangers and is compatible with both Di2 and mechanical derailleurs. Featuring a built-in aluminum plate, it stabilizes the derailleur during gear changes, protecting your bike frame from potential damage. Available in 31.8mm and 28.6mm sizes, this clamp ensures secure and reliable shifting performance. Essential for maintaining drivetrain integrity and extending the life of your bicycle components.

Every Day Free Shipping: Joe Mamma offers free shipping on all Canadian orders over $200 excluding complete bicycles and trainers. Customers are also welcome to pick up their orders in store at no charge, you can opt to do so at checkout (please await your order completion notice before coming to pick up your order). 

Shipping Policy: Orders will be shipped as soon as possible, customers will be notified if any delay should occur. If one part of your order is unavailable at time of order, your order may be fulfilled with multiple packages. Shipping charges are non-refundable. International clients please note that customs or brokerage fees are the sole responsibility of the purchaser.

Joe Mamma Cycles ships to both Canada & the USA! We use Canada Post, UPS & Fedex to get you the best price & use recycled packaging to reduce our environmental impact.