This Hayden Eccentric Tandem Bottom Bracket is a high-quality option for any tandem bike or tandem tricycle. It features a Square Taper - ISO spindle type and is made of durable alloy material. The included Campagnolo Athena BB ensures a smooth and reliable ride. This bottom bracket is compatible with a variety of bike types and comes in a sleek silver color. With its easy-to-install eccentric bottom bracket shell type, this part is a must-have for any serious cyclist. Add this Hayden Eccentric Tandem Bottom Bracket to your bike today for optimal performance.