Replacement For - Bicycle Seat Post Adapter Inner Diameter: 30.9mm/ 1.22", Outer Diameter: 31.6mm/ 1.24"
Function - By using a seat tube seat post reducer, the need to replace a seat post due to a mismatched seat post diameter can be avoided, thus saving the cost of replacing the seat post.
Material - The bicycle seat tube reducer sleeve is machined from aluminum alloy.
Installation - Installing it is simple, requires no additional tools, and is convenient for you.