You can know the specifications of the reducer sleeve. How to choose.
To 28.6 Seat Post Tube Shim Conversion Sleeve Seat Tube Reducer Reducing Sleeve
A ABSOPRO Bike Seat Tube 31.6 to 33.9mm Bike Seat Post Tube Adapter Sleeve
Bike Seat Post Adapter Shim Seat Post Adapter Bicycle Seat Tube Conversion Sleeve 27.2mm to 30.9mm Aluminum Alloy for Road Mountain Bike
YELARXI Bicycle Seat Post Adapter Shim, 27.2 to 30.0 mm & Alloy & Black & 1 Pack Bike Seat Tube Seat Post-Fitting for (Outdoor/Mountain/Road/City Bike/Electric Bicycle)
YELARXI Bicycle Seat Post Adapter Shim, 22.2 to 25.4 mm & Alloy & Black & 1 Pack Bike Seat Tube Seat Post-Fitting for (Outdoor/Mountain/Road/City Bike/Electric Bicycle)
YELARXI Bicycle Seat Post Adapter Shim, 30.9 to 31.6 mm & Alloy & Black & 1 Pack Bike Seat Tube Seat Post-Fitting for (Outdoor/Mountain/Road/City Bike/Electric Bicycle)
