You can know the specifications of the reducer sleeve. How to choose.
A ABSOPRO Bike Seat Tube 31.6 to 33.9mm Bike Seat Post Tube Adapter Sleeve
To 28.6 Seat Post Tube Shim Conversion Sleeve Seat Tube Reducer Reducing 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
Albedel Set of 9 Sizes 100mm Length Bike Seat Post Adapter Shim Seat Post Adapter Bicycle Seat Tube Conversion Sleeve 22.2~33.9mm to 25.4~36mm Aluminum Alloy for Road Mountain Bike MTB
YELARXI Bicycle Seat Post Adapter Shim, 30.9 to 33.9 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, 27.2 to 30.0 mm & Alloy & Black & 1 Pack Bike Seat Tube Seat Post-Fitting for (Outdoor/Mountain/Road/City Bike/Electric Bicycle)
