Wheels Manufacturing Seatpost Sizing Gauge

Quick, accurate tool for determining the inside diameter of a bike’s seat tube taking the guesswork out of ordering a replacement.
Made from durable acrylic, this gauge is built to last and sized just right for shop benches, toolboxes, and trailhead tool kits.
Covers 24 common seatpost sizes, from 25mm up to 34.9mm, including all the in-between sizes you’re likely to encounter.
Compact, lightweight, and easy to use.