Key benefits Versatile compatibility for seat posts: size options from 2 mm to 33.9 mm accommodate a wide range of seat post diameters. Durable and reliable: made from 6061 aluminum alloy for strength and long lasting use. Suitable length for flexible setups: 100 mm length provides a stable adapter. Easy installation: designed for straightforward installation on bicycles with different seat post sizes. Secure and stable connection: ensures a reliable fit across various bicycle configurations. Specifications Material: 6061 aluminum alloy Length: 100 mm Size range: 2 mm to 33.9 mm Type: seat tube reducer for bicycles Application: for bicycles with different seat post sizes Use scenarios Scenario 1: You upgrade or a seat post and need to accommodate a different diameter than the frame seat tube. Scenario 2: A bike or rental service with mixed seat post sizes uses reducers to provide quick, secure fits across models. Scenario 3: Maintenance or projects requiring flexibility to reuse seat posts on multiple bicycles.