Handlebar Shim Spacer (Pair) Red Aluminum Alloy Key benefits Improves fit and safety by converting bar diameter from 4 mm to 31.8 mm, enabling secure clamping in standard handlebars Provides a quick, practical solution when adapting components to a different tube size Enhances safety and longevity with a durable aluminum alloy construction compared with plastic alternatives Simple installation Quick and easy to install: buckle the shims in the handlebar installation position Lets you change the round tube size to 8 mm with minimal effort Durable and reliable Made from aluminum alloy for a firmer, more secure lock than plastic materials Longer lifespan helps maintain performance and safety over time Specifications Material: Aluminum Alloy Color: Red Quantity: Pair 23 use scenarios Scenario 1: Upgrading components on a handlebar system that uses a 31.8 mm clamp, while the existing tube is 4 mm in diameter Scenario 2: Quick field adaptation of a handlebar setup to accommodate a different round tube specification, preserving a secure fit Scenario 3: Routine maintenance or modification where a robust, longlasting shim is preferred over plastic spacers for added safety