For BromptonWheel Diameter:55-61mmThe Main Body Is Expandable, Compatible With a Variety Of Frame Types, And The Installation Tightness Is Improved. The Extended Built-In Telescopic Rod Can Improve The Stability Of The Bike Center Of Gravity When Pushing, And It Is Not Easy To Tilt.This Product Is Made Of Aluminum Alloy Material And Processed By Cnc Technology. The Product Is Lightweight And Has Improved Strength. It Has a Hollow Design, Exquisite Workmanship.Easy Wheel Rims Are Enlarged And Widened, Anti-Slip And Good Passability. The Heightened Design Does Not Need To Worry About The Shock Absorber Scraping The Ground Due To The Small Diameter Of The Easy Wheel.colour: silverMaterial: Aluminum AlloySize: 144x61x61mmPackage Contents:1 x Extension rod1 x Easy wheelOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.