[TIRE WEDGIE 裝後輪神器] 兩件式3D列印楔形滑塊系統用來輔助後輪置中於車架，並同時調整鍊條張力。幫助於鎖緊螺絲/螺帽的同時維持輪胎置中，輕鬆又省力。適用於各類型BMX自行車並幫助解決後輪間隙過小及置中問題。 由美國科羅拉多州Wooder Designs設計公司，主理人Kevin Reed本身也是位BMX車手，為了解決裝煞車輪胎間隙過小難調整的問題而想出這個點子，造福許多BMX車店與公司快速修理組裝後輪! 簡單的設計卻解決長久以來BMX最令人頭痛的問題，今後自己裝後輪再也不求人！ 3D printed two-piece wedge system that helps center the tire relative to the frame and simultaneously tensioning the chain. Holds the wheel straight as you tighten the axle nuts. Simple and easy. Made primarily for BMX bikes with tight gaps between ti