Features: *Steerer Tube Adapter:Made of toughened aluminium alloy, this adapter is designed to convert from all tapered fork frames to accepted 1-1/8inch straight steering tube forks. *Versatile C Base Type:Can be used alone, featuring a taper base with options for 52, 55 or 56mm open base, compatible with 1.5inch(39.8mm) taper front forks. *Convenient D Base Type:Conestraight pipe design makes it suitable for general-purpose use, allowing compatibility with 1.125inch(28.6mm) straight pipe front forks. *Effortless Installation:With its user-friendly design, this steerer tube adapter provides a seamless and hassle-free installation process. *Package Content:You will receive a steerer tube adapter only, C base type or D base type for you to choose, others shown in the picture are for demonstration. Specifications: *Product Name:Steerer Headtube Reducer *Material:Aluminium Alloy *Types:C,D *Size:Approx.C,D(Size*Thick-ness) C:1.5inch D:1.125inch+1.5inch *Thick-ness:About 5 mm *Angle:45 degree *Weight:Approx.C,D C:6.5g D:12.7g *Color:Black Package Content: 1 * Steerer Headtube Reducer Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. 【Aluminium Alloy Steerer Tube Adapter】Made of toughened aluminium alloy, this adapter is designed to convert from all tapered fork frames to accepted 1-1/8inch straight steering tube forks. 【C Base Type with Options】Can be used alone, featuring a taper base with options for 52, 55 or 56mm open base, compatible with 5inch(39.8mm) taper front forks. 【Convenient D Base Type】Conestraight pipe design makes it suitable for general-purpose use, allowing compatibility with 125inch(28.6mm) straight pipe front forks. 【Effortless Installation】With its user-friendly design, this steerer tube adapter provides a seamless and hassle-free installation process. 【Package Content】You will receive a steerer tube adapter only, C base type or D base type to choose, others shown in the picture are for demonstration.