Welcome to our store！</br> 1、[Aluminum Alloy Crank] The crank is forged from high strength aluminum alloy, with widened and thickened edges and corners, which are easy to be stressed without breaking. 2、[Shaft Chromium Molybdenum Steel] Shaft chromium molybdenum steel, the stability of crank and hollow shaft is improved. 3、[External Thread Bearing] External thread bearing center shaft, aluminum alloy outer frame improves rigidity, reduces noise, and is easy to maintain and lubricate. 4、[Stable and No Loosening] Exquisite thread, threaded pair lock, strengthen the stability of the lateral direction, will not loosen, and then there will be no abnormal noise. 5、[Applicability] Suitable for modification of mountain bikes, road bikes, and folding bikes, suitable for crank sprocket 130mm, applicable range of bottom bracket 68-73mm for bottom bracket, bottom bracket thread specification BC1.37-24T. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: Hollow Integrated Crank Material: Main Aluminum Alloy, Shaft Chromium Molybdenum Steel, Bottom Bracket Tube PP Crank Size: Aperture Approx. 170mm / 6.7in Crank Shaft Size: Length Approx. 116mm / 4.6in, Outer Diameter Approx. 24mm / 0.9in Crank Shaft Inner Diameter Thread Specification: M18 Thread Applicable Crank Crankset BCD: Approx. 130mm / 5.1in Bottom Bracket Size: Total Length Approx. 91.5mm / 3.6in, Inner Diameter Approx. 24mm / 0.9in, Outer Diameter Approx. 44.6mm / 1.7in Bottom Bracket Thread Specification: BC1.37in-24T Outer Diameter of Bottom Bracket Thread: Approx. 34mm Bottom Bracket Type: Threaded Scope of Application of the Bottom Bracket: Approx. 68-73mm Bottom Bracket, and the Inbuilt Sealed Bearing Rotates Smoothly <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Right Foot Side Crank (with Shaft) 1 x Left Foot Side Crank 2 x Crank Hole Cover 2 x Crank Fixing Screws 5 x Short Screws 5 x Nut 2 x Bearing&nbsp;Bottom Bracket Lock 1 x Bottom Bracket Sleeve 3 x Bottom Bracket Washer Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>