X101 single speed chain robust chain for 30 more strength our patented sl x technology keeps the grease where it belongs in the chains bearings resulting in a longer life unique stretch proof treatment has effectively enhanced the durability by reducing the attrition between the inner plates and pin the x bridge is configured with precisely articulated angles for quicker and smoother gear shifting 12 x 18 112 links pin length 10 0 mm compatible with track single speed brass plate