The l60a unified saddle and post along with a mid sealed bearing bb set the l60 apart from the l40 providing added durability at your feet while shaving off some weight a hi ten frame and fork along with an under mounted rear u brake and 25x9 gearing on an 8 spline bb and 14mm rear axle round out the package fully built tuned and testedeach bike is fully built tested and tuned by wiggle39s team of qualified bike mechanics to ensure you39re bike arrives in perfect condition to find out