MFOBMX Company developed a new crank system, were the axle is divided in half and becomes an integral part of each arm, the tightening is made inside with just one 8mm allen bolt and a Spliner® Boss with 48 spline that also works as a spacer between the bearings. SPLINER® is a patented system, tested several times during years and approved. Thicker arms than regular cranks and shorter axle to prevent twisting, also the crank shape, was designed to don’t hit the ankles.