Performance and reliability ism 4d machined rim is lighter without compromising on strength consisting of 24 beefy zicral spokes with isopulse lacing to the rear ensure stiffness and responsiveness high tech iconic wheel tyre system includes the core mavic alloy technologies fore ust ism4d zicral with a wider 22mm hookless profile rim to produce increased comfort control and traction ist 4 by using 4 pawls working 2 by 2 instant transfer system 4 provides a dynamic ride thanks to its