The stealth outlook and superior braking performance of exalith now available with a wider and light ism4d rim weight 1475 grams pair without tyre low weight and optimized efficiency ism 4d rims maintain low weight while improving aerodynamics 21mm external width 17mm internal gives improved rolling efficiency and comfort optimized responsiveness stiff and strong zicral spokes isopulse lacing to the front and rear for increased wheel stability high grip griplink front tyre low rolling res