 Yet the extra weight—and more importantly, rotational inertia—is off the wheel, which therefore accelerates more easily.Advances in tire sealant have made carrying an extra tire a bit outdated.Other advantages of this system include a decreased chance of pinch flats, an ability to operate with a wider range of tyre pressures (from 25 to 200 psi), and increased safety in the event of a flat at high speed because a properly glued on tubular tyre is less likely to roll off the rim.