That's a new argument against darkside, to me! 
I can't think of any mechanical reason that the type of tire would cause damage to a transmission. Maybe he thinks the extra grip would add extra load to the gears, but that would mean a MC tire slips under the same conditions.
I can't think of any mechanical reason that the type of tire would cause damage to a transmission. Maybe he thinks the extra grip would add extra load to the gears, but that would mean a MC tire slips under the same conditions.