Neko Mulally won the DH on his freak bike with 32" front wheel w/ XC racing slick. -
https://results.raceroster.com/v3/events/ajsmbwfa6za9y9np - chatting with him at dinner the other night (before the race), all he cared about was rolling speed. cornering knobs were "good enough" and if he could manage the off-camber after the uphill on the course, the rest was basically going straight and fast. seems like his strategy paid off.