everyone I know who has done it, has done it on a gravel bike. I think the corrieyairick pass would probably benefit from a MTB on the way down but it's def doable (from what I gather) on a gravel bike
Wind is best going south to North but you'd have probably do more walking because of steepness/roughness. Did it on a mountain bike and friend had gravel, I'd probably take mountain bike but either are fine
everyone I know who has done it, has done it on a gravel bike. I think the corrieyairick pass would probably benefit from a MTB on the way down but it's def doable (from what I gather) on a gravel bike