I'll tell you what I learnt last year. I have a Heckler and a Soul. I took the soul and it was perfect, the Heckler would have been too heavy for the requirement. Ups are generally fireroad with the exception of 2 (that I can remember) singletrack climbs - most were walking up, so you would inevitably get stuck behind them. The climbs are long, the descents are very good, rocky, with gulleys sometimes, and some towards the end slippy and slidey, but considering the length of the climbs, relatively very short. So you want something that favours the climbs. I also had far to heavy a backpack with bladder. It gave me backache. This time I will be going light with a simple tool kit, a few energy bars/gels and a water bottle. The fuel stop is about 2/3rds through, but has lots of food and drink. Tyres, I used Conti XKings last year, tubeless. Front was fine (2.4), back (2.2) split after me hairing down a rocky descent about 1/3 of way in. I'm taking a Nobby Nic snakeskin DD (2.4) this time on the back.