A lot of the trail is very remote...unless you're going with a group like I did (Bikerpelli), I'd suggest taking a replacement chain.

You may want to consider a folding replacement tire as well.

I see you mention hydration repair kit; I don't see a hydration pack listed, but I'll assume you're taking one. There's no water to speak of, so plan carefully. If you end up taking the Onion Creek road, don't drink it's water. According to the Kokopelli travel guide (which I strongly suggest you purchase at bikerpelli.com), Onion Creek is too polluted from mining operations to even purify the water for drinking.

Good luck. It really is a beautiful area of the country. Stick to the philosophy, "Leave no trace", and enjoy!