In reply to Nick Smith - UKC:
From personal preference only I run tubeless tyres, but they're not for everyone and realistically don't save much weight. However it means I can run my tyres at pressures around 25-28 PSI and still avoid pinch flats. It is worth noting that I do carry quite a lot, and that tubeless tyres can get punctures so you still need to carry the gear to repair them too, unless you don't mind the walk back. This will almost always mean putting a tube in the tyre.
I also carry a bladder as one my bikes doesn't have bottle mounts either, also bottle being low on the frame can get covered in muck on particularly muddy rides.
As for tools I carry the following:
- A multi tool with a chain breaker in it
- Inner tubes and pump
- Puncture repair kit and tyre levers
- Materials to repair a torn tyre side wall(a toothpaste tube cut open and cleaned and zip ties)
- Spare chain power link/chain pin
- Fork/shock pump
- Spare mech hanger - one day you will catch the mech and twist or break the hanger!
- Spare brake pads
- 8mm spanner
The last one is only because of the hose fixings on my brakes. I managed once to crash and partially unscrew it resulting in brake fluid leaking slowly out of the joint. If I'd of had the spanner I wouldn't of had to abandon the ride due to a lack of front brakes. In other words you'll learn from experience what you want to carry, but the above is my list to date.
I also always carry a front and rear light, pertex jacket, spare jersey/softshell, phone, wallet, map and compass. Often I'll take a GPS too. All the above can fit into a 10 litre bag with careful packing.
Cleaning I just hose the bike off and give it a brush down to loosen encrusted dirt, generally not using any detergents or products, although occasionally I do use car wash and have never had a problem. Just be careful not to get any products on brake pads or discs.
Pre ride I'll often lube the chain and occasionally the fork stanchions if they require it (needs a different product). Other occasional things include re-greasing bearings every few months and adding sealant to my tyres - only because they are tubeless.
As for maintenance books I have a copy of "Zinn and the art of mountain bike maintenance" which seems pretty good. Also the park tools website is useful too.
Once again all of the above is only a personal recommendation so feel free to disagree. The most useful advice I can give though is just head out, have fun and enjoy!