jnb said:
OK slightly revised question ...
How much does your bike cost you in consumables; chains, tyres, tubes, etc.?
Actually not very much (and would cost a lot less if I bought cheaper bits).
The following bits typically last me about 5000 miles or one year's worth of riding:
* Tyres (I typically budget £30 each but you can get reasonable ones for half that)
* Chain (cheap chains are a poor economy: About £25-30)
* Cables (cheap ones are probably equally good but I buy Campag at £20 a set)
* Brake blocks (£12 a set)
The following last about 2500 miles:
* Bar tape (about £10)
* Tubes (£2.50 each in reasonable quantity)
Additionally a £5 bottle of chain lube lasts about 5000 miles.
I'm going to go slightly into the realms of guesswork here and guess lifetimes:
* Cassette: 15,000 miles;
* Chainset: 30,000 miles;
* Rear derailleur: 30,000 miles;
* Front derailleur: 50,000 miles;
* Bottom bracket: 100,000 miles;
Based on that guesswork, and Campagnolo current pricing for Centaur level components that comes out at just over 4 pence per mile or £42.11 per thousand miles. Obviously you don't need to buy Centaur level kit, in which case you could probably halve it (or you could buy Super Record, in which case you could more than double it).
So my consumables budget is probably no more than £200 per year. I still spend more than a thousand pounds a year, on average, on my bikes!
Disclaimer: if you use a mountain bike in proper mountain bike conditions, expect things to last very much less long - not because the components are poor quality but because the conditions both in terms of dirt and in terms of the treatment the gear gets is very much more demanding.