I currently use my Trek mountain bike on the road only and intend to try and make it as fast as possible. As much as I would like to, I don't intend to purchase a road bike as i've poured enough money into this bike which will go to waste (and i've done a lot of miles on it and will not part with it). I currently run a pair of Specialized Nimbus 26x1.5 mbr slick/road tyres which are pumped up to 75-80psi which I believe are pretty much the max. I was thinking of changing these to some Specialized All condition pro 26x1.0 road tyres which are obviously thinner and possibly lighter and they apparently inflate to over 100psi. Do you think this is worth the improvement over the 1.5s?
The front chainring is a Shimano Deore with the largest outer ring being a 44T and the rear cassette has a minimum of 11T. Is it possible to change just the top outer ring on the front chainset to a 48T? Will this mess up the front derailer configuration bearing in mind the other 2 chainrings (inner and middle) will be 22T and 32T? or am i better off changing the whole chainset (and maybe the bb to hollowtech as I can't find a square tapered 48T chainset anywhere) with proper 48T-36T-26T setup? Is this upgrade actually worth it for the extra 4 teeth gain (i know road bikes have 50+ teeth)?
I may also swap out the air forks (Tora 302s but with no lock out ) to a rigid carbon Bontrager fork but thats the last option on my list.
Many thanks for any input!