Originally Posted by
LarDasse74
Oh... and tires... new tires that are better quality or better suited for the riding you are doing are the best performance upgrade you can make for the money
Try ProBikeKit, they have very good prices for tires and free shipping to the US. My last order arrived within a week. People seem to like the Michelin ProRace3's and the Conti 4000's.
And you are in luck with the shifters because they CAN be serviced/rebuilt, unlike Shimano. It's likely you won't have to replace them.