I currently have a Trek 1000 that I have been upgrading. Front fork, rims, saddle, seatpost, etc. I now want to know my best options for derailleurs. Currently, the rear and front are the stock Sora models. They are a good system, with some minor hiccups occasionally.
2 things:
What Shimano products will adapt directly, without any incidental modifications, to the triple crank, 8 speed system?
Is there any benefit to going to double crank, 9 speed? I don't find that I use the small chainring, even on steep climbs. This is an issue of cost vs. performance.
Realistic ideas please...