I just had the chain, rear deraillure, and casette replaced on my bike. How many miles do I need to put on it before I am sure everything is working right, due to the rainy weather and busy schedule. So far all I put on was a little while messing around in the parking lot / my back yard running through gears jumping off deck climbing a fairly steep grass hill ect and a hard three mile road ride in the two small rear cogs that were having the problems. Besides some chain suck in when I shifted from the middle to the small front cog which got better as I rode, the bike worked great. Is that enough to be sure its working right?? I am riding a 12 hour race this saturday and due to a busy work schedule may not have time to ride before I leave early thursday morning for the race. So I hope its good are there any other ways to check it?