Bought a new Trek 3900 disc from my local bike shop over 3 weeks ago but havnt had much time to ride it until recently. Went out for my first proper ride yest and my gears are becominging increasingly hard to work with. Not used to my new ones yet (previous bike gripshift gears lol) but cant see what im doing worng, riding on middle cog, but any gears but 1,2, 7,8 are pretty much unridable. Is it something i can sort myself? Wondering if the LBS will take a look at it after nearly a month since the sale?
Help appreciated
Help appreciated