Unable to shift to the large cog on my crankset sprockets
Heya folks, discovered this forum whilst searching for advice on fixing my bike dilemma.
Basically, my bike refuses to shift the chain to the large cog wheel on my crankset chainrings. The front derailleur looks fine, I think it is moving as it should when i upshift and/or downshift (I think it is, I don't really know what i'm doing when it comes to bicycle repairs and maintenance :<), but the chain isn't moving as it should. The chain is only alternating between the small cog and the middle cog when i shift gears via my front derailleur =/ What's wrong with it, and how do i go about fixing it?
P.S. Not sure if i have the tools to fix it....I just have a screwdriver. I brought an Allen wrench home from london yesterday from my sister's flat, but I can't remember where I put it! >_<