I had a question for you guys... I have a Bianchi Milano with a 44t chainring and a 20t sprocket in the back. I have to go up steep, steep hills, and I'm not super-athletic at this point (plus my bike and luggage and I are, shall we say, robust), so the low gearing is at times totally inadequate. The high gearing is okay, and I'd prefer more high end than less, but I can survive with lower high-end gearing.
So, what I was wondering is, what do I have to consider to change the rear sprocket?
I think I have about a 30" first gear right now. I don't know a lot about that, but here's a page about Nexus 8 hubs, with a chart at the bottom: http://sheldonbrown.com/nexus8/pages/05.htm I feel like I need at least one and more likely two or more gears below what I have now.
What does this involve? Should I leave it to a bike shop? I read that it could mean I'd have to change the chain length and move the wheel back further. If I pick a bigger rear sprocket, do I have to get a smaller chainring? (Is that super-expensive?)
Hope that isn't too many questions but I'd never thought of changing the rear sprocket before, and it could save me from hurting myself and/or having to buy a new bike in order to ride to work every day