I have a recent-ish aluminum frame (actually it's a complete bike) that I don't really use. The components are not really good and it doesn't ride that well. It's currently a triple chainring at the front with a rear 7-speed cassette, some lower-level Shimano.

Could it be converted to an internal gearing system? I'd be happy with just 8 speeds. Or even 3. Insight?

Thank you!