Hi everyone. I'm a bit of a dope on mechanics outside of the very basics. Essentially I am upgrading a hybrid bike (GT Nomad) with better components as I wear them out. I've got about 2200 miles on the old girl and it's time for a new crank and chainrings. The ones on there that came with the bike are cheapo pressed deals. I want to get some better ones. The bike is a 21 speed. About 3 years old.Here are my questions:
I would like to put on a MTB crankset for the lower gearing. Currently I think it's configured as a road triple. Will there be any issues with going MTB crankset?
Will I need a BB that matches up with the new crankset? Or are they sort of standard.
When I look at cranksets on the net, they say: 9 speed (for example). How will this work (or will it) with my 7x3 setup?