The gear ratio on my Bosch CX / Nuvinci with a Gates carbon belt is a bit too low for me (I believe it is 26 front to 24 back). How difficult would it be to change out the front / rear sprockets? If I am not mistaken I need something larger in the front to gain more top end speed? The bike in question is R&M Tinker. Will I need a longer belt as well? From the Gates site I see that 28 front is available. How do I calculate the teeth number for the belt? And will going up 2 teeth in the front make that much of a difference? Any help is appreciated.