Polo Bikes

Hub gears are awesome.
But how the deuce do you work out the GI?

Sheldon tells me the gear percentage, but I'd like to know exactly what gears I have going on.

Shimano Nexus 7-speed hub Gear Ratios
The overall range is 244%, in jumps of:
1st 17.2% 2nd 13.8% 3rd 17.3% 4th 15.8% 5th 16.6% 6th 15.7% 7th

you use the sheldon brown calculator
http://www.sheldonbrown.com/gears/internal.html

just out in 1 chaining and 1 sprocket, select the hub and click calculate