How do you work out gear inches?

Just wondering really.
I have a stock bowery (46x17) and it feels a bit under geared.
what is the magic formula for calculating the gear inchage?

Use this.

http://software.bareknucklebrigade.com/

here

what they said

snap - good stuff.

cheers peeps!

simplest method in mental arithmetic is to divide chainwheel teeth by rear cog teeth then times wheelsize
ie: 48t chainwheel divided by 17t sprocket times 27" wheel = 76 inches

here:
http://home.i1.net/~dwolfe/gerz/index.html

simple table rather than complicated calculation

I use a scalpel or other sharp blade and wiggle it until it pops out. Be sure to fill the hole it left with a decent glue (super glue works well).

also :

46 x 17 is not undergeared! stick with it!

simplest method in mental arithmetic is to divide chainwheel teeth by rear cog teeth then times wheelsize
ie: 48t chainwheel divided by 17t sprocket times 27" wheel = 76 inches

Ha! Mental arithmetic...48/17x27 = erm, errr, erm.

also :

46 x 17 is not undergeared! stick with it!

Spin to win!

simplest method in mental arithmetic is to divide chainwheel teeth by rear cog teeth then times wheelsize
ie: 48t chainwheel divided by 17t sprocket times 27" wheel = 76 inches
or 26.5 for 700c