Need help designing a gear

[iridebmx]

Im not familiar with the options for creating gears. I need some advice on making a 25 tooth chainwheel for a bike.

the teeth are 1/8"
the bore is 15/16"

http://www.danscomp.com/458084.php?cat=PARTS here is an example of the size i need but im going to add some machining into it.

what are all the terms like pitch and so on?

Thank you.

[CustomGearManufacturer]

Check out Gear Motions for spur gears and other custom gears. (http://www.gearmotions.com/capabilities/spur-gears.php
). You can also ask them questions right on their site, they have always been very helpful for me when I have worked with them.

[Tech2]

You can design your own sprocket in the eMachineShop CAD - you just have to draw the desired tooth shape.