yeah, wouldn't expect to spend more than $30 on a simple cog (you can get a Dura Ace NJS for that price).^thanks for the quick reply my dude!
i'll check out my local bike shop for a 17t cog then if this ratio doesn't work out for me.
they should all be generally cheap right?
it's worthwhile to note the width of your drivetrain components though. it'll likely be either 3/32" (commonly found in single-speed freewheel) or 1/8" (track oriented). can sometimes mix and match widths without issue, but it's generally preferred to have a chainring, chain, and cog with matching widths to minimize lateral 'play' in your drivetrain.