I want to convert my Specalized P.3 to a single speed.

I'm not sure where to start. Anyone have a good guide or advise?

I'd like to know what a good ratio is - right not I have a 32 inthe front with a rock ring, that i'd like to keep.

This bike will be mostly ridden on dirt jumps and skateparks.

Thanks for helping a nubie!

Try Sheldon Brown's sight at Harris Cyclery. It is where I started on the fixed adventure.

So - it looks to my that I may be able to pull off my cassette and get a BMX free wheel, using spacers to get a good chain line.

Will I need a chain tensioner?

I am thinking about going with 32/15, how's that sound?

if you have horizontal dropouts, you won't need a tensioner. if they're vertical, you most likely will.

32/15 sounds pretty ok for dirt jumps and skate parks, afaik.

Have you ever considered a single speed BMX bike for dirt jumps and skateparks. They work way better than Mtn. Bikes.

grunk

the P3 is sort of like a BMX bike...