Opinions Please
 

I'm getting a wheelset built up for me, Velocity Deep V (Teak) and a Mavic Open Pro. Should the v be on the back or front? I figured back so it dosen't take as much damage and i'm going to be running a front brake for a bit and it has no machined sidewalls.

Brakes aside though, if i was running none, would you put the Deep V on the back or front?

I am new to fixed gear and i will be running a flip flop hub incase i'm not satisfied, what is the average size of cog i need? What's the differences between the sizes? 15t to 19t, i don't know what i would rather.

Freewheel?

Back, becasue of the brake issue. Brakes will scuff up a non-machined rim and it'll look like poop.

You want to shoot for about 70 gear inches. This should get you started: http://www.sheldonbrown.com/gears/

The difference is 4 teeth.

If it's a flip/flop hub you can run this too but if you are like many people on this forum, once you ride fixed you'll never want to flip the wheel around to freewheel again. YMMV.

if it's fixed and i skid, that dosen't effect the rim only the tire, right? so then yes, back would be correct for the deep v.

and my chainwheel is quite large, but it's welded to my crank arm, so i'm not switching it out just yet, but it has 52teeth, so i should be running a 17t cog with the 52t chainwheel?

To calculate gear inches I'd need to know your crank arm length, rim size, tire size, as well as chainring teeth #. That calculator I posted a link to will help you make the calculations based on your setup.