OK so I purchased a road bike at a bike shop a few months ago near my university so I could get around faster. I ended up painting my 10 speed, but couldn't figure out how to put my rear derailer back on. I think I lost a few parts because the first time I took it apart, installation of the rear derailed was a piece of cake. I was planning on modifying my 10 speed to a single speed just until I could save up to get it fixed at a local bike shop. After riding around with my bike as a single speed for a few months I'm hooked. I don't know why, but it's so much more fun with only one gear and I've found hills are actually a lot easier to ride up. I purchased some Velocity Deep V's on ebay and the rear comes with a flip flop hub. I'm not sure what kind of cog (freewheel?) I'll need. I'm planning on getting a 20t cog as my dorm is on a fairly large hill and so is the campus.

From one of the ebay pictures, it looks like the flip/flop hub I got is this one here: https://www.shopatron.com/products/pr...-XX/7455.0.1.1

Here is a link to the rims I got:
https://www.ebay.com/itm/150694078661...#ht_500wt_1413

Is there a certain cog I should get for the fixed side? I'n new to this, I really don't know.
Am I golden with one of these? https://www.bluesteelcyclery.com/prod...og-65497-1.htm

Will I need a lock ring?
From the looks of it, there is a lockring.

What kind of spacers?

Any freewheel will be just fine. Get something cheap. As for cogs, anything that isnted stamped is fine. Lots of people dont like the surley cogs, but they are fine. Ive never had an issue with the few I have had. The ebay listing says the wheels come with a lockring, so youre good on that. No spacers needed, assuming your bike was really a 10 speed.

Sweet thanks for the reply. Let me get something straight, though. The freewheel is for the single speed side and cog is for the fixed gear side, right?

Also, what do you mean by "stamped"?

Freewheel is the one that can coast. They will thread on either side, if you decide fixed is not for you. But since youre going for both, it threads onto the side that has the same threads the entire way across.

The cog is the fixed gear. It threads onto the side that has the lockring on it. Once the lockring comes off you will see there are two seperate threadings. The larger one goes in the normal direction, that is where you thread on the cog. The smaller ones are reverse threaded(righty loosey, lefty tightey) and that is where the lockring goes.

In order to properly install the freewheel all you need is the right sized chainwhip. For the cog and lock ring you will need the right sized chaimwhip and a lock ring spanner.

Fixed cogs are usually 1/8" wide, so they will need a 1/8" chain, and chainwhip. Freewheels are usually 3/32" wide, but you can get 1/8" wide freewheels. That is probably your best idea.

OK, one last question just to double check. On my fixed gear side, any of these would do the job right?

https://www.bluesteelcyclery.com/prod...og-65497-1.htm

Yes

Just double checking

Thank you very much.

I've put a lot of miles on my Surly track cog. Never had any issues with it. Have fun with your conversion, and welcome to BFSSFG

There are cheaper options as well.

https://www.retro-gression.com/product/track-cog

"Stamped" is just like it sounds -- the cog is stamped out of sheet metal. Better cogs are forged and machined. The cog on the right below is stamped; the other is forged. If you look at the center section on the stamped cog, you can see how the sheet metal curves down to form the flange for the threads. On the other cog this is a sharp, machined transition. It's difficult to see in the picture, but the forged cog also has tool marks from the machining process.

Another problem with cheap stamped cogs is that they are often too narrow on the threaded portion, such that a spacer is required to permit the lockring to press against the cog, instead of bottoming out on the hub.

Ooh, I got really excited for a second but I decided to go with a 19t sprocket so I'd have more skid patches and Retrogression has no 19ts.