hey so this is my first fixie I will build, and I was just wondering if I could get some advice. I'm thinking i should get a kit, like the IRO V1 build kit, because it seems an easy way to get started. I already have a frame and fork, 1987 Trek 560. but I'll also need wheels... the IRO standard ones seem good to start with as well. What do i need to know about the rear hub and the different spacings? what do you guys think??? is this a good way to start? thanks

Check out Sheldon Brown's article on conversions. He covers most questions you'd have. https://sheldonbrown.com/fixed-conversion.html

I'm guessing the spacing on the IRO rear wheel is 120 and the spacing on your frame is probably more than that.

I believe that IRO wheels use formula hubs. They will work with standard road spacing. You probably do not need a whole build kit, if your bike is complete. Strip everything off, you will need a new BB with a shorter spindle, a chainring,, chain, at least a rear wheel, and cog.

your pedals, cranks, headset, seatpost, saddle, brakes tires, tubes, handlebars and stem are all reusesable

The IRO build kits would be a good starter kit and the wheel sets come in various spacings. You should need a 130mm but don't take my word for it, get out the ruler