So I can fit a rack and fenders on it without the bolt hitting the small cog?
I have an old Miyata one-ten that's somewhat updated - Mavic rims, Dura-Ace/Ultegra/105 drivetrain (kept the friction shifters, though), moustache bars.
I discovered yesterday that the rear fender eyelets are not threaded. You need a nut and a bolt to go through the whole mess. There's almost zero clearance between the chain and where the bolt would go through. If it were threaded, no problem. I'd just use a very short bolt.
I can either space the frame out and put washers on the hub. That might give me clearance. Or I could maybe have the eyelets tapped for threads, but then I'd need a fat, stubby bolt.
I could also just pretend I'm a roadie and never need to carry anything on my bike or ride it in the rain.
The conversion would cost me zero. I have the parts laying around in my garage. Also, the bike lacks shifter bosses and has nice long dropouts. I think it wants to be a fixed gear.