Can anyone tell me anything about the bridgestone Mile 112 frame and how they compare to a bike like the RB-2, or any of the numbered (400, 500, 550, 600, etc) frames?

I have an early Mile 112 and its a really nice bike. There were two versions, the early one was lavender and silver and had a 4130 chr/mo frame and fork. The later version was aqua and white with an aluminum fork.
The fork bears a long rake intended to make for a comfortable ride at the end of an ironman (112 mile bike) triathalon.

Definately nice bike IMO and you don't see many around. Nicer than the earlier hundred series, comparable in quality to RB-2 but very different geometry. Mine is currently (blasphemy) my fixed gear trainer and a pleasure to ride:

If i pick up the one I'm looking at, it will also serve as a fixed gear for now. Is there much clearance for fenders? I'd like to run 25-28mm tires with fenders. Is the geometry pretty lax? The tire clearances look tight. Do you happen to know the seat and head tube angles?

The geometry is fairly relaxed. I am running 700x28 Ruffy Tuffy's with good clearance but no room for fenders.

Sorry, I don't have the geometry numbes but somebody must have old Bridgestone catalogs.

Which model are you looking at, the Lavender/Silver -or- Aqua/white with aluminum fork?

I was looking at the lavender/silver. Its my size and pretty cheap. Just not sure if I need another bike so similar to what I already have.

I really like mine, just like the one pictured but smaller and with special edition written on it. I haven't been able to find much information about it. Seems like a sturdy, well made frame for all around riding, stable, handles great, good looking clean head tube lugs.