I picked up a 85 Centurion Ironman for commuting, but it's set up more as a road bike. I'd like to make some changes to it, but I'm having a hard time figuring out just how much leeway I have.

Okay, firstly I want to add fenders. I don't have any braze-ons or extra lugs that would allow it, so it seems I'm limited there.

Secondly I'd like to add a rack, at least to the rear. Again, lack of braze-ons or lugs limit my options.

Finally I want to replace the CTS 23mm tires on my with something more suitable for commuting. I'd like to go with the Schwalbe Marathons in a 25 or 27, but I'm not sure what my limiting factors are. I've got Shimano 600 brakes and Araya 700c wheels.

So, oh great BF Brain Trust™, what say you?