Hi, it's a 19" frame. The wheels are the original so the front is a quick release exage hub I think and the rear is a screw on type of whatever raleigh will have put on it. I'll have a look in the morning to get you the exact details. I can also tell you I've put a new chromoly axle in the back wheel.
I've no idea what the oln width would be but I imagine it's not huge as the rear stays aren't that wide apart and you'll only get a 1.95-2.0 width tyre between the chain stays at the very most. It is a seven speed cassette however if that helps.