I have a Supermodel. 96-97ish maybe 98. 1-1/8th headtube, American BB. It is a Kastan built model. The top tube on it is measuring center to center at 20.25. All the discussions of these frames put the top tube at the shortest 21. There is a stamp on the BB shell which reads RXP. Is the XP meaning Expert? A 20.25 top tube would put it at Expert size. I think these frames only come Pro size. Thanks.

I thought there was a Formula (expert) frame during that time also.

Formula is right. It was the model one size down from the Supermodel. The Puppy was below that in size.

How rad is that? Ask a Supermodel question, and Craig Reynolds answers you.

Craig: were the specs on your Mongoose "Dr. Smooth" model the same as the Supermodel?

Also, when are you going to come back and destroy Vet Pro. Not to blow smoke up your but*, but someone's got to stop Carnes...