Oh what fun Mr. Copus is having! What joy he takes in the irony of chopping up a perfectly fine RB-1 frameset (in my size) for my daughter's bike.
It's a 1989 Bridgestone RB-1. With that weirdo Ishiwata EX tubing. In a nutshell, the butted profile is 10/7/8 for the top tube and the down tube.
The good news is that the steel is nice and clean. So by using this tubing, Maddie's frame will be reasonably light. By kid bike standards it will be feather-weight.
Glen chopped out the seat lug cluster, the bottom bracket, and the headtube. We found little gems like this gap in each section. I'll save those details for a future post.
16 hours ago