Originally Posted by
kunsunoke
The tubing is Ishiwata 022, similar in gauge profile to Columbus SL. 022 was most notably used for Bridgestone's MB-1, particularly in later years of the Petersen era.
I was thinking the same thing. I had a crashed RB-1 that had the same stickers. Unfortunately it was worse than this one and the lugs were cracked. It is now hanging from the ceiling at the local coop.