We put up shots of Luca's bikes from Verona, and wondered if anyone knew about Circle F frames. National number (and the de facto GNC champion - on singles and twins combined) Sammy Halbert got in touch to say...
'I was just reading your blog and noticed you were looking for info on Circle F racing frames. They were based out of Bellingham, WA. I believe they have been out of business since around 2003 or so. former national #10 Dan Stanley used to race them all the time him and Brian Billings of BBRP always used them they were a good single shock frame for Rotaxs.'
UPDATE: Shocking even me with his nerdiness, Ben said he had these shots (below) of a stripped Circle F (we think) in a file, but can't remember where he found them. The bolt on sub-frame is the way to go. If you really stack the bike you can just bolt another on.
Yes demountable rear ends a really good idea, early Manx Norton subframes were bolt on and Rob Norths have been made with the Main frame in T45 and the subframe in softer cold rolled or similar as a sacrificial unit
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