I did a lap of H10/10 on 66" as a shake down test before last year's MG event. In the olden days, people spent all winter doing club runs on 66" and the MG was the first event of the year, so it was a transitional thing on the way up to the huge 84" (or even 88" if you really wanted to get the old timers sucking their teeth) gear used for the serious racing in the summer.
I did a lap of H10/10 on 66" as a shake down test before last year's MG event. In the olden days, people spent all winter doing club runs on 66" and the MG was the first event of the year, so it was a transitional thing on the way up to the huge 84" (or even 88" if you really wanted to get the old timers sucking their teeth) gear used for the serious racing in the summer.