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Ultamax cranks were hollow too I believe; something to do with Robinson if my old brain remembers correctly?
Thanks mate, I did mean Ultramax. I thought the same as you that they were the first of the hollow cranks, came out in 81 or so, dunno how strong they were tho'?
I have a few of these type of cranks SR TURBO-X and TIOGA Tubular MAX-flo (pictured )