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didnt they all have a 22mm axle? and was it not the hollow ones that had a slightly beefier outside?
i think the primo race cranks had a fused on spider, similar to old maxy cross or something.
I have seen many sets of powerbites over the years that are non Primo but identical, I had a set of Fitbikeco powerbites.Does Primo actually manufacture powerbites?I never liked them they always creeked and the pedal inserts always came loose. too many bolts imo 7 with the sprocket bolt.