5050 axle size?

i'm about to order some cheap 5050xx's but it doesn't say anywhere what size axle they have.
are they 9/16" or 1/2"? I've got bikes that use both sizes, so i don't think I'm just being thick...
are they 9/16" or 1/2"? I've got bikes that use both sizes, so i don't think I'm just being thick...
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Parktools :?:SheldonBrown
phew!
and i know you reccomended not getting 5050's, but Winstanley are selling last year's xx's for £35 with free postage
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