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Tire and rim weights are well known to vary by at least 10% and not be considered "wrong". Molds and dies wear and material density varies. But 570 VS 395 is a lot of difference. I suspect that the problem lies with the spec list being wrong. This also happens all the time. The people responsible for the document writing don't get/ask for the right data from the manufacturer side (which is also often a bit different then what the design side intended too. ) Andy.
Last edited by Andrew R Stewart; 09-07-15 at 10:47 AM.
Reason: weight correction