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If you're not too worried about a high degree of precision, a tenner can buy you some hanging scales (from the meat industry): http://www.amazon.co.uk/Silverline-251073-Hanging-Scales-Heavy/dp/B002QRWIT6
But then... if you're not worried about precision your spreadsheet is good enough.
Put the wheel on its side with the axle in a bowl. Weigh it. Weigh bowl. Subtract.