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@gbj_tester
@oz: 7075 is strongest. I bought from here, back in 2007 a 250mm square of 6mm plate was £24. Most of the online metal shops don't carry 7075, as it's expensive and few hobby projects need the extra strength. 6082T6 is <£6 for the same size from http://www.aluminiumwarehouse.co.uk/cutting_calc.php?gclid=CLbyoaq6vq0CFS9ItAodtTCf_A
@fussballclub: cassette per wheel, no need to change chain if you don't run your chains down to the last atom of their life