Hi John, I've just dug the invoices out from Terry for the chassis he built me. Dated August 1975, 10" wheels on the front & sidecar with a 12" wheel on the rear. The invoices break down the prices of all the items, even tyres & innertubes, ever the bussiness man Terry . I'd post them on here but I'm not sure how to do it now a days, may be steve could help me???