Are you running an outfit on 16" wheels? Are you having problems finding suitable tyres? I've found an answer. A German company called Heidenau list a 3.50 x 16 ref. K29. Seitenwagen. I ordered online from www.moto-tyres.co.uk Two of these cost me £62.50 inc. P&P and VAT. I can't vouch for their durability yet, I only fitted them yesterday. Len.