Blessed are the ignorant for they shall build sidecars. I did'nt know or think that the FIM still allowed passengers. The last passenger I saw was Tommy Ivo stretched out on Maurice Brierly's outfit at, I believe, Elvington in England in the early 60s. As to the tire. I think logic actually prevailed for once. A tire designed for 100+ mph, for hard cornering, braking etc. should be more than ample for a, hopefully, 100+ mph sidecar at El Mirage. In the 80s I had a kart with a 650 Yamaha in it. We played with it at El Mirage. Sliding it sprint car style and just plain wringing its neck down the lakebed. We never had tire problems. Should I find a 5" Goodyear I will certainly use it. My own feelings on the tire issue is that a lot has been made out of nothing. If you wander over and have a look at most of the car tires they tend to ancient cracked all over LSR tires. If most of the cars I've looked at at El Mirage were to show up at the motorcycle tech there would be cardiac arrests all round. Or to put it another way, ask any car guy how old his tires are and see how loud he laughs.