I saw a nail head in centre of tread of a rear tyre when inspecting. Pulled it out - hissing noise. Talked to 3 local places that fix punctures, none will do a repair due to the acoustic foam. Mine are Michelin Pilot Sport 4 235 45 ZR18 98Y TO, I've been offered a Michelin Pilot Sport 4 235 45 18 98Y Extra Load for £168 (inc VAT, fitting and balance) - no acoustic foam I understand, available in 2 days.
Questions
1) What does the TO on the tyre mean?
2) Have others found places recently that will repair acoustic tyres?
3) Has anybody replaced any tyres with none acoustic tyre and noticed any difference in noise?
I'm tempted to order 2 none acoustic tyres, one for now and one in reserve.