Mr The Whitakers and Mr fiat500
I hope this is a bit more clarity for you, as if you haven't been given enough:-
Here is the reply i recently got from the ETRTO (European Tyre and Rim Technical Organisation.)
Dear Douglas,
It took quite a long time for answering you as your question did not find an direct answer in standards or regulations.
Fitting tubes in tubeless tyres is not forbidden by regulation but should be done only following the indications of the tyre producer, each tyre manufacturer having its own specific recommendation lines.
You should then ask directly the tyre suppliers (Pirelli or Michelin in your case) as they can advise if the particular tubeless tyre you have in mind can be fitted with a tube in line with the fitment and use of the tyre requirements. They may also provide you a statement or a copy from a technical databook explaining the operation (although I doubt this is mention in recent editions) to help to clarify the situation with the insurance company.
Also from an MOT prospective, if a tubeless tyre was fitted with a tube at the time of MOT and this could be identified, this would probably just be recorded on the MOT documentation (providing the wheel/tyre meets all other criteria in the MOT manual, see
https://www.gov.uk/guidance/mot-ins...les-wheels-tyres-and-suspension#section-5-2-3).
I apologise for taking so long to get this clarity from the ETRTO, but it took so long to get it, it just did. I guess the COVID makes everything slower. You have already had the answer really from Pirelli and Michelin, but for some reason there was a motivation to go against what the actual manufacturers said and jeopardise the insurance position. I cannot understand why.
I did also actually contact your insurance company to clarify their position and they haven't got back to me yet with a clear answer.
i have however contacted Hagerty, the insurance company i use for my classic cars. They have no problem with it.
I would also like to make it absolutely clear that Longstone Tyres is in no way sponsored by any insurance company.
do you guys fit 145/70R12 Cinturato CN54?
https://www.longstonetyres.co.uk/pi...-cn54/145-70-r-12-pirelli-cinturato-cn54.html Pirelli have recently made a small batch.