If you go according to this article (see appendix), a tyre with the TLI of 91 would probably be sufficient, although it is registered in Schein 93. In my papers is under 7.1 (maximum axle load) a weight of 1134kg, which would mean load per tire = 567kg and thus I could drive purely mathematically an 89 tyre. Can you understand this correctly or have I overlooked something. I will definitely ask the TÜV. PS. The tyre of course as (XL/ Reinforced) version.