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Then its strange that all 3 speedcodes have the same loadindex.
I found out how that system works.
Rule of tumb is every 10kmph/ 6.3mph different speed, 1 loadindex step different. Higher speed/lower loadindex and reverse.
So if 128/126L, then 127/ 125M and 126/124N.
This rule of tumb already goes wrong in M speedcode and lower.
On trucktires in Europe often aditional service description, officially used term for it.
Then even 2 LI steps different for every 10kmph/6.3mph different.
See picture atached, enlarge it to read the both service descriptions above the yellow line.
And often the loadindex for duall load is left the same.
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