If there had been a suitable 16" rear tyre available for a GP4 car then there wouldn't have been a 17" wheel option but it was the same story that everything available was predominantly a track/race tyre so there was no logic to it.
I understand that the 16/17" combination isn't to everyone's taste but it is an option that opens up a few more tyre combinations for some people.
Just to clarify it is also possible to fit 15" wheels on the LB, it is not restricted to the 16/17" combination.
Regards
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