Tires impossible to get for 18" x 4" MC18 R2J wheel. Yes I know a 150/60-18 will fit but prefer the 4 1/2" rim. Does anybody have one they are willing to part with?

Tried the rear suspension linkage modification and a 17" MC21 wheel but it interferes with dogfight pipes which then interfere with fairing.

Located in the states.
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MC21R9N track
MC18R2J track
CBR954
CR250