A standard CB750 rear wheel is 4.00-18 where 4" is the width and the high is 90% of that. The standard rear tyre on a CR750 was 3.50-18.
I have found a rear tyre, Dunlop KR145 with dimension 3.75/5.00-18
Can someone try to explain what this size actually means? compared to 4.00-18.....
