New tyres on a 750F 1981??

[The Swede]

I need a new set of tyres for my bike.
Is there any1 who can tell me what the maximum whidt and height is for the rear tyre..i have right now 4.00x18",but woud like something bigger,if the rim can handle it.
The size 4.00x18 looks to be a bit difficult to get here in sweden,and the correct translation to modern size (120/80x18, or 110/90x18,depending on where i look it up), and to get hold of a reartyre in that size seems to be allmost impossible around here.
So can i put on say a 130/70-tyre on the rim? or is the rim to thin for it?

 

[Maurits]

Hello Swede,

I am also looking at getting the largest tire size possible on the standard rim for my CB750 FD. I will let you know when I find out or unless a reply comes up here first.

Cheers,