whats the largest width tyre you can fit?

i have a 2006 pointy and will need to get a new tyre soon.

i have a friend who works at triumph and can get them cheap, but only in certain sizes.

i think he said he can get a 190 wide for the rear, but am unsure if it will fit.

whats the largest that will fit? i have a standard rim, and dont want to have the cost of a new rim as it defeats the object of a cheap tyre....

is there any size charts or anything to tell you what size will fit? i know there are some for car sizes etc..

any help would be awsome....

stick to the 160/60- the 190 won't fit

Without making a new thread, will a 180/50 fit? Getting a new one tomorrow and need to know asap! I've read on here somewhere it will. Just wanting to make sure!

No it won't fit, the rear wheel is only 4.5" wide, to run a 180 tyre you need a 5.5" wide rear wheel, as a minimum.

Fitting a tyre that is too wide for the rim will alter the profile and not in any beneficial way.