
Ideal Rim Width in inch = (Tire Width in mm/25.4) * 90%
For that particular tire, 195 mm, the ideal rim width would be 7 inch. Anything over that, you'd have a Hipari tire. If you want to save some time (and money, probably) figuring out how a particular tire/rim combination would look, head over here. There you'll see how much stretch you'll get from your combination. It also features a great tire calculator.
Why Hipari? Usually when something's stretch, it'll also be more rigid.. *slap* Stop thinking nasty thoughts! (Btw, more rigid or rigider?) Well anyway, same thing goes to tires. This is the advantage that drifters are usually after. Going sideways would require rigid tires for better post-drift control. By doing Hipari, you'll get a more rigid tire since the sidewalls are stretched. You can also get a more rigid sidewalls on expensive tire so herein lies another advantage of Hipari, narrow tires are cheaper than the wide ones. You can get the same rigidity with less cost.
But admit it, some of us do it for the look. There's nothing wrong with that. Just don't overdo it. There is such thing as too much stretch..

My rule of thumb on Hipari, which can be wrong as i haven't finished building my car, is to add an inch and a half from the intended rim width. So with that 195/45 R15 tire, the max i would go is an 8.5 inch rim. Below is how it would look like:

Here are some pics to inspire you..




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