Tire size is 205/50R15 and was thinking about getting some 15x6.5 Rota Slipstreams. I really like the look of these wheels but I don't think any of them come in the 15x6.5 I'm looking for so is there anything similar out there?

Rota Boost 2R BOOST 2R - ROTA Wheels,
Advan TCIII Range Yokohama Tyres | ADVAN Racing TCIII
Advan Racing RGIII Yokohama Tyres | ADVAN Racing RGIII

 

Why are you looking for 15x6.5" exactly? You can fit up to a 15x8" wheel under the car without modifying the sheetmetal, as long as you get the right offset.

 

"It depends on the tire.

Most 205/50-15 tires are approved for mounting on rims 5.5-7.5 inches wide. Most of them look pretty neutral on 15x6 or 15x6.5, but start to look stretched on 15x7. The one exception is the Falken Azenis RT-615, which is notorious for being larger than other tires labeled with the same size; the RT-615 fits nicely on 15x7."


From what I've read the 205/50R15 fits perfect on the 15x6.5 and 15x17 which looks fine to me too but slightly stretched according to others. https://tyrestretch.com/7.0-205-50-R...Toyo-R888.0-2/

 

Both of those tire choices in the link, are R-Compound tires. They tend to be bulkier, and on those pictures provided its kind of obvious that they bulge more. "Stretched" would be the other direction, where the treadwidth is narrower than the wheel.

Here's a 205/50/15 RT-615 on a 15x7:



And, here's a 205/50/15 Dunlop Direzza DZ101 on a 15x7:



I would say that there's a small difference in the two, yielding towards the 615's for a wider footprint.

 

Thanks (= After more research I'm leaning more towards 195/50/15 instead or 195/45/16 but I'm afraid the ride quality won't be as good as the 195/50/15.

 

Well, running a similar overall diameter tire on a larger diameter wheel will typically yield a decreased ride comfort.