What you are doing is called +2 as in adding 2" to your wheels diameter. To keep things as accurate as possible you will want to keep your overall diameter close to stock. This means you will have "more wheel" and "less sidewall", make sense?
There are advantages and disadvantages to both. The 17" should feel more responsive and look better, but (typically) the car will ride rougher and the tires will protect the wheels less effectively which might be something to consider if you have huge potholes where you live. 17" tires usually cost more & in most cases the tire/wheel combo is lighter when using smaller wheels.
Doing this is VERY common and should not cause you any issues especially when you are going with a combination that is offered on a similar model. I'm sure there will be lots of people that will go to even 18s & 19s on this body style Corolla.
I guess the owners/admin are worried about spam so I had to drop out my links to a handy tire/wheel calculator and a great place to find the overall size of almost all the current tires made. (I have no affiliation to either sites, just trying to be helpful.
I tried to get around the rules, but I was accused of suing a sneaky URL......the Corolla stuff is serious, we better keep Snowden at bay here. LOL
xxxxxxxxxx you can play around with this tire/wheel calculator to see what you might be interested in. (don't let the offset stuff confuse you, since you are using stock Corolla wheels in both cases it is not an issue)
Visit xxxxxxx and click on any tire, and then select the tab "specs" to see the overall diameter of individual models of tires.
You can give other things some thought as well.
For instance, I have a car in the garage that has 225/45/17 on the front. I only dive this car about 500 miles a year. The tires on this car have almost no wear on them. but are getting a little old. Before I traded my 13 Corolla for a 15 I was in need for tires. I was going to use the 225/45/17 on the 13 Corolla without hesitation. The 225 would be 10mm wider and 1/3 of an inch taller. This would effectively slow down my speedo a little, but more than likely it is a little optimistic anyhow.
Keep your 15 "steelies" to run as a dedicated set of winter wheels/tires if you live in such a climate. Skinnier tires work best in the snow.
Have fun.
