Should I buy new wheels as well?

[Compeer]

Originally Posted by Neinris

Personally I use this calculator instead:
https://www.wheel-size.com/calc/

Not only does it show the tire size, it also shows necessary offset.
What I didn't see mentioned are the supposed stock wheel/tire sizes of 175/65/R14 = 23 and 185/60R15 = 23.7

I discovered that there are two different speed sensor gears, mine has the one for 175/65/14, so my 185/60R15 tires makes my car go faster than what's indicated on the gauge cluster.
Use the calculator provided to get to the closest stock tire size. If you want to get better gas mileage, get a bigger diameter wheel/tire combo. For acceleration, smaller diameter.

If i remember correctly the car had its ECU changed to suit the wheels at factory. With the right scan tool i was lead to believe you can change the speedo to suit the new wheel size. Could be wrong with the yaris tho but i know other cars you can do this.