There are a few things to consider when trying to determine the size of your steering wheel. The first is the make and model of your car- some cars have smaller or larger steering wheels than others. You can also look at the circumference of the steering wheel- most are between 14 and 15 inches. If you're still not sure, you can measure the diameter of the steering wheel from one side to the other. Finally, keep in mind that there are aftermarket options available if you want to change the size of your steering wheel.