Fittr app for iPhone and iPad

Sick of the guessing game when it comes to buying a new set of wheels? Want to achieve that perfect fitment on your show car with minimal effort? Fittr has you covered! Simply type in the specifications of your current wheels and tyres, plus the specs of the ones you’re looking to fit and Fittr will show you a visual comparison of the two.

You’ll also get access to technical data for each set of wheels you compare:

Diameter - The overall height of the wheel, including the tyre.

Circumference - The outer perimeter of the wheel including the tyre.

Poke - How much your wheel will stick out from it’s mounting point (usually the hub). Fittr also calculates how much more/less poke your new wheels will have compared to your current set.

Inset - How much your wheel is set back into the arch (important so you can calculate if new wheels might fowl the strut or inner arch-liner). Fittr also calculates how much more/less inset your new wheels will have compared to your current set.

Speedo Error - Wheels with a different rolling circumference will affect how accurate your speedometer is, which is calibrated to factory wheel and tyre specs for your vehicle. Fittr lets you know how installing larger or smaller wheels will alter this, and by how much, showing you comparative readings for 30 and 70mph.

Ride Height Gain - How the overall height of your car may be affected by fitting wheels with a larger/smaller overall diameter.

Arch Gap Loss - the gap between your tyre and your arch. What you gain/lose in ride height, applies here too.


We’d love to hear your feedback, so please feel free to leave a rating and comment here on the App Store so we can continue to improve Fittr!