Good Tire size comparison calculator

[YY1]

This one lets you see 2 different size tires side by side and shows differences-

https://www.tacomaworld.com/tirecalc?tires=275-50r15-235-60r14

Great for seeing how rake is affected on our cars from the rake era

Also calculates diameter in inches, calculates RPM at a given gear ratio, and shows how speedo will be affected if changing sizes.

 

[metalman]

Discount Tire has a size calculator on their website as well. Really handy when you want to change tire sizes