**Tire-Wheel Calculator ***

[Bullitt-]

Many of the older Tire - Wheel Calculators  I've bookmarked have gone away.
This appears to be a good one.

https://www.wheel-size.com/calc/


Also have a Widget

https://services.wheel-size.com/

Older models not covered but many newer model stock wheel specs
https://www.wheel-size.com/size/

[303 Mopar]

For comparing different tire sizes, front to rear or old to new, I like this one....  https://tiresize.com/comparison/