Does anyone know of a calculator or website that helps determining tire/ wheel size changes?
I currently have 19" wheels and I really would prefer something smaller (16" rims). The reason being that I want more rubber and dampening when off pavement. I’m trying to figure out how to keep the overall diameter the same, so that it does not change the speedo/ odo.
Any thoughts would be appreciated. Thanks.
If it matters, the car is a 2021 CX5 AWD.
The Tirerack website should show you what size wheels and tires are compatible with your vehicle. Bear in mind that smaller wheels might not be feasible, given the size of the brake rotors:
Yeah, I forgot about the brakes.
Thanks
The tirerack web site indicates 16" wheels were available on the CX5, I don’t know if there were different brakes for them. Not many tires that fit, though (14). Lots more with 17" rims (91)
Yes, it looks like the 17s will probably do.
Thanks
You want tires with more sidewall for off-road excursions? Not a step further and all-terrain tires? Are you going to keep your current wheels/tires for future use?
If you have an AWD vehicle…be very careful about changing the wheel/tire size.
AWD systems are very sensitive to the tire diameters. You might “solve” one problem just to create another very expensive one.
I might assume the OP would try to stay close to original OD tire size when changing rim dia. That should be an end result of endeavor.
Same overall diameter, just more rubber less rim.
45/20 is similar to 50/19 and then 55/18. Friend has qx50 suv with 20” tires. My suv never had 20” tires. I had a set of 18” wheels for awhile. Am using 65/16 tires now. Odd gm size.
I applaud all of these owners and drivers who are consciously efforting to buck this ridiculous trend toward 767-sized wheels wrapped in wide rubber bands of tires.
Narrower wheel & tire combos on a smaller diameter rim with more sidewall will in fact yield a more comfortable ride, and not to mention, better self-aligning torque - in English that means the vehicle will be less prone to side-to-side tugging influences(tramlining) and will track straighter with less corrective input by the driver at the wheel.
Here is a link for tire size calculation, sorry if someone else posted already:
https://tiresize.com/calculator/
Here is a typical scenario I ran, just to give all of you a flavor for how the site works - it’s a minus-size from 19inch rims down to 17s:
NOTICE the green cross-hairs: The tire size recommended at that intersection is the ideal alternate size for this demonstration conversion. You can go up or down a size from it, but that will be the best size conversion to preserve height, speedometer accuracy, TPMS, transmission function, and other items affected by up- or down-sizing wheels and tires.
It is best to consult your dealer first for any tire/wheel up- or down- sizing, or alternatively, a reputable tire center(Town Fair, Mavis, Firestone, et al).
OK, not an expert tire engineer, but did a 17 year stint with dealing with tires everyday in real world applications… But never been a big wheel guy, so you got me on the 767 sized thing???
I understand the rubber band thing and hate them, but made a lot of money off BMW and MB with there junk wheels cracking when hitting a pothole with the 35/40 series tires… lol
What do you mean buy 767 sized… I’m probably going to go duhh once you tell me though… 
Boeing 767, maybe?
Possible, but I have disposed of those tires and they are anything but low profile… lol
I’ll let you ponder it for a while 
I was referring primarily to the rims/wheels on late model cars. Ridiculously oversized for sedans and even small SUVs. 767-sized just a metaphor - or my attempt at one.
Read my comment directly above the guy inspecting the main gears you posted. You might get which part I referred to as ‘767-sized’.
Did everyone just roll out of bed or not have their coffee yet??
767 millimeters equals 30.2 inches.
Am I the only serious participant here? Come on…
