# Wheel/ tire size adjustment **URL:** \ **Category:** General Discussion\ **Created:** [June 16, 2023, 7:48pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163 "2023-06-16T19:48:49Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![bluedory\_185650](https://avatars.discourse-cdn.com/v4/letter/b/f05b48/32.png) [@bluedory\_185650](https://community.cartalk.com/u/bluedory_185650)\ **Post date:** [June 16, 2023, 7:48pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/1 "2023-06-16T19:48:49Z")
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. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [June 16, 2023, 7:56pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/2 "2023-06-16T19:56:41Z")
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: [https://www.tirerack.com/content/tirerack/desktop/en/homepage.html?gclid=CjwKCAjwkLCkBhA9EiwAka9QRiPoQ99scaAQ1m73bC2i2DlvQVmbF9XvJYOm6P5TUj5ZLrmyKaCbyBoCxpEQAvD\_BwE&ef\_id=CjwKCAjwkLCkBhA9EiwAka9QRiPoQ99scaAQ1m73bC2i2DlvQVmbF9XvJYOm6P5TUj5ZLrmyKaCbyBoCxpEQAvD\_BwE:G:s&s\_kwcid=AL!3756!3!347550706734!e!!g!!tire%20rack&gclsrc=aw.ds](https://www.tirerack.com/content/tirerack/desktop/en/homepage.html?gclid=CjwKCAjwkLCkBhA9EiwAka9QRiPoQ99scaAQ1m73bC2i2DlvQVmbF9XvJYOm6P5TUj5ZLrmyKaCbyBoCxpEQAvD_BwE&ef_id=CjwKCAjwkLCkBhA9EiwAka9QRiPoQ99scaAQ1m73bC2i2DlvQVmbF9XvJYOm6P5TUj5ZLrmyKaCbyBoCxpEQAvD_BwE:G:s&s_kwcid=AL!3756!3!347550706734!e!!g!!tire%20rack&gclsrc=aw.ds) ---
**Author:** ![bluedory\_185650](https://avatars.discourse-cdn.com/v4/letter/b/f05b48/32.png) [@bluedory\_185650](https://community.cartalk.com/u/bluedory_185650)\ **Post date:** [June 16, 2023, 8:01pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/3 "2023-06-16T20:01:53Z")
Yeah, I forgot about the brakes. Thanks ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [June 16, 2023, 8:18pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/4 "2023-06-16T20:18:20Z")
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) ---
**Author:** ![bluedory\_185650](https://avatars.discourse-cdn.com/v4/letter/b/f05b48/32.png) [@bluedory\_185650](https://community.cartalk.com/u/bluedory_185650)\ **Post date:** [June 16, 2023, 8:23pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/5 "2023-06-16T20:23:57Z")
Yes, it looks like the 17s will probably do. Thanks ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [June 17, 2023, 2:28am UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/6 "2023-06-17T02:28:25Z")
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? ---
**Author:** ![ledhed75](https://avatars.discourse-cdn.com/v4/letter/l/f6c823/32.png) [@ledhed75](https://community.cartalk.com/u/ledhed75)\ **Post date:** [June 17, 2023, 10:41am UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/7 "2023-06-17T10:41:05Z")
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. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [June 17, 2023, 12:49pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/8 "2023-06-17T12:49:32Z")
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. ---
**Author:** ![bluedory\_185650](https://avatars.discourse-cdn.com/v4/letter/b/f05b48/32.png) [@bluedory\_185650](https://community.cartalk.com/u/bluedory_185650)\ **Post date:** [June 17, 2023, 1:29pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/9 "2023-06-17T13:29:31Z")
Same overall diameter, just more rubber less rim. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [June 17, 2023, 2:09pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/10 "2023-06-17T14:09:58Z")
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. ---
**Author:** ![ChrisTheTireWhisperer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/christhetirewhisperer/32/34798_2.png) [@ChrisTheTireWhisperer](https://community.cartalk.com/u/ChrisTheTireWhisperer)\ **Post date:** [June 17, 2023, 2:29pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/11 "2023-06-17T14:29:18Z")
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/](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: ![Tire Size - Tire Size Calculator - Example Minus-Size 19 to 17inch wheels](https://global.discourse-cdn.com/cartalk/original/3X/4/2/421fe2c544f33fd406eaed3c0652ecdf42cb2235.jpeg) 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). ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [June 17, 2023, 2:52pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/12 "2023-06-17T14:52:20Z")
> [@ChrisTheTireWhisperer](#): > > 767-sized wheels 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… 🤦‍♂️ 🤣 ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [June 17, 2023, 3:10pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/13 "2023-06-17T15:10:51Z")
Boeing 767, maybe? ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [June 17, 2023, 3:30pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/14 "2023-06-17T15:30:50Z")
Possible, but I have disposed of those tires and they are anything but low profile… lol ---
**Author:** ![ChrisTheTireWhisperer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/christhetirewhisperer/32/34798_2.png) [@ChrisTheTireWhisperer](https://community.cartalk.com/u/ChrisTheTireWhisperer)\ **Post date:** [June 17, 2023, 4:36pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/15 "2023-06-17T16:36:13Z")
I’ll let you ponder it for a while 😉 ---
**Author:** ![ChrisTheTireWhisperer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/christhetirewhisperer/32/34798_2.png) [@ChrisTheTireWhisperer](https://community.cartalk.com/u/ChrisTheTireWhisperer)\ **Post date:** [June 17, 2023, 4:37pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/16 "2023-06-17T16:37:15Z")
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. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [June 17, 2023, 5:17pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/17 "2023-06-17T17:17:38Z")
![image](https://global.discourse-cdn.com/cartalk/original/3X/2/4/2482658fb00fa220450fc3147a9619f34beb2cec.jpeg) Not very low profile. ---
**Author:** ![ChrisTheTireWhisperer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/christhetirewhisperer/32/34798_2.png) [@ChrisTheTireWhisperer](https://community.cartalk.com/u/ChrisTheTireWhisperer)\ **Post date:** [June 17, 2023, 5:21pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/18 "2023-06-17T17:21:54Z")
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?? ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [June 17, 2023, 5:33pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/19 "2023-06-17T17:33:19Z")
767 millimeters equals 30.2 inches. ---
**Author:** ![ChrisTheTireWhisperer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/christhetirewhisperer/32/34798_2.png) [@ChrisTheTireWhisperer](https://community.cartalk.com/u/ChrisTheTireWhisperer)\ **Post date:** [June 17, 2023, 5:44pm UTC](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163/20 "2023-06-17T17:44:03Z")
Am I the only serious participant here? Come on… [Next page](https://community.cartalk.com/t/wheel-tire-size-adjustment/191163.md?page=2)