Oversized Tires vs the Speedo & TPMS sensors on 5 wheels?
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- Опубліковано 11 вер 2024
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Oversized Tires vs the Speedo & TPMS sensors on 5 wheels?
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I have a full size spare I rotate in as well on my 2013 Outback. I made the investment in the ATEQ Quickset tool though and I think it is well worth it. Very simple to use and reprogram the ECU as long as you make sure to keep track of the TPMS code for each wheel. Otherwise you need a reader also to pull the code. (Ask me how I know). So I just went ahead and bought one too! Cheers
I went a bit of a different route for TPMS on mine. I have 4 AT Tires and a full sized matching spare. 245/65/17 Falken AT3. 4 OEM TPMS. No TPMS in the spare.
Based on the factory sized tire versus the factory sized spare at no point during the tread life of the AT tires should tread depth difference exceed 3%. In fact it's more like half that.
(13/32" brand new on that tire - 2/32" legally end of life = 11/32". 11/32" On a Tire with a Diameter of 29.5" is a difference of around a 1.4% circumference difference.)
I say 3% because that happens to be the size difference between the Subaru factory sized tires (225/65/17) and the factory sized spare (155/80/17) so I am comfortable running it since the newer AWD systems don't require the FWD fuse to be installed and seem to be able to compensate for differences in circumference of at least 3% based on OEM specifications.
I also have a second set of 4 dedicated winter wheels/tires with Schrader Red TPMS Valves cloned to mimic the OEM TPMS. This allows me to change the wheels without needing a trip to the dealer, garage, or buying an ATEQ QuickSet TPMS or similar too. I keep the factory lame donut around to use with these.
Thanks for the upload! Good info here.
I dig it. Thanks for the info!
Bruceyyyyy, that's some good info! The general consensus on subaruforester.org was that the difference in circumference of the tires should not be greater than 4-6mm (comparing the most worn, to the least worn). I believe the math comes out to 3 to 4 / 32nds. I was thinking of shaving my spare down from 11/32 down to 8/32 but you are saying this does not need to be done? I'm just trying to confirm.
I know the problem with the formula for what is acceptable is that Subaru's max tire diameter has been getting bigger and bigger with each new model. I'm running a 29" tire with no problems, but the stock 2014-2018 Forester XT's come with a 27.7" tire.
@@JonDZ_Adventuring I am basing my math on the factory Subaru tires and the factory spare tire size and getting a 3 percent difference between the two.
From there I'm assuming that Subaru knows what their own cars can handle.
You can check my math if you want.
This is based on the 2017 Outback.
I hang out on the Subaru Outback forum if I miss your message here.
@@bruceyyyyy first, I'm a fan of your work! I appreciate all the research you've done, especially the video you made pulling the VDC fuses out!
I never heard of a 3 percent difference rule and If you can reference where Subaru said this, I'd really appreciate this.
below is an article back from 2012. I think there might be a newer article saying that because Subaru tires have been getting taller, they can handle a tread difference of 3/32".
www.dunntire.com/blog/Tire-Replacement-on-4WD-and-AWD-Vehicles
@@JonDZ_Adventuring I don't have anything from Subaru saying 3% variation is within acceptable limits.
I am extrapolating that data from the OEM spare compared in size to the OEM tire size and finding a 3 percent difference in circumference between the two. Check the math in the first post here.
This difference in size coupled with the lack of needing a FWD fuse in newer models tells me that it is within the acceptable limits. At least with short distance drives.
I am open to any data you have saying otherwise as I obviously don't want to mess anything on my own car up.
Thanks for the kind words! I will always be tinkering. I am currently working on swapping a VDC system into a car that was never equipped with it. Should be fun.
I do the same thing that Bruceyyyyy does and just rotate the 4 tires. I'm not totally sure if there wouldn't be any problems with running a tire that's 4/32" with a 11/32", but my plan is to shave my spare to 8/32" so that it's surely compatible with an tires life. I believe the TPMS sensor is there to save people from possible catastrophe, to help prevent tire blowouts. The moment I see the low pressure warning, I inspect my tires and watch the one with low pressure very carefully. I've patched my tires 4 times (using plugs and vulcanizing agent), and got a set of Yokohama G015's to last 40k miles. The tread was toast, so i just replaced them with a set of (5) Hankook Dynapros. It would scare the crap out of me to not know if a tire was melted from the inside out and on the verge of blowing out. Stay safe man!
Excellent update. Thanks for the research and information.
Thanks for watching, Randy.
You talked a lot about rotating, and I know Subaru's are more finicky than many AWD cars about equal Tire diameters so my question is how often are you rotating? Do you still wait for 7k to 8K or do you go more often to keep a closer variance with the spare?
Also just a free observation and worth it's cost. If you only have 3 TPM sensors on the ground you still need to watch the tire without but you could get an earlier warning if you pic up a nail in one of the 3. If you have to watch all the tires or one of them it's no more work but can be more info for you.
Thanks, I enjoy the vids
I rotate every oil change which is roughly 5000 miles since I'm using a full synthetic. It's probably overkill with this tire, but it doesn't hurt that's for sure. You could probably get away doing every 10k if you wanted to push it. I don't believe Subaru is any more finicky than any other full-time AWD vehicle, but they may have a more frequent recommended rotation schedule or a smaller variance in tire diameter/tread depth compared to other mfgs just because they chose to. Thanks for watching and commenting!
i think the better scanners can change tire sizes in the ECU.
I’m entirely new to upgrading tires so my questions is probably pretty basic for you, but here goes:
I just picked up a ‘19 Forester Sport that comes with stock 18” wheels. I would prefer not to change my wheels and purchase new tires to keep costs low. Do you have any recommendations for off-road tires that would fit these wheels? The stock tire size is P225/55R/18.
I try to do a lot of mild to moderate off-roading.
Can't go wrong with the BF Goodrich TA Ko2. Best tire I've ever owned.
Michael Gray would they fit on the stock 18” wheels?
Michael Gray ok just looked them up and found my correct tire size. Is there anything I would need to watch out for as for as fit? Wouldn’t want the taller walls to rub
You'd have to do some research if the tires are larger in any way from stock. If they are the same exact size then you should be fine.
Michael Gray appreciate the help and tire suggestion!
i have the same tires on my outback with method wheels,same size as yours. 2mph off.
2 mph off.. at what speed?
@@HighjakSecondary mainly checked above 30. but when doing 62 speedo shows 60.
mine is a 08 outback.
@@johnmastr7901 Gotcha. Yeah, give that calculator site a look I mention in the video. Input your factory tire size and input your current size and it will tell you exactly what percentage you're off and what MPH when your speedo shows 60MPH etc.
What tire did you like better the open country or the KA02?
Hey. What lift is used?
When running bigger wheels on most vehicles they talk about changing the gear ratio (I assume for improved torque). Is this an issue with the CVT? I assume your 5% difference isn't enough to notice but what if you went bigger?
Changing gears on these vehicles is very uncommon or not doable in a lot of cases. Regardless, I don't believe these cars can accept such a larger than stock tire that it's a big enough concern to mess with anyway. With my CVT and the tires you see here it's just fine. Some guys are running the 30x9.5r15 tires on the naturally aspirated Subies without issues and some are doing so on the turbo models. I think I'd prefer the turbo model simply for a bit more HP and torque if going bigger than the size I have now, but as far as changing gear ratios it's not something seen with the Subarus very often.
Anything you would do differently? Diffrent lift kit, or parts you bought?
I have a few more mods to make and after that I think I'll do a video on this.
Wont that put false mileage on your car though?
I'm not sure I'd call it "false mileage" - it's not like anyone is putting their car on cinder blocks and running it in reverse Ferris Bueller style. Running larger wheels/tires is a very common occurrence and a large majority of drivers are not modifying the car to correct for the change. I would simply recommend keeping track of the change and at what mileage the tires were installed thus when the vehicle is sold the proper mileage can be documented on the title for the sale. As mentioned in the video the larger tires will change the odometer reading.
@@HighjakSecondary I didn't mean good false mileage Haha I meant negative. For every 70 miles you drive it adds an extra 3 miles for every 7,000 miles driven it adds 300 and every 70,000 miles it adds 3,000. I know it's not much at 140,000 real miles it'll read 146,000 is what I was trying to say! I went to go bigger tires too but I'm a little OCD with that.