Das Ninjabot Posted December 5, 2017 Share Posted December 5, 2017 So here in Minnesota the weather finally turned and we got a bit of ice and snow. That motivates me to put on a set of snow tires that I picked up off of Craigslist. They are in great shape but I have some concerns about the tread depth. One tire is 8/32nds, two are 7/32nds, and one is 5/32nds. I've read that you don't want more than 2/32nds difference between all four tires on our cars. Is there a way I can remedy this? I've heard that I could get the deepest tread tire shaved to bring it in line. Is this my best solution or am I overthinking this? Should I mount them as is? Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted December 5, 2017 Moderators Share Posted December 5, 2017 What's the date code on the tires (4 digit code that indicates month/year that they were manufactured)? At 5/32nds, a lot of snow tires or pretty much done in terms of wear and could stand to be replaced. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
Das Ninjabot Posted December 5, 2017 Author Share Posted December 5, 2017 That's a good question. I'm not sure/not at home right now. Seller said he had two years on them. I don't have any reason to doubt him, nor do I have any reason to believe him. I can look tonight after I get home. Link to comment Share on other sites More sharing options...
Osei Posted December 5, 2017 Share Posted December 5, 2017 Subaru says the max difference is 5/32" in circumference O. Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted December 5, 2017 Moderators Share Posted December 5, 2017 Subaru says the max difference is 5/32" in circumference O. I've heard in the past that the max allowable difference is 1/4-inch of tire circumference or about 2/32-inch of tread depth. I haven't heard the 5/32" circumference difference. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
Osei Posted December 5, 2017 Share Posted December 5, 2017 Been awhile since I checked. Am positive that the 5/32 was the spec. A quick search shows that 1/4" is what is now being spoken of. Tis better to err on the side of caution. O. Link to comment Share on other sites More sharing options...
Das Ninjabot Posted December 5, 2017 Author Share Posted December 5, 2017 Subaru says the max difference is 5/32" in circumference O. That would help to explain some of the inconsistent and contradicting things I've read then. Is there a better way to calculate this than just grabbing some string? Link to comment Share on other sites More sharing options...
Osei Posted December 5, 2017 Share Posted December 5, 2017 Nope. Flexible tape or string. With a string its easy. Take one tire and wrap the string around the center of tire. Pull taut and using a pen go across where they intersect. Then take the string and wrap around the next tire. Measure the distance from the mark to the new intersection. Repeat for other two. Keep the string close to the center in each case. O. Link to comment Share on other sites More sharing options...
GTEASER Posted December 6, 2017 Share Posted December 6, 2017 Circumference is C=2 pi R or pi D So if the tread depth difference is 2/32", you're well over the 5/32" or 1/4" circumference difference, whatever it is. 2 x 3.14 x 2/32"(.0625) = 0.39" or almost 13/32" GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
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