Author Topic: Does anyone understand tire and wheel sizes....? Please help!  (Read 253 times)

cdgreg

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Vehicle in question: 2009 Toyota Rav4, Base Model, I4, stock tire size of 215/70R-16.  I currently have our winter tires mounted/balanced on the stock wheels, and a set of all seasons not on wheels for spring/summer/fall. 

Question: Can I mount and balance our all seasons, 215/70R-16, on an extra set of Riel wheels that I have (see photos of wheels)?  I am not sure how to interpret the various letters/numbers on the wheels and if they are appropriate for the 215/70R-16 tires.  The extra set of  Riel wheels currently have some junk tires mounted on them which are 225/70R-16 which tirerack lists as an optional size for my vehicle.  The bolt pattern should not be an issue, they were previously mounted on an '06 Toyota Highlander.

Thank you!  My goal here is to be able to swap the winter <-> 3 Season tires right in my driveway with both sets on rims instead of paying for mounting/balancing twice a year.
« Last Edit: April 20, 2017, 05:13:13 PM by cdgreg »

Geneseo1911

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #1 on: April 20, 2017, 05:21:32 PM »
Won't be a problem. If the wheels are to wide to safely mount the tires (extremely unlikely) the tire shop won't do it. 215s and 225s are only 10mm difference in width....a centimeter.... basically nothing. Make sure you use a torque wrench when mounting said wheels.

cdgreg

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #2 on: April 20, 2017, 05:45:30 PM »
Won't be a problem. If the wheels are to wide to safely mount the tires (extremely unlikely) the tire shop won't do it. 215s and 225s are only 10mm difference in width....a centimeter.... basically nothing. Make sure you use a torque wrench when mounting said wheels.

That is great news, much appreciated.  I remember when I bought generic black steel wheels for the second set for our other vehicle I had to buy a special set of lug nuts because the stock lug nuts would not work with the aftermarket rims.  Should I anticipate needing a special set of lug nuts for these as well or should the stock lugs work because these seem to stick out more than steel wheels?  I attached a front pic if it helps at all.  I am going to have Toyota mount/balance the tires so I am 100% sure they are confident in the safety.  For future seasons, I do have a torque wrench, torque specs, as well as copies of pages from the vehicle owner's manual on how/where to safely jack the vehicle.  Learning a bit every new project! 
« Last Edit: April 20, 2017, 05:52:14 PM by cdgreg »

Christof

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #3 on: April 20, 2017, 06:27:16 PM »
225/70R-16: 225 is the width of the tire in mm. It needs to match the wheel. The width is measured in millimeter. 70 is the percentage for the width of the tire. That means, you tire has a width of 15 cm. Smaller numbers are usually possible, but the car might not be rated for them (speedometer depends on exact tire size, for instance). Larger values might not fit. R is just the type of tire. 16 is the size of the wheel which is measured in inches.

If you compare a 225/70R-16 and 215/70R-16 tire they have a hole of the same size (16 inches), but the 225 is 10 mm wider and about 7 mm larger in diameter (3.5 mm larger in radius).

6Jx16H2: 6 is the width of the inner part of the wheel in inches. That would fit a tire between 185 and 215 mm. 16 is the size of the wheel in inches. That needs to match the hole in your tire. H2 and x are construction identifiers just like the R in the tire. H2 is two humps which basically means there's a hump in a hump in your wheel.

So yes, a set of 215/70R-16 tires fits onto a set of 6Jx16H2 wheels. If the 225 fits your car, a 215 should fit technically, but might not be allowed legally or might require some reconfiguration.

JLee

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #4 on: April 20, 2017, 06:39:09 PM »
Won't be a problem. If the wheels are to wide to safely mount the tires (extremely unlikely) the tire shop won't do it. 215s and 225s are only 10mm difference in width....a centimeter.... basically nothing. Make sure you use a torque wrench when mounting said wheels.

That is great news, much appreciated.  I remember when I bought generic black steel wheels for the second set for our other vehicle I had to buy a special set of lug nuts because the stock lug nuts would not work with the aftermarket rims.  Should I anticipate needing a special set of lug nuts for these as well or should the stock lugs work because these seem to stick out more than steel wheels?  I attached a front pic if it helps at all.  I am going to have Toyota mount/balance the tires so I am 100% sure they are confident in the safety.  For future seasons, I do have a torque wrench, torque specs, as well as copies of pages from the vehicle owner's manual on how/where to safely jack the vehicle.  Learning a bit every new project!

OEM wheels often use a different type of lug nut than aftermarket.  Yours probably look something like this:


Often, aftermarket wheels will use lug nuts with conical seats:


Radius is less common, in my experience. You should be able to tell by looking up the wheel online or by looking at the lug nut mating surface.

cdgreg

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #5 on: April 20, 2017, 07:53:23 PM »
Won't be a problem. If the wheels are to wide to safely mount the tires (extremely unlikely) the tire shop won't do it. 215s and 225s are only 10mm difference in width....a centimeter.... basically nothing. Make sure you use a torque wrench when mounting said wheels.

That is great news, much appreciated.  I remember when I bought generic black steel wheels for the second set for our other vehicle I had to buy a special set of lug nuts because the stock lug nuts would not work with the aftermarket rims.  Should I anticipate needing a special set of lug nuts for these as well or should the stock lugs work because these seem to stick out more than steel wheels?  I attached a front pic if it helps at all.  I am going to have Toyota mount/balance the tires so I am 100% sure they are confident in the safety.  For future seasons, I do have a torque wrench, torque specs, as well as copies of pages from the vehicle owner's manual on how/where to safely jack the vehicle.  Learning a bit every new project!

OEM wheels often use a different type of lug nut than aftermarket.  Yours probably look something like this:


Often, aftermarket wheels will use lug nuts with conical seats:


Radius is less common, in my experience. You should be able to tell by looking up the wheel online or by looking at the lug nut mating surface.

Thank you again for your help and knowledge, I am really enjoying learning and being able to do more work myself as compared to relying on dealerships.  I took 4 close ups of the lug nut holes, would you say they are typical lock nut cone seat or typical lock nut with radius seat? 

JLee

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #6 on: April 20, 2017, 07:56:16 PM »
It's hard for me to tell from the pictures.  Can you tell if the edge of the hole is straight?

cdgreg

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #7 on: April 20, 2017, 08:03:10 PM »
It's hard for me to tell from the pictures.  Can you tell if the edge of the hole is straight?

I was afraid the pictures would not be high quality enough.  From the front, it narrows like a funnel and feels like there is a very slight lip entering the hole.  Once you pass the slight lip it is smooth all the way through. 

At worst I can probably stop by autozone tomorrow and have them tell me. I figure a set from ebay, amazon, autozone, or walmart may be cheaper than the dealership. 
« Last Edit: April 20, 2017, 08:06:36 PM by cdgreg »

JLee

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #8 on: April 20, 2017, 08:10:36 PM »
It's hard for me to tell from the pictures.  Can you tell if the edge of the hole is straight?

I was afraid the pictures would not be high quality enough.  From the front, it narrows like a funnel and feels like there is a very slight lip entering the hole.  Once you pass the slight lip it is smooth all the way through. 

At worst I can probably stop by autozone tomorrow and have them tell me. I figure a set from ebay, amazon, autozone, or walmart may be cheaper than the dealership.

A dealership may not carry the right type, either. If it is smooth all the way through and not cupped in a radius shape, I expect it's conical seat.  You'll need to find lug nuts of the same thread size/pitch - any auto parts store should be able to help you make sure you have the right ones.

sequoia

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Re: Does anyone understand tire and wheel sizes....? Please help!
« Reply #9 on: April 21, 2017, 05:18:08 PM »
I do not see anyone mention the offset for the wheel. I am no expert, so I can not tell you if it will fit, but wheels has what it is called offset. It determine how much it stick out or sunken when you install it. Why would this matter, well, if it sticks out too much, and you hit a large pothole, your wheel my travel high enough and hit the fender and cause damage. Or when you turn to lock, it may hit the fender or inside frame. So just because the tires fit the wheels, and the wheels has the same bolt pattern, does not means it will fit correctly. You also need to make sure your brakes will fit into the wheels.

Tasty Pinecones

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The ET45 is the offset of the wheel seen in one of the pics. Also important and comes in many different sizes.

Beware of the AutoZone guys. Parts guys are not always hired for their experience. That was the case of the auto parts store where I worked. That I knew cars inside and out was merely a hiring bonus for my boss. Take whatever advice they offer and confirm it elsewhere.

nick663

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Along with offset, sometimes you need to watch for brake caliper clearance to the spokes of the wheel or the wheel barrel.  I doubt it will be an issue here as you're not doing anything crazy but it's something to be aware of.  I usually test fit wheels when doing something like this before mounting the tires just to make sure you don't have any surprises.

If you know wheel width/offset, this is a good calculator that will tell you exactly what the new wheels will change in inner and outer wheel clearance:
http://www.1010tires.com/Tools/Wheel-Offset-Calculator
And this is a good calculator to show the speedometer and size difference between two tires:
http://www.discounttiredirect.com/direct/infoTireMath.do