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Old 02-03-2014, 11:20 PM
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Tires Make Me Feel Stupid

I'm not a stupid person, I'm really not, but I cannot wrap my head around how tire and wheel sizes match up. I do not understand why this is so complicated. It's like some kind of arcane magical formula. I even read a couple of articles on it, and I just can't make any sense of anything.

I'm interested in the 35" Dick Cepek Crushers. I want to mount them on a simple, black wheel. The AEV JK Savegre Wheels seem perfect. The problem is that I don't understand how tire sizing works. I don't think. Do these tires fit on these wheels? Please, just someone tell me. I don't want to think about this anymore.


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Old 02-03-2014, 11:28 PM   #2
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What tire size are you going with? Most likely they will fit fine.

Edit, yes they will fit

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Old 02-03-2014, 11:29 PM   #3
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A few clicks on each website covers a lot of information. The last 2 numbers of this tire sizes are the rim diameter they will fit. The tech specs on your AEV wheel say they are 8.5" X 17". So you'd want to look at tires with the 17" rim size and no greater width than 12.50".

35x12.50x17 would be a 35" tall tire, 12.50" wide for a 17" rim.

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Old 02-03-2014, 11:51 PM
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Originally Posted by nwbronco View Post
A few clicks on each website covers a lot of information. The last 2 numbers of this tire sizes are the rim diameter they will fit. The tech specs on your AEV wheel say they are 8.5" X 17". So you'd want to look at tires with the 17" rim size and no greater width than 12.50".

35x12.50x17 would be a 35" tall tire, 12.50" wide for a 17" rim.

Bob K.
Okay, I don't know what magic trick you pulled there (how does 8.5" equal 12.5"? I don't get it!), but I'm happy I have an answer now and know what part numbers to write down to order.

...wait...the tire is wider than the wheel because the tire is an inflated torus and so the wheel is a cylinder that isn't as wide. D'oh. I am stupid. Goddammit.
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Old 02-04-2014, 01:35 AM   #5
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The tire width is measured at the tread not the bead that seats on the wheel. So the wheel will be narrower than the tire.
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Old 02-04-2014, 01:46 AM   #6
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Will those fit on the stock spare tire holder?
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Old 02-04-2014, 01:52 AM   #7
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Originally Posted by Spy Seattlite View Post
Okay, I don't know what magic trick you pulled there (how does 8.5" equal 12.5"? I don't get it!), but I'm happy I have an answer now and know what part numbers to write down to order.

...wait...the tire is wider than the wheel because the tire is an inflated torus and so the wheel is a cylinder that isn't as wide. D'oh. I am stupid. Goddammit.
Maybe that's the relationship you don't understand. The width of the rim required for each tire is specified by the tire manufacturer; it's not a calculation from the tire size.

Each tire size has a range of rim widths (i.e. 8"-10") that are recommended for that tire. The narrower rim makes the tire bulge out slightly beyond the rim providing some protection for the rim. The wide end of the rim width spreads the tire out allowing for the tread to spread out more making better contact with the road. Most Jeep owners prefer the narrower wheels because they also help avoiding rubbing problems.

The AEV wheels are a good choice because they are designed for Jeeps and big tires. You can run any of 35" Crushers as long as they are for a 17" diameter rim on the AEV wheels. The AEV wheels are 8.5" wide which is within the recommended with range of the 35" Crushers.
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Old 02-04-2014, 02:09 AM
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Will those fit on the stock spare tire holder?
I seriously doubt it, but right now I'm looking at putting in the Rock Slide Engineering rear bumper and either the tire carrier or possibly the tire relocation bracket, but I want to talk to the guys at Rock Slide first. Either way, it won't be an issue.
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Old 02-04-2014, 09:56 AM   #9
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Okay, I don't know what magic trick you pulled there (how does 8.5" equal 12.5"? I don't get it!), but I'm happy I have an answer now and know what part numbers to write down to order.

...wait...the tire is wider than the wheel because the tire is an inflated torus and so the wheel is a cylinder that isn't as wide. D'oh. I am stupid. Goddammit.
Go back to the AEV listing and then click on the tech specs tab. That is where the numbers are.

Bob K.
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Old 02-04-2014, 09:58 AM   #10
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Will those fit on the stock spare tire holder?
The backspacing on them is 5+ inches. So they will fit. It will snug up on the bumper. And you made need to modify the tire stops on the tailgate. It will put more strain on the tailgate.


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Old 02-04-2014, 10:55 AM   #11
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Most tire specs list the proper wheel width it will fit, either diameter x width, e.g. 16x6, or width only.
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Old 02-04-2014, 11:15 AM   #12
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No one is stupid.. Just misinformed.. Often we all get mixed up on these types of issues, because the tire and rim manufactures tend/attempt to make it so difficult that we have to ask them for support by calling emailing etc..

Rule of thumb..

1) Find out what tire best suits you jeep. If the jeep isn't lifted sites like tirerack.com offer their views/suggestions when you enter all necessary data into her search engine.
2) If you jeep is lifted or going to be lifted, one will need to figure out how many inches.. Typically the non-lifted JK can handle 32'' tires with stock or aftermarket rims.. Meaning.. That if you've started out with 17'' rims.. Best stay with tires that will fit that 17'' rim. Some sites or even catalogs (4WD) has charts where they have done all the figuring and hard work for you. I'm not asking you to stay main stream.. just to view these charts to get an idea.
3) sites like General tire have their own charts which list tires that will work on particular rims etc and actually give you a range of widths that can be used on that rim.. Typically an average width is between 8.50 - 12.50 this means that the rim can withstand tires that can be no less than 8.50 and no greater than 12.50 when inflated on the rim.
4) If you've measured your rim and it states that it can handle a 9.00 tire, then according to the range I posted above would indicate that this tire will work on hat rim etc.
5) Going off road?.. Then you would have to consider a more tire than rim.. Meaning select a rim size 15 -16 etc which can handle a tire (more rubber) this is used to grab or handle extreme conditions the off road can throw at you. Even beach access.. In that case the tire would be deflated to 20 psi to handle the sand.
6) Staying on the street?.. then you should consider more rim that tire.. or the 17 - 19 rim size.. and less tire. Thou I don't agree with the 22'' rims and tires..

Here is an example from General tire for my current setup:

255/65R17 Measures - 31.0 | Tire Width - 10.2 | Max psi - 44 | Rim Size - 7.0 - 9.0

According to this sites chart.. The tires I'm interested in will work on my stock 17'' rims
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Old 02-04-2014, 11:30 AM   #13
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The tire width is measured at the tread not the bead that seats on the wheel. So the wheel will be narrower than the tire.
The tire width is actually measured at the widest point in the tire, which is not the tread. It's the middle of the "bulge" between the tread and the wheel. That's the "section width" that is the industry standard for measuring the width of a tire.

A 12.50" wide tire usually has around 10-11" of tread width or so (it varies between manufacturers and even between tire types made by the same manufacturer).

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