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Buying the right size tires

 
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Old 16 Jul 2012, 03:07 pm
Cruiszr's Avatar
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Default Buying the right size tires

I currently have 16" tires on my car and was wanting to move up to a 17". I happened to be in Sam's Club today and saw they were running a special on 17" BF Goodrich tires. The special price was $87.88 each and came in three different sizes, 215/45/ZR17, 235/45/ZR17, and 245/45/ZR17.

My question, which size should I buy for my Cruiser without worrying about tires rubbing. These tire are only on sale in the store as I checked their website and they are much hight in price.

In addition to the sales price BF Goodrich has a $50 instant rebate on four tires.

Could really use some help here.

Thanks
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Old 16 Jul 2012, 03:09 pm
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Default Re: Buying the right size tires

Well, first of all you can't put 17" tires on 16" wheels. If you want to move up to 17" tires, you need 17" wheels to go with them! After that, the discussion gets into offset, height vs. width, etc.
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Old 16 Jul 2012, 03:42 pm
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Default Re: Buying the right size tires

I looked at Discount Tires website and looked at their optional plus sizes. They only show the first two you list as being useable sizes. The first one you list is second on their list and your second one is fifth on their list. They show seven sizes as working on the cruiser.
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Old 16 Jul 2012, 04:33 pm
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Default Re: Buying the right size tires

Glad to see you're feeling better Chrome. I'm no mechanic but I do realize that a 17" tire want go on a 16" wheel.

My question was about the width of the tire (215,235,or 245 ) and what's the largest width tire I could put on without rubbing anything or bottoming out. I believe I had read somewhere that Cruisin said he had 215/??/17 on his car and could have put 225/??/17. Given that info I know that the 215/45/R17 would fit but didn't know about the other two. Didn't want to use the 215 if I could go to a large size if that makes any sence.

Is anyone running either the 235/45/R17 or the 245/45/R17 on their cruiser?

Thanks
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Old 16 Jul 2012, 06:05 pm
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Default Re: Buying the right size tires

Quote:
Originally Posted by Cruiszr View Post
Glad to see you're feeling better Chrome. I'm no mechanic but I do realize that a 17" tire want go on a 16" wheel.

My question was about the width of the tire (215,235,or 245 ) and what's the largest width tire I could put on without rubbing anything or bottoming out. I believe I had read somewhere that Cruisin said he had 215/??/17 on his car and could have put 225/??/17. Given that info I know that the 215/45/R17 would fit but didn't know about the other two. Didn't want to use the 215 if I could go to a large size if that makes any sence.

Is anyone running either the 235/45/R17 or the 245/45/R17 on their cruiser?

Thanks
The 215/45/17 will be about the same as 205/50/17 in height. The others will be noticeable on the speedo.
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Old 16 Jul 2012, 07:44 pm
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Default Re: Buying the right size tires

I'm running 225*45/17 Pirelli P6's. No rubbing, but I do bottom out, however that's because I cut my bump stop on the left rear about 1/4" too short when I lowered the car. Without it being lowered you'd never bump the tires at that size.

Now remember this guys, it's all just a matter of math! Size is in millimeters, it's just not been plainly explained that way. So here's how it goes, and how to tell if it'll fit.
  • 225/45*17 = 225mm wide (8.85") (across the surface of the tire), and it's height is 45% of 225mm, meaning it's height is 101.25mm (3.99").
  • 235/45*17 = 235mm wide (9.25") x 105.75mm tall (4.16")
  • 245/45*17 = 245mm wide (9.65") x 110.25mm tall (4.34")
So going from 225 to 245 mm wide, you're increasing from 8.85 to 9.65", not quite an inch, but that is going to be pushing it. Add to it, when you put a tire that's 225mm wide or wider, on a wheel that's 16" tall, that wheel needs to be 7" wide minimum or you'll end up with a bulge versus a flat tire surface.

So it's combination of things: wheel height, wheel width, wheel offset, tire height and tire width. You need to consider all of that when buying new tires.

That or go the easy route - 225/45*17's..... you can go taller, or shorter, but I'd personally not go any wider. Shorter = rougher ride, taller = softer ride but more bounce to the ounce. Wider = less fuel economy, but better traction in bad weather.

Personally, I shop at Discount Tire. In every situation where I've purchased tires over the past 12 years, they have matched and/or beaten any price I've brought in. I just spent $700 and change on my wife's T&C putting Michelin Defender's on it, simply because my family's life is riding in that van and I want them protected. I would have put the new Pirelli's on it, but they were just too expensive and more performance than safety. I shopped those tires everywhere, and ended up getting them for $158 each, more than I would normally or ever spend on my PT, but then my kids don't ride in my car often. Now BJ's Wholesale, similar to Sam's, has the same exact tires, Mich Defenders, same size 225/45*17, and they were $153 each. Rather than save $20 for four tires, I took my business back to Discount Tire, and they ended up throwing in new tire pressure sensors for free, so no matter what they're beating the competition. Oh, and they just like Sam's and BJ's have the $70 prepaid Visa card you'll get if you buy the Mich's.

Now if you go to their website and enter your vehicle, search for alternate tire sizes. The factory size sux big time. Here's their list based on a 17x7" wheel:
Quote:
Originally Posted by Discount Tire

Plus Zero
215/50-17
225/45-17
235/45-17
245/40-17
255/40-17

Plus One
225/40-18
235/40-18
245/35-18
255/35-18

Plus Two
235/35-19
255/30-19
What I'm seeing is 225 or 235/45's as being right in the middle. Good call, I got a lucky guess!

Last edited by Chromenut; 16 Jul 2012 at 07:58 pm.
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Old 16 Jul 2012, 08:23 pm
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Default Re: Buying the right size tires

Quote:
Originally Posted by Chromenut View Post
I'm running 225*45/17 Pirelli P6's. No rubbing, but I do bottom out, however that's because I cut my bump stop on the left rear about 1/4" too short when I lowered the car. Without it being lowered you'd never bump the tires at that size.

Now remember this guys, it's all just a matter of math! Size is in millimeters, it's just not been plainly explained that way. So here's how it goes, and how to tell if it'll fit.
  • 225/45*17 = 225mm wide (8.85") (across the surface of the tire), and it's height is 45% of 225mm, meaning it's height is 101.25mm (3.99").
  • 235/45*17 = 235mm wide (9.25") x 105.75mm tall (4.16")
  • 245/45*17 = 245mm wide (9.65") x 110.25mm tall (4.34")
So going from 225 to 245 mm wide, you're increasing from 8.85 to 9.65", not quite an inch, but that is going to be pushing it. Add to it, when you put a tire that's 225mm wide or wider, on a wheel that's 16" tall, that wheel needs to be 7" wide minimum or you'll end up with a bulge versus a flat tire surface.

So it's combination of things: wheel height, wheel width, wheel offset, tire height and tire width. You need to consider all of that when buying new tires.

That or go the easy route - 225/45*17's..... you can go taller, or shorter, but I'd personally not go any wider. Shorter = rougher ride, taller = softer ride but more bounce to the ounce. Wider = less fuel economy, but better traction in bad weather.

Personally, I shop at Discount Tire. In every situation where I've purchased tires over the past 12 years, they have matched and/or beaten any price I've brought in. I just spent $700 and change on my wife's T&C putting Michelin Defender's on it, simply because my family's life is riding in that van and I want them protected. I would have put the new Pirelli's on it, but they were just too expensive and more performance than safety. I shopped those tires everywhere, and ended up getting them for $158 each, more than I would normally or ever spend on my PT, but then my kids don't ride in my car often. Now BJ's Wholesale, similar to Sam's, has the same exact tires, Mich Defenders, same size 225/45*17, and they were $153 each. Rather than save $20 for four tires, I took my business back to Discount Tire, and they ended up throwing in new tire pressure sensors for free, so no matter what they're beating the competition. Oh, and they just like Sam's and BJ's have the $70 prepaid Visa card you'll get if you buy the Mich's.

Now if you go to their website and enter your vehicle, search for alternate tire sizes. The factory size sux big time. Here's their list based on a 17x7" wheel:


What I'm seeing is 225 or 235/45's as being right in the middle. Good call, I got a lucky guess!
What is the plus 1 2 3 about?
__________________

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__________________________________________________ __________________________________________________ ___________Performance, Body and Service, OEM

This Is my project page.
http://www.ptcruiserlinks.com/forum/...oject-1-a.html

This is a great read from one of our own! Badglas
badglas.blogspot.com
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Old 16 Jul 2012, 09:27 pm
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Default Re: Buying the right size tires

If Sam's Club offered the 225/45/17 I would go with that size but they don't offer it in the club so my next choice is the 235/45/17 which they do have available. I checked with the Tire Rack and the cost of the four BF Goodrich g-Force comp-2 tires with shipping will cost me $550.06. The price for the same four tires at Sam's Club is $369.09 with tax. If I get $50. instant rebate from both the prices would be $500.06 and $319.09 a difference of $180.97 or $45.24 per tire. I know that Sam's Club charges $15. per tire for mounting, balance, stims. Free balancing every 5000 miles . Don't think they will mount anyone else's tires. Would have to pay about the same to have mounted if I got from Tire Rack.

If I ordered the tire from Sam's Club website the cost is $131 per tire. The store price $87.88 or $44. per tire cheaper in the store don't know why. Don't know about the tps stims but would probably be about the same where ever I got them mounted at.

Maybe $180 is chicken feed to a lot of you but on my fixed income it makes a difference. Just seems like a no brainer to me, but I could be wrong!

I guess I could go for recaps if they still make them, like in the good old days where they were the cheapest thing around
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Old 17 Jul 2012, 02:40 am
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Default Re: Buying the right size tires

Quote:
Originally Posted by Busted_PT View Post
What is the plus 1 2 3 about?
Tire & Wheel Plus Sizing - Discount Tire

Cruiszr,

225s or pretty much the normal aftermarket size. Tire Rack will recommend you 235s which is better w/o a drop. The 215s will be cheaper.
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