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Yet another tire/wheel question


Brandy

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Hi all - After having PepBoys mangle my fireglass airdam, and then backing off on replacing it (it wasn't new), I'm debating getting another airdam in the future but will be recovering the front with the lower valence. At the time I was crawling under the front end, I realized that the beautiful almost new tires (Road Hugger[?]) are 13"s, which is another reason why the car sits pretty low.

The rims are supposedly (the PO has almost zero credibility at this time so everything he has so far told me is suspect - with reason), dealer-installed optioned, and I like them (you can view them at my cardomain site), so I might keep them.

However, I'd like to replace these tires with either 14s or 15s (if possible), and done as painless as possible (no cutting or adding of other equipment). At this time I'm clueless as to what would fit and what would look nice. Any pointers would be appreciated.

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You can find 14" or 15" wheels for a 240Z, but not very many different styles are available since most modern cars are Front Wheel drive and require a much different offset (wheel construction) than rear wheel drive cars like Z's. Prices will be fairly high for most wheels also. Figure between $400 and $1500 for most wheels. You can spend more.

As for what would look nice, well that is very subjective. Look through our Gallery and you'll get an idea. Also check Motorsport Auto's website. They sell several wheels for Z's www.zcarparts.com

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Wow, you're quick - and loaded with info - thanks, Carl. :cheeky:

I'm going to stay with the rims for the time being (I love th erims listed in the MSA catalog, but I'd have to sell bodyparts to afford a set right now), but since I know next to nothing about tire size and width, I'm still at a loss as to what size(s) of tires I can fit on the car. Considering the constantly-growing list of things to check for with this car, I'd like to put new tires on it, at the same time get the brakes checked out (again, supposedly new, but they squeal like a fatally stuck pig), and a wheel alignment.

I live in southmost TX where good mechanics who can work on cars older than 5 years are rare, so I may have to settle for a company like Firestone (who did, to their credit, double-check to see if they can do an alignment, unlike PepBoys, which I hate with a passion).

I just can't figure the difference in reading a tire size, like 175/80/14 versus 180/65/14, and so forth. I just want to be sure I have all the information I need before I set foot again in another car shop. I'm going to measure the rim width when I get home, and according to other posters on this site, it might be either a 4.5 or 5, so that's a start.

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You can also learn a lot about tires and wheel at www.tirerack.com

On their home page look for "Shopping Tools" at Right side of Page header. Hover your mouse over it and a drop down menu should appear. Select "Tech Center" at the bottom of the drop down. That will take you to a page with links to lots of information. It may seem overwhelming, but just look around and you should be able to find the information you want. If not, ask here and someone will be able to help you.

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Hey Brandy,

You mention- get the brakes checked out (again, supposedly new, but they squeal like a fatally stuck pig). When you look over your front brakes, check to see if there is a thin metal shim between the pads and the caliper pistons that squeeze your brake pads. Ofter over the years people leave them out or forget to re-install them when they do a brake job. These shims and some brake grease will stop the squeal that Zs are known for. I had the same problem and sure enough once replaced the squeal was gone. Your brakes may be fine and just need a set of shims?

The shims are also found at MSA for about $19 to $20.00 for Right & Left set together. I purchased a set last month. There are acouple other items in the kit like the pins that the pads hang from that should be installed too, nice to freshen them up too. Old ones get worn & rusty not letting the pads slide or return after brakes are applied.

Good Luck.

Craig

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ooh, boy, more things to check out. Actually, we (hubby and I) will most likely pull the tires off one by one BEFORE we bring it to a shop (yet another one) to have new tires put on, or at the least to get the alignment and brakes checked.

And this page will be printed out and all requirements followed to the hilt.

Thanks.

But I still don't know how to pick the right size/width tires.....?

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Width of wheel (and offset of wheel) , and height of tire sidewall will determine min. and max. width of tire that will fit inside the fenders.

On a 14" tall wheel the tires sizes that I have used are 195/70 X 14, or 205/60 X 14. They were mounted on 5" to 7" wide wheels.

I have no experience with 13" wheels on a Z.

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Width of wheel (and offset of wheel) , and height of tire sidewall will determine min. and max. width of tire that will fit inside the fenders.

On a 14" tall wheel the tires sizes that I have used are 195/70 X 14, or 205/60 X 14. They were mounted on 5" to 7" wide wheels.

I have no experience with 13" wheels on a Z.

As far as I can tell, 13"s weren't supposed to be on the car (PO was a cheapo). I'm going to see if I can sell the tires locally (tons of Ford Fiestas around here), and get a new set of tires - thanks, the 'complete' size was what I needed!

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...I'm getting a headache....numbers numbers everywhere...

(This is almost fun)

What I might end up doing is either running the 13" tires presently on the car to the ground (shame, really, since the tires are almost new, since I've yet to put 100 miles on the car since I got it - last year(!)), or sell the rims with the tires and get a new/fairly good used set of rims with new tires.

Whatever I do, I'm printing out this entire page to take the several tire shops in the area (Firestone, TireRack - their webpage won't give me info on the '70 240Z), and see which is the first one with mechanics who seem to know what they're doing, and go from there.

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Brandy,

I'm reading and reading, and then I linked over to have a look at Ruby, and I have some basic confusion. Lets get some terminology straight, first. The wheel is the round metal thing that bolts on to the car. The tire is the rubber stuff filled with air that goes around the wheel. Wheels on a stock 240Z are 14" in diameter and 4-1/2" wide. Datsun 240Zs never had 13" wheels. Ruby looks like she already has 14" wheels. Go measure the diameter. 14" wheels are not very common any more and most people are buying 15" diameter new wheels to fit the Z. Used 14" wheels are quite common and Ruby will fit into a size 4-1/2" to 6" width without any problem. She could also wear a 15" wheel in those widths without any big deal. In used 14" wheels, some of the hottest fashions are "slots", "ARE Libres", and "Watanabes" in my opinion.

Now lets talk tires. The stock tire was a 175 /60SR14, but that isn't made anymore. 195 /60SR14s replace that old size and fit best on a 4-1/2" wide wheel. If you go over to the Tire Rack site, you can read about the size of the tire versus the width and what all those numbers mean. Check this site out also. http://www.powerdog.com/tiresize.cgi Keep in mind that Ruby's speedometer is set up for the original 175 size tire on a 14" diameter wheel and the resultant overall diameter. You want to stay as close to that diameter as you can. Around 22.3 inches.

So if you go with a larger diameter wheel, you will want a lower profile tire. Wider wheels will demand a wider tire. Have fun.

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The wheels on "Ruby" don't look like factory wheels. They apear to be aftermarket wheels. I don't know about people in FL, but back in the day, a certain number of CA owners did put 13" wheels on their Z's for some unGodly reason that I have no clue about. Tire Size ( and thus wheel diameter) is easy to confirm, it's printed all over the the sidewall of the tire.

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Another question, what is the difference between W and Y rated tyres?

Thanks, Justin

Speed Rating

The speed rating denotes the speed at which a tire is designed to be driven for extended periods of time. The ratings range from 99 miles per hour (mph) to 186 mph. These ratings are listed below.

Note: You may not find this information on all tires because it is not required by law.

Q 99 mph H 130 mph

R 106 mph V 149 mph

S 112 mph W 168 mph*

T 118 mph Y 186 mph*

U 124 mph

*For tires with a maximum speed capability over 149 mph, tire manufacturers sometimes use the letters ZR. For those with a maximum speed capability over 186 mph, tire manufacturers always use the letters ZR.

Quote from safercar.gov

Chris

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  • 2 years later...

Hi all,

my question is the following

i have bought 16x7 koning wheels for my car, and i want to install the following tire size: 225/50/16, does anybody knows if this size will work well on my car? I will aprreciate any advise

Thanks

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Hi all,

my question is the following

i have bought 16x7 koning wheels for my car, and i want to install the following tire size: 225/50/16, does anybody knows if this size will work well on my car? I will aprreciate any advise

Thanks

Yes, they will work, but you might, or might not have to roll your rear fender lips a bit. I have the same size tires on Panasports and they rub just a bit. Some people report a rub with that size and other don't. The interference is very minor which would explain the different results.

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  • 3 years later...

Now lets talk tires. The stock tire was a 175 /60SR14, but that isn't made anymore. 195 /60SR14s replace that old size and fit best on a 4-1/2" wide wheel. If you go over to the Tire Rack site, you can read about the size of the tire versus the width and what all those numbers mean. Check this site out also. http://www.powerdog.com/tiresize.cgi Keep in mind that Ruby's speedometer is set up for the original 175 size tire on a 14" diameter wheel and the resultant overall diameter. You want to stay as close to that diameter as you can. Around 22.3 inches.

I want to make sure this is correct? In my glove box it reads 175HR14 or 6.45H14. Cause if this is the case, my 205/60/15 tire is running about 9% slower than OE. So that means if my speedo reads 65mph on the freeway, in actuality I'm only doing about 59mph. I'm going to drive faster if that is the case ;)

Will the variance effect my braking ability? Our cars didnt come with ABS right?

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Stock Tire - 175/60R14 >

Tires Tire 1 - 205/60R15 >

Section Width: 6.88 in 175 mm

Section Width: 8.07 in 205 mm

Rim Diameter: 14 in 355.6 mm

Rim Diameter: 15 in 381 mm

Rim Width Range: Unrecognized tire size.

Rim Width Range: 5.5 - 8 in

Overall Diameter: 22.26 in 565.40 mm

Overall Diameter: 24.68 in 626.87 mm

Sidewall Height: 4.13 in 104.90 mm

Sidewall Height: 4.84 in 122.93 mm

Radius: 11.13 in 282.70 mm

Radius: 12.34 in 313.43 mm

Circumference: 69.93 in 1776.2 mm

Circumference: 77.53 in 1969.2 mm

Revs per Mile: 934.4

Revs per Mile: 842.7

Actual Speed: 60 mph 100 km/h

Speedometer1: 54.1 mph 90.1 km/h

Speedometer Difference: - Speedometer Difference: 10.88% too slow

Diameter Difference: - Diameter Difference: 9.81%

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Wrong. The stock size is/was (the now obsolete) 175SR14 or 175HR14 (depending on year). That is equivalent to 175/80-14 in today's sizing, not 175/60-14.

Thats why I was asking for clarification if what 26th-Z posted is correct. Read my original post with the quote. Ok, good to know its 175/80/14, thx!

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