Question about Tires

[gunDriller]

These are the tires on my truck -
P235 70R16

And on my old car -
185 70R14

So what I was wondering is -

P185 75R14
P185 65R14
LT235 85R16

/\ would any of these be decent replacements for the tires I have ?

Which I guess is like asking, would they fit on my wheels ?

Thank you G-S.us'ers for any light you can shed on this semi-important semi-survival-related topic ! ;D

[Cebu_4_2]

the 14's will fit on the 14 rims, same with 16 and 16 :-\

only difference is how till and wide they are.

[SLV^GLD]

Pretty straightforward stuff here.

P### is the dimension, in millimeters, across the tread (section) from sidewall to sidewall.

##R is called the aspect ratio. It represents the height ,in millimeters, of the sidewall as a ratio of the section. You'll have to move the decimal back 2 places (that is multiply this number times .01)

The last two ##'s are the diameter of the wheel or basically, the size of the hole in the middle of the tire.

Soooo, if the truck is P235 70R 16 then you will HAVE TO match the last two numbers (16) or change your wheels. The tire is 9.25' (235/25.4) across the section and ~6.5" tall (235*.7/25.4). You can futz around with the section all you like. The wider it is the more traction you have but you up your rolling resistance (impacts mileage) and you get more noise especially during turning at low speeds. You generally want to stay pretty close to your spec'd sidewall height. Going lower reduces ground clearance and going higher can cause the tire to rub the wheel well especially during sharp turns. Major changes in sidewall height can affect speedometer/odometer accuracy.

Hope that helps.

[General of Darkness]

The P = Diameter
The R = Width of the tire

So the larger the R = the wider the tire, so as long as the rim width is rated for the larger width you should be good to go.

If I can make some recommendations.

Truck tires = BFG
Car tires = General

I've been using General tires on the 19" rims on my Porsche and they are lasting twice as long on the rears than the Pirellis etc and are about a third of the cost.

The BFG's are more expensive BUT, they last longer than any truck tire I've ever used.

[osoab]

Get Bias tires. :D

[General of Darkness]

Get Bias tires. :D


Osoab is this you getting rid of your old tires? ;D

http://yalibnan.com/site/archives/2008/05/07/black%20wednesday%2023.jpg

[osoab]

Get Bias tires. :D


Osoab is this you getting rid of your old tires? ;D

http://yalibnan.com/site/archives/2008/05/07/black%20wednesday%2023.jpg


Not me. I don't wear shirts with horizontal stripes. ;D

[iOWNme]

Basically the the 185's will be narrower than the 235's, and depending on how wide your wheel is, could be an issue. Most likely not though. Do you know how wide the actual wheels are?

Notice how small mail trucks, city meter readers, etc all have tiny little 13"-14" wheels with like 40 series tires on them. They get much better mileage than a massive tire.

Also, keep the air pressure up to the recommended level, this KILLS gas mileage if they get low, as it takes more power because the tires have more resistance.....FYI.




Next, install a turbo.

;D

[BillBoard]

P= stands for passenger vehicles

LT=for Light Truck tires

[BillBoard]

http://www.tire-information-world.com/

[Bullion_Bob]

These are the tires on my truck -
P235 70R16

And on my old car -
185 70R14

So what I was wondering is -

P185 75R14
P185 65R14
LT235 85R16

/\ would any of these be decent replacements for the tires I have ?

Which I guess is like asking, would they fit on my wheels ?

Thank you G-S.us'ers for any light you can shed on this semi-important semi-survival-related topic ! ;D


You have P235 (width) 70R (sidewall height) 16" (diameter) so you currently have 16" rims.

You will be looking at a 16" tire if you want to fit those rims. If you want a 17",18",19" tire you will need the same size 17', 18", 19" rims.

You will also want to keep your sidewall height and tire width the same at that size rim or you will throw off your speedometer as width, and sidewall variations change the tire circumference.

The result is you will either be going over or under what you speedometer says. No big deal on a manual transmission, as long as you don't go smaller as your odometer will accumulate miles faster. Not so great for resell. Automatics don't play so nice with changes to tire circumference like this.

When you upsize your rims to say 18" you will decrease the sidewall height or increase tire width to compensate depending on what your OEM tire circumference is, and what the speedo is calibrated for.

I just spent the day under my car upgrading my sway bars, and struts/springs. Tomorrow I'm pressing in some articulating spherical metallic bushings into the front control arms, and compression rod arms. I have 5 glorious days off to go a bit nuts on my car. A bit of a hobby I've developed over the years on all my daily drivers.

[hoarder]

As a rule, I never buy tires wider than 75. The 70's, 65's, 60's etc are for the purpose of fashion, not function.

The current fashion is to have a ridiculously short sidewall, and extra large diameter wheels to compensate. I call this "Nigger wheel syndrome".

[Bullion_Bob]

For sports cars 45's are a nice trade off for getting rid of that wallowy marshmallow feeling in the turns, with good pothole resistance. Anything thinner than that is called the idiots guide to rim repair 101.

For the ultra "gansta effect nigga wheel syndrome" get a set of these...I have yet to see anyone actually do this

http://www.youtube.com/watch?v=z48729NmusY

interesting technology though

[gunDriller]

Here are the tire sizes you posted (underlined is your stock size):

Specification Side Rad Diam Circ Revs/mi Difference

185/70-14 5.1in 12.1in 24.2in 76.0in 834 0.0%

185/75-14 5.5in 12.5in 24.9in 78.3in 809 3.0%

185/65-14 4.7in 11.7in 23.5in 73.7in 859 -3.0%


so it sounds like - i need 2 tires, and to use them both on the front or both on the rear ... maybe smaller diameter on the front, so the car front is lower ... i figure that's better than the car front being higher.

if i use just one tire and it has a different diameter ... sort of like a table with a leg that's too long or too short ... at 65 mph.

[midnight rambler]

For light trucks I've been using the Bridgestone Dueler A/T with the REVO tread design for years. The wet performance is nothing short of awesome.

http://www.bridgestonetire.com/productdetails/Home/Dueler_A/T_REVO_2_%28eco%29

[agnut]

Hi gunDriller; lots of good advice in your thread. I recently bought a set of tires for my 1 ton Dodge diesel truck. The recommended size was 235 85 R16. They were expensive locally so a friend told me where he bought his tires. I bought a set with no sales tax and free shipping. Yokohama was the manufacturer; they run smooth and quiet. Saved a couple of hundred bucks too. Hope this helps.

http://www.discounttiredirect.com/direct/home.do?vid=005486&yr=1991

Best wishes,

agnut

[Olmstein]

Without getting too technical, let me add that tires should be round and black. Hope this helps.

[TheNocturnalEgyptian]

I know I'm reposting, but you should get some of these:

http://news.cnet.com/i/bto/20081116/Humvee_tire_270x269.jpg

[gunDriller]

http://news.cnet.com/i/bto/20081116/Humvee_tire_270x269.jpg

those wheels - that is one humongous exquisite aluminum extrusion. I would ballpark the cost of the die to make that @ about $1 Million.