what the printed info on tires refers too! and related info

[grumpyvette]

interesting tire comparator
http://www.discounttire.com/dtcs/infoTireMath.dos

tire age vs safety
https://www.edmunds.com/car-maintenance/how-old-and-dangerous-are-your-tires.html

https://www.consumerreports.org/tires/when-to-replace-your-tires/

https://www.merchantsgroup.com/10-tips-tire-safety-1/

https://www.autoblog.com/2014/01/29/replacing-your-tires/



http://tire-size-conversion.com/tire-height-calculator/

http://edis.ifas.ufl.edu/HE727

http://abcnews.go.com/Video/playerIndex?id=4826897

http://www.tirerack.com/tires/tiretech/ ... p?techid=7

http://www.tirerack.com/tires/tiretech/ ... ?techid=11

http://www.tiresizecalculator.info/

viewtopic.php?f=71&t=1071&p=2055#p2055

http://www.pozziracing.com/12_corvette_ ... n_fgen.htm

http://www.harriger.com/tires.htm

http://www.nhtsa.gov/cars/rules/manufacture/index.html

http://home.netcom.com/~sgalaba/tiresize.htm

http://www.tirerack.com/tires/tiretech/ ... ?techid=53

http://www.carcraft.com/techarticles/3636/

http://www.high-impact.net/wheels/backspacingillustration.htm

http://www.custom-wheels-n-rims.com/WheelTech/wheel-backspace.htm

http://www.rsracing.com/tech-wheel.html#backspace

http://www.kormanfastbmw.com/ttiredia.htm

http://www.rsracing.com/rscatalog/prod-index.asp

http://www.rsracing.com/glossary.htm#patch

http://www.miata.net/garage/tirecalc.html

http://www.geocities.com/steve.knickerbocker/tires/tirediam.htm

https://www.tirerack.com/tires/tire...0920365!b!!g!!+tire +load +index&gclsrc=aw.ds

http://www.yournexttire.com/load-speed-ratings/

Load Index - The weight a tire is rated at. Multiply number x 4 for total vehicle.

Ply Ratings – P.R. or Ply Ratings on tires are now used in comparison for what used to be termed as plies.

Speed Ratings – It indicates the maximum speed at which the tire can carry a load corresponding to its Load Index.

Tire Diameter Page
Tire
designator Tire
diameter Tire
designator Tire
diameter Tire
designator Tire
diameter
P155/80R13 22.76 B60-14 21.74 H60-14 24.26
P165/60R15 22.80 B60-15 22.74 H60-15 25.26
P165/70R13 22.09 B70-14 23.03 H70-14 25.97
P165/80R13 23.39 B70-15 24.03 H70-15 26.97
P175/70R13 22.65 B78-14 24.06 H78-14 27.34
P175/80R13 24.02 B78-15 25.06 H78-15 28.34
P185/70R13 23.20 C60-14 22.34 J60-14 24.50
P185/70R14 24.20 C60-15 23.34 J70-14 26.25
P185/75R14 24.93 C70-14 23.73 J78-14 27.65
P185/80R13 24.65 C70-15 24.73 L60-14 24.68
P195/60R14 23.21 C78-14 24.84 L60-15 25.68
P195/60R15 24.21 C78-15 25.84 L70-14 26.46
P195/70R13 23.75 D60-14 22.58 L78-14 27.88
P195/70R14 24.75 D60-15 23.58 M60-14 25.22
P195/75R14 25.52 D70-14 24.01 M60-15 26.22
P205/60R13 22.69 D70-15 25.01 M70-14 27.09
P205/70R14 25.30 D78-14 25.15 M70-15 28.09
P205/75R14 26.11 D78-15 26.15 M78-14 28.59
P205/75R15 27.11 E60-14 22.82 M78-15 29.59
P215/60R14 24.16 E60-15 23.82 N60-14 25.76
P215/65R15 26.00 E70-14 24.29 N60-15 26.76
P215/70R14 25.85 E70-15 25.29 N70-14 27.72
P215/75R14 26.70 E78-14 25.47 N70-15 28.72
P215/75R15 27.70 E78-15 26.47 N78-14 29.29
P225/60R15 25.63 F60-14 23.24 N78-15 30.29
P225/70R14 26.40 F60-15 24.24
P225/70R15 27.40 F70-14 24.78
P225/75R15 28.29 F70-15 25.78
P235/60R14 25.10 F78-14 26.01
P235/60R15 26.10 F78-15 27.01
P235/70R15 27.40 G60-14 23.78
P235/75R15 28.88 G60-15 24.78
P245/50R16 25.65 G70-14 25.41
P245/60R14 25.57 G70-15 26.41
P245/60R15 26.57 G78-14 26.71
P255/50R16 26.04 G78-15 27.71
P255/60R15 27.05
P255/70R15 29.06
P275/60R15 27.98


http://www.dougrippie.com/drm/brake_conversions.htm#C4 Corvette DRM Wilwood Brake Kit

ll four tires on a vehicle should be the same size and type. Select the type and quality tires needed for the intended use of the vehicle. How fast do you drive, what type of loads do you carry, what about breaking/stopping quality and how many miles do you want your tires to last? Information printed on the sidewall and label of tires can help you compare different brands and types of tires. This information includes:

*

Tire size – written as a series of letters and numbers, example P195/70R14 90S. The 195 is the cross-section measurement of the tire in millimeters and 70 is the height of the tires sidewall compared to the tires width. The sidewall is 70% as high as the tire is wide.
*

Type of tire – in the P195/70R14 example P stands for passenger car tire. If the tire was for a light truck such as a pick-up it would be LT instead of P.
*

Construction - in the P195/70RI4 R stands for radial ply tire. Most tires are radials.
*

Wheel size – in the P195/70R14 example 14 is the diameter of the wheel in inches. If it were a 12-inch wheel the number would be P195/70R12.
*

Load range – in the 9195/70R14 90S example 90 is the code for the maximum load or weight the wheel will carry safely (1312 pounds). Notice this information is also repeated on the sidewall, “max load 595 kg (1312 pounds). Different numbers are used to identify different load ranges.
*

Speed rating – in the P195/R14 90S example S identifies the maximum number of miles per hour the traveler can travel safely. S stands for 112 miles per hour. Other ratings are: T = 118 mph; H = 130, V = 149, and ZR = 150 or more.
*

Maximum air pressure – (taken when cold) stated as pounds per square inch (PSI). The air pressure should not exceed the number of PSI listed on the sidewall of the tire, example 35 PSI. For general driving you should use the air pressure recommended in your cars operator manual or on the sticker on the door jam or the glove compartment.
*

Traction – is a rating score for government required tests on wet pavement . Traction is the stopping and holding capabilities of the tires. Ratings range from C to AA. Look for at least an A in traction.
*

Temperature – is also a government required rating score for heat buildup inside a tire. This is especially important when a tire is under-inflated or carrying a heavy load. Heat destroys tires and can cause blow-outs. Look for at least a B in temperature rating.
*

Treadwear – relates to how quickly the tread wears on a tire and how many miles the tire will last. This is expressed as a number. The minimum standard is 100. The higher the number the longer the tread will last. A tire with a 400 rating will last much longer than the tire with a 200 rating.
*

DOT – stands for Department of Transportation. This code identifies the plant and date including week and year that the tire was manufactured. This code is used if a tire is recalled.




Using a P195/60R15 87S tire size as our example, the 87S at the end of the size represents the tire's service description. A service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since 1991.

The first two digits (87S) represent the tire's load index and are followed by a single letter (87S) identifying the tire's speed rating.

"Using a P195/60R15 87S tire size as our example, the 87S at the end of the size represents the tire's service description. A service description identifies the tire's load index and speed rating."

Load Index
P195/60R15 87S - The load index (87) is the tire size's assigned numerical value used to compare relative load carrying capabilities. In the case of our example, the 87 identifies the tire's ability to carry approximately 1,201 pounds.

The higher the tire's load index number, the greater its load carrying capacity.

89 = 1,279 pounds
88 = 1,235 pounds
87 = 1,201 pounds
86 = 1,168 pounds
85 = 1,135 pounds

A tire with a higher load index than that of the Original Equipment tire indicates an increase in load capacity. A tire with a load index equal to that of the Original Equipment tire indicates an equivalent load capacity. A tire with a lower load index than the Original Equipment tire indicates the tire does not equal the load capacity of the original.

Typically, the load indexes of the tires used on passenger cars and light trucks range from 70 to 126.

Load Index Pounds Kilograms Load Index Pounds Kilograms Load Index Pounds Kilograms
70 739 335 89 1,279 580 108 2,205 1,000
71 761 345 90 1,323 600 109 2,271 1,030
72 783 355 91 1,356 615 110 2,337 1,060
73 805 365 92 1,389 630 111 2,403 1,090
74 827 375 93 1,433 650 112 2,469 1,120
75 853 387 94 1,477 670 113 2,535 1,150
76 882 400 95 1,521 690 114 2,601 1,180
77 908 412 96 1,565 710 115 2,679 1,215
78 937 425 97 1,609 730 116 2,756 1,250
79 963 437 98 1,653 750 117 2,833 1,285
80 992 450 99 1,709 775 118 2,910 1,320
81 1,019 462 100 1,764 800 119 2,998 1,360
82 1,047 475 101 1,819 825 120 3,086 1,400
83 1,074 487 102 1,874 850 121 3,197 1,450
84 1,102 500 103 1,929 875 122 3,307 1,500
85 1,135 515 104 1,984 900 123 3,417 1,550
86 1,168 530 105 2,039 925 124 3,527 1,600
87 1,201 545 106 2,094 950 125 3,638 1,650
88 1,235 560 107 2,149 975 126 3,748 1,700
Calculating Approximate Tire Dimensions

• Contact Patch

• Plus Size Wheels & Tires

• Tire Size Conversion Chart

• Tire Size Guide

SERVIC

 

[grumpyvette]

Re: what the printed info on tires refers too! and related i

related info
viewtopic.php?f=87&t=8480&p=29756&hilit=leak+seal#p29756

"My tires are have a brown residue on them, what can I do to fix them?"

Modern rubber compounds are pretty interesting and very complex, far more than most people realize. The stresses today's cars put on rubber are far higher than ever before. Higher speeds, more torque, higher heat, longer miles, stronger lateral forces, more driving. We expect tires to put up with all of it as our cars get faster and more powerful, but rarely do we take the time to understand what exactly has changed about tires other than going from bias ply to radial in the late 1960's.

ANTI-OZONANT
An anti-ozonant, is an organic compound added to materials that prevents or slows the deterioration caused by exposure to the elements. As we all have experienced with plastic or rubber trim on our cars it oxidizes over time and can become faded, chalky, or even brittle and cracked. Anti-ozonants are used as an additive in most all of the exterior rubber and plastic parts to one degree or another, but they are most prevalent in tire manufacturing.

Without the addition to anti-ozonants to modern tires it would be highly unlikely we'd have high mileage tires. Performance cars would shred tires incredibly fast after just a few high speed turns or long track runs where the tires were heated up. Even your daily driver, or commuter car would need tires far more often as the sun and heat slowly rotted away the rubber compounds.

The addition of anti-ozonants to modern tires has allowed tire performance to keep up with the demands of ever increasing levels of power or strain placed thru them as a result of improved vehicle performance.

TIRE BLOOMING
Todays rubber is designed intentionally in a manner that allows the anti-ozonant constantly to work its way to the outside of the tire and as such, continually keeps the outer surface and sidewall pliable and resistant to oxidation.

After the anti-ozonant works its way to the outside of the tire and is exposed to air it oxidizes, and begins to turn brown. The term for this ugly brownish tire look is blooming. As you know, oxidation is a chemical reaction. An unplated nail left exposed to the outside world will slowly begin to rust (oxidize) as it is exposed to water and air.

Anti-ozonant has a similar problem. Exposure to air and water will cause the exposed anti-ozonant to oxidize and leave a rusty brownish residue behind. The longer a tire goes between thorough cleanings the more likely it is to begin to display blooming.

Compounding the issue is the use of mold releases in modern tire manufacturing processes. These lubricant type chemicals provide a non-stick surface for the inside of a tire production mold. The problem becomes their ability to bond with the tire and hold anti-ozonants onto the surface of the tire. Some detailing experts will point to mold release as the primary and only source of tire blooming, which is incorrect. Even after the removal of mold release a tire will begin to leach anti-ozonant to the surface allowing the brown residue to return.

WHEEL CLEANERS AND THEIR ROLE

Cleaning compounds used to dissolve metallic contamination (like Active Wheel Cleaner Plus) can have an accelerating effect on the anti-ozonant as they are essentially an oxidizer. The reaction you see when brake dust it turned to a reddish slurry by Active Wheel Cleaner Plus or a similar product is, in a very simplified way, oxidation. The chemical reacts with the metallic particle and begins to dissolve it.

Tires that have not been cleaned properly or have been neglected for long periods of time will have substantial amounts of the anti-ozonant on the surface. When an oxidizing wheel cleaner comes into contact with this buildup it will accelerate the browning or blooming.

To this end it becomes imperative to regularly scrub tires to remove the buildup of anti-ozonant and 'dead' rubber compound, especially if you are a fan of Active Wheel Cleaner Plus or similar cleaners for their ability to remove stubborn brake dust from wheels.

Does this necessarily mean you should discontinue the use of active wheel cleaners? No, but they should be used with the understanding that the tire needs deep cleaning either before or after the wheel to remove any residues or prevent tire blooming acceleration as a result of the oxidation process.


THE SILICONE SCAPEGOAT

There are those in the detailing business that would have you believe that silicone based tire dressings are the culprit for brown tires. While silicone can be a messy and sticky solution to making your tires shine it isn't always the main culprit.

Most browning as a result from silicone will be due to the tendency of silicone to be wet and greasy, thus holding dirt and debris on the tires surface. This type of contamination is generally easy to remove as silicone dressings also remove with scrubbing and a degreaser.

This doesn't necessarily mean that you should immediately start to treat your tires with silicone, there are still many reasons its a less than ideal way to dress your tires, but don't let any less qualified individuals lead you to believe that your choice of tire dressing is the ONLY source for the brown residue.

REMOVING THE BLOOMING

To remove the brown residues a strong degreasing agent, such as APC Concentrate, and abrasive scrubbing of the tires surface is recommended. Stiff bristle brushes along with the degreaser will cut thru the oxidized anti-ozonant typically in 1 to 2 treatments. Be sure after each scrubbing that the tire is rinsed well with clean water to remove the cleaning agents as well as the residues that have been freed from the tire.

Once the brown residues are removed regular cleanings with a water based degreasing agent and application of water based tire protectant, like Tire Dressing & Conditioner, is recommended to prevent and/or slow the process. Even perfect care cannot always 100% prevent the return of the brown blooming issue in some tire compounds.

Because anti-ozonants actively continue to leach their way towards the outside of the tire even a car which sees very little use or doesn't have very dirty tires may experience tire blooming when eventually exposed to oxidizers due to lack of cleaning. As such it is recommended that even relatively clean tires be treated to a semi-regular scrubbing to remove the anti-ozonants from the outer layer of the tire sidewalls.

http://garage.grumpysperformance.com/index.php?threads/wheel-studs-and-replacement.4414/#post-55060

First, watch this video!

There is a plethora of information about this at Tire Rack's website but I want to bring some of the juicy stuff here. This is information that every high performance car owner should know. I'm not advocating that you buy for them, just read the information and educate yourself. Then take that information to TD4L! Mention DC and they might hook you up! I don't know that for a fact but hey, it's worth a try!

First off, determining the age of your tires.

When it comes to determining the age of a tire, it is easy to identify when a tire was manufactured by reading its Tire Identification Number (often referred to as the tire’s serial number). Unlike vehicle identification numbers (VINs) and the serial numbers used on many other consumer goods (which identify one specific item), Tire Identification Numbers are really batch codes that identify the week and year the tire was produced.

The U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA) requires that Tire Identification Numbers be a combination of the letters DOT, followed by ten, eleven or twelve letters and/or numbers that identify the manufacturing location, tire size and manufacturer's code, along with the week and year the tire was manufactured.

Tires Manufactured Since 2000

Since 2000, the week and year the tire was produced has been provided by the last four digits of the Tire Identification Number with the 2 digits being used to identify the week immediately preceding the 2 digits used to identify the year.

Example of a tire manufactured since 2000 with the current Tire Identification Number format:

While the entire Tire Identification Number is required to be branded onto one sidewall of every tire, current regulations also require that DOT and the first digits of the Tire Identification Number must also be branded onto the opposite sidewall. Therefore, it is possible to see a Tire Identification Number that appears incomplete and requires looking at the tire’s other sidewall to find the entire Tire Identification Number

The use of a partial Tire Identification Number on the one sidewall (shown above) reduces the risk of injury to the mold technician that would have to install the weekly date code on the top sidewall portion of a hot tire mold.

Tires Manufactured Before 2000

The Tire Identification Number for tires produced prior to 2000 was based on the assumption that tires would not be in service for ten years. While they were required to provided the same information as today’s tires, the week and year the tire was produced was contained in the last three digits. The 2 digits used to identify the week a tire was manufactured immediately preceded a single digit used to identify the year.

Example of a tire manufactured before 2000 with the earlier Tire Identification Number format:

While the previous Tire Identification Number format identified that a tire was built in the 8th year of a decade, there was no universal identifier that confirmed which decade (tires produced in the 1990s may have a small triangle following the Tire Identification Number to identify the decade).

And finally, hold on to your sales receipt. Most tire manufacturer's warranties cover their tires for four years from the date of purchase or five years from the week the tires were manufactured. So if you purchase new tires that were manufactured exactly two years ago they will be covered for a total of six years (four years from the date of purchase) as long as you have your receipt. If you lose your receipt, your tires' warranty coverage will end five years from the week the tire was produced (resulting in the tire manufacturer's warranty coverage ending only three years from the date of purchase in this example).

:cheers:

The Junkman

As you load your car trailer, you need to keep in mind that about 60% of the cargo weight should be loaded in the front half of the trailer.
or slightly forward of the axle centerline, any decently set up car transport trailer will have TWO 2500 lb or higher rated axles so 4 wheels support the cars weight, and the trailer should have high efficiency electric brakes on both trailer axles and obviously the correct trailer hitch, and signal and brake lights,
Heavier items should be loaded in the front, with lighter, smaller items placed near the rear. ... Once you've loaded your trailer, it's time to check that cargo weight is distributed properly.

YOULL EVENTUALLY WANT TO VERIFY TIRE TOO WHEEL WELL CLEARANCE ISSUES

https://www.rsracing.com/TechWheel.aspx

http://www.streetortrack.com/Wheelrite-Wheel-Tire-Simulator-RENTAL-pr-23561.html

http://www.dragzine.com/project-cars/tech-how-to-clearance-fox-body-mustang-wheel-wells/

http://www.hotrod.com/how-to/wheels-tires/ccrp-0610-muscle-car-performance-wheels-fitment/

http://garage.grumpysperformance.com/index.php?threads/wheel-studs-and-replacement.4414/#post-11609

http://www.bigblockdart.com/techpages/wheelspacing.shtml

http://tunertools.com/articles/Wheel-Fitment.asp

http://www.thewheelfit.com/wheel-dimensions.html

http://www.thewheelfit.com/wheel-fit-kits.html

http://www.1010tires.com/Tools/Wheel-Offset-Calculator

http://garage.grumpysperformance.co...r-tire-clearance-and-suspension-changes.2029/

http://garage.grumpysperformance.com/index.php?threads/tires-and-tire-compounds.1676/#post-4071

http://garage.grumpysperformance.com/index.php?threads/under-car-safety.26/#post-1040

http://garage.grumpysperformance.com/index.php?threads/you-need-decent-jack-stands.672/#post-929

http://garage.grumpysperformance.com/index.php?threads/wheel-studs-and-replacement.4414/#post-55060

BTW if your building a car from scratch, a set of car skates that allow you to push it anyplace in the shop and a set of sturdy 12 ton jack stands and a decent floor jack will be very useful.

one more reason in an endless list of reasons to own a welder and accurate measuring tools

you can either spend $90 on a $10 worth of cheap plastic to get a tool to check tire too wheel well clearance OR

these guys sell steel wheel spacers so you can weld up a custom tool
http://chassisengineering.com/index.php?route=product/product&path=4_102&product_id=70

you can spend some time cutting and welding and accurately measuring a couple of pieces of fairly cheap steel to make your own much more durable version

 

[philly]

Re: what the printed info on tires refers too! and related i

took alot away from that... especially understanding whats happening when i clean wheels and tires

 

[Grumpy]

https://www.nittotire.com/passenger...MIkamw25b04wIVhZ6fCh3KGw1vEAAYASAAEgIkofD_BwE

https://www.carid.com/2017-chevy-corvette-tires/

https://tires.tirerack.com/tires/Corvette C4

https://tech.corvettecentral.com/2012/01/c4-c6-corvette-tire-fitment-guide/

Corvette c4 tire size
1989
Front Wheel Size 17 X 9.5 17 X 9.5
Front Offset +56mm +56mm
Front Tire 275/40ZR-17 275/40ZR-17
Rear Wheel Size 17 X 9.5 17 X 9.5
Rear Offset +56mm +56mm