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04-08-2002, 11:01 PM
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#1 |
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Registered User
Join Date: Jun 2001
Location: Springfield, MO
Posts: 1,098
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Numbers in Tire Sizes
In relation to the post below. (don't laugh) What do the numbers in tire sizes stand for? No one has ever told me and I have never asked until now.
http://67-72chevytrucks.com/board/ub...ML/021516.html ------------------ Nick Rodenberg Wellington, MO http://nickrod.port5.com You can click on "My 72 Chevy Truck" I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny. White/Ochre/White Runs well... working on body. Hoping to have completed in March when I turn 16
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Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!! |
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04-08-2002, 11:05 PM
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#2 |
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Progress = 0%
Join Date: Nov 2001
Location: Kansas City, MO
Posts: 2,108
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An example... 285/40/18
285 = the width in millimeters 40 = the sidewall height aspect ratio. In this example, 40 means 40% of the width (285) 18 = is obviously the wheel diameter ------------------ Current project: The "HACKstoration" 1967 GMC shortbed/fleetside, 350/700R4, air bag suspension, 18" billet wheels. Other vehicle of interest: 1957 Chevy Bel-Air 4dr hard top, 283/powerglide, lowered 3-1/2" in front and 2 inches in the rear. Web Site: jaySpot.com AOL Screen Name: Slammed67GMC Location: Kansas City, MO
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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra |
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04-08-2002, 11:06 PM
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#3 |
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Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,979
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Nick; check this site out should help; http://www.dunloptire.com/tires/Rover_Owl.html
Bill ------------------ 72 3/4ton Custom Camper BB,400 air,ps,pb,leafsprings tilt,3.54 . 82 chevy silverado sb ,ps,pb pw,pd,air 350/350 Flowmaster 40. Torrance Calif. " If I knew I was going to live this long I would have taken better care of myself " [This message has been edited by Bill72BB (edited April 08, 2002).] [This message has been edited by Bill72BB (edited April 08, 2002).]
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BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , |
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04-08-2002, 11:07 PM
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#4 |
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14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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Take one of the rears on my truck, for example - a 275/60/15. (ignore the letters for now). 275 refers to the width of the tire in millimeters, 60 is a percentage of the tire's width and is a measure of the sidewall height (it's 60% as tall as it is wide), and 15 is the size of the rim it mounts on in inches - 15" diameter rim.
The letters you see refer to two things - speed rating and construction. The first is the only one you'll see changed most of the time; the second is R for radial and you don't see many bias-ply tires anymore, of course. Different letters stand for different speed ratings, like H, S, Z, or Y. ------------------ Project 1970 - soon to be seen at http://milhouse.treylis.org:81/
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Project1970 - LS1 Swap Complete! 
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04-08-2002, 11:08 PM
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#5 |
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14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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LOL, that's some fast responding. =) There weren't any when I started, heh....
------------------ Project 1970 - soon to be seen at http://milhouse.treylis.org:81/
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Project1970 - LS1 Swap Complete!
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04-08-2002, 11:17 PM
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#6 |
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Registered User
Join Date: Jun 2001
Location: Springfield, MO
Posts: 1,098
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Now what do the speed ratings stand for?
------------------ Nick Rodenberg Wellington, MO http://nickrod.port5.com You can click on "My 72 Chevy Truck" I have a 72 Cheyenne 10 with a V8 350 and a TH-350 auto-tranny. White/Ochre/White Runs well... working on body. Hoping to have completed in March when I turn 16
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Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!! |
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04-08-2002, 11:35 PM
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#7 |
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Progress = 0%
Join Date: Nov 2001
Location: Kansas City, MO
Posts: 2,108
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The letter stands for the speed rating.
"The tire speed rating is the maximum speed for which the tire is rated." Here's another link: http://www.tirerack.com/tires/tirete...eral/speed.htm ------------------ Current project: The "HACKstoration" 1967 GMC shortbed/fleetside, 350/700R4, air bag suspension, 18" billet wheels. Other vehicle of interest: 1957 Chevy Bel-Air 4dr hard top, 283/powerglide, lowered 3-1/2" in front and 2 inches in the rear. Web Site: jaySpot.com AOL Screen Name: Slammed67GMC Location: Kansas City, MO [This message has been edited by Slammed67 (edited April 08, 2002).]
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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra |
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07-08-2002, 12:25 AM
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#8 |
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Registered User
Join Date: Jun 2001
Location: Springfield, MO
Posts: 1,098
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What tires originally came on these trucks.. Half Ton
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Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!! |
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07-08-2002, 12:35 AM
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#9 |
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Registered User
Join Date: Jun 2001
Location: Springfield, MO
Posts: 1,098
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well what is G78-15-B Highway BB equal to. Thats whats on the glovebox door.
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Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!! |
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07-08-2002, 01:35 AM
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#10 |
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Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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i just went through all this tire crap...
flashbacks of shopping for my cam... point of information: LT tires (light truck) have 3 plys in the sidewall versus 2 ply in tires that are rated P (passenger)... thats why you can pump LT's up to like 60 pounds... LT's only come in a 85 or 75 widths though... ended up getting P255/70R16's... 
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Beat it to fit, Paint it to match... 
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07-08-2002, 11:55 AM
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#11 |
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Keepin' It Stock
Join Date: Aug 2001
Location: Grand Island, Nebraska, USA
Posts: 554
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nroden, H78-15 --
H = load rating. A was lowest rating, but I'm not sure how high they went. 78 = aspect ratio (width to heigth = 78%). 15 = rim size, in inches B and Highway BB = I haven't a clue. Maybe tread design. Anybody else know?
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72 Sierra Grande - Maych Forget about "do it right the first time". Do it wrong the first time to learn how, then do it right the second time. |
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