ivantruckman Posted February 20, 2007 Share Posted February 20, 2007 when you guys refer to 28 s 29s , are you refering to the outside diameter, i know the width and rim size ..ie 15 x 6..thats the only thing i can thing of...thanks... Quote Link to comment Share on other sites More sharing options...
Reveeen Posted February 20, 2007 Share Posted February 20, 2007 I *think* they are refering to height, as in placing the end of a tape measure on the ground and measuring up to the top of the tire. Quote Link to comment Share on other sites More sharing options...
mikeshoup Posted February 20, 2007 Share Posted February 20, 2007 When people say they run 29s, that means the tire's outside diameter is 29 inches. Stock tires, btw, are roughly 23 inches. By running 29 inch tires, you actually gain ~ 3 inches in ground clearance (half of the difference in diameter, or, the difference in radii) Quote Link to comment Share on other sites More sharing options...
ivantruckman Posted February 20, 2007 Author Share Posted February 20, 2007 thats what i thaught, thanks again shoupeman... Quote Link to comment Share on other sites More sharing options...
daeron Posted February 20, 2007 Share Posted February 20, 2007 FYI FWIW if you look at the spec chart for any tire on tirerack.com, it will tell you the outside diameter of that tire, as well Quote Link to comment Share on other sites More sharing options...
ivantruckman Posted February 20, 2007 Author Share Posted February 20, 2007 some guys say 28s will fit in stock wheel wells ? ill have to see that Quote Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted February 20, 2007 Share Posted February 20, 2007 some guys say 28s will fit in stock wheel wells ?ill have to see that Well... Me Too! Also, Why Don´t you Refer to the Size as is Detailed in the Tyre? For Example, I have 205/60 R-13 on my Yellow Wagon, and 195/65 R-13 on my White Wagon. The numbers Means: (as Far as I Know) 205= the size from one Side to the Other Side, startin´ to Measure from edge to Edge (Where Tyre touches the Rim) 60= is the Amount in % taken from that Cypher (205) to make the Tyre´s Walls. In this case, is 60% of the 205. R= Rim (Some Brands Add: "S" or "Z" Before the R, meanin´ sometimes "S" = Sport, and "Z" = High Speed. 13= You Know... ... 13" So, the Question is: Why you say 29, 28.5, etc, instead of... 205/70 ZR-14 for Example? Quote Link to comment Share on other sites More sharing options...
mikeshoup Posted February 20, 2007 Share Posted February 20, 2007 So, the Question is: Why you say 29, 28.5, etc, instead of... 205/70 ZR-14 for Example? Its referred to by both. In offroading, people often care more about the tire diameter than the actual tire width and sidewall aspect. In non-offroading contexts, you usually see the tire size: 185/70/13 In offroading contexts, you usually see the diameter: 23.2" Quote Link to comment Share on other sites More sharing options...
Hodaka Rider Posted February 20, 2007 Share Posted February 20, 2007 Because the LT (light truck) tires that many people are using for these applications are marked in inches on the sidewall. It's an American thing, I guess. Americans (civilians, anyways) are some of the last people in the world to hold onto measuring things in inches, feet, miles, etc. Most other countries have switched to the metric system long ago, thus most tires are marked using metric measurements. Interesting enough, though: the wheel (or rim, as some people call it) is still measured in inches in most countries. Weird. Quote Link to comment Share on other sites More sharing options...
mikeshoup Posted February 20, 2007 Share Posted February 20, 2007 Because the LT (light truck) tires that many people are using for these applications are marked in inches on the sidewall. I don't think I've ever seen a tire with the outside diameter marked on the sidewall. The LT tires are marked with the tread width in inches. Not the diameter. Quote Link to comment Share on other sites More sharing options...
Hodaka Rider Posted February 20, 2007 Share Posted February 20, 2007 Possible, I guess my point to him was just that that's how many of these tires are marked, whether it's on the tire, or just on a piece of paper. Wait, do you mean they just say "9.50/15" or something like that on the sidewall of, say, a swamper SSR? Quote Link to comment Share on other sites More sharing options...
mikeshoup Posted February 20, 2007 Share Posted February 20, 2007 Wait, do you mean they just say "9.50/15" or something like that on the sidewall of, say, a swamper SSR? I don't know. Never seen offroad tires I guess Quote Link to comment Share on other sites More sharing options...
Hodaka Rider Posted February 20, 2007 Share Posted February 20, 2007 Well, hopefully I'll find out soon. Just placed my order for 27/9.50/15 SSR's. Quote Link to comment Share on other sites More sharing options...
Reveeen Posted February 20, 2007 Share Posted February 20, 2007 And on the other hand.........I just ordered up some 215/85/16's 10ply lugs with a 30.39" diameter. Quote Link to comment Share on other sites More sharing options...
Phizinza Posted February 21, 2007 Share Posted February 21, 2007 Just remember, a 29x9.5R15 isn't always 29" tall, or even 9.5" wide.. Example: Kumho Venture M/T 27x8.5R14's are 26.3" tall, and 7.75" wide. So go figure. Quote Link to comment Share on other sites More sharing options...
RavenTBK Posted February 21, 2007 Share Posted February 21, 2007 R= Rim Psst. R = Radial. Bias ply tyres lack the R in the designation. For a long time I thought it meant rim as well, however learned that isnt the case. Quote Link to comment Share on other sites More sharing options...
subie_newbie Posted February 21, 2007 Share Posted February 21, 2007 American passenger or onroad tires are marked in metric, i.e. 215/75/15 American off-road tires are marked in inches, i.e. 31x7.5x15 (that's 31" high, 7.5" wide, 15" rim) Interco Swampers and Boggers are the only tires that are true to their measurements, AFAIK. Quote Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted February 22, 2007 Share Posted February 22, 2007 Thank you for your Responses! ... It's an American thing, I guess. Americans (civilians, anyways) are some of the last people in the world to hold onto measuring things in inches, feet, miles, etc. ... Not only in U.S.A. People use Inches, feet, etc... We in Honduras use Both Measurement Systems in Some Cases... Distance is in Kilometers, Fuel in Gallons, etc... Such a Confusin´ Custom, isn´t it? Quote Link to comment Share on other sites More sharing options...
daeron Posted February 22, 2007 Share Posted February 22, 2007 Distance is in Kilometers, Fuel in Gallons, etc... Such a Confusin´ Custom, isn´t it? Kilometers per gallon??? Raise your hand if you are an american, ashamed by the intellectual laziness of your country, AND embarrassed by the fact that the rest of the world patiently waits for us to come around! *raises*hand* Quote Link to comment Share on other sites More sharing options...
RavenTBK Posted February 23, 2007 Share Posted February 23, 2007 Raise your hand if you are an american, ashamed by the intellectual laziness of your country, AND embarrassed by the fact that the rest of the world patiently waits for us to come around! +1 Quote Link to comment Share on other sites More sharing options...
baccaruda Posted February 23, 2007 Share Posted February 23, 2007 http://www.miata.net/garage/tirecalc.html Quote Link to comment Share on other sites More sharing options...
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