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In this Discussion
- 51c8Joe January 2007
- BigSky January 2007
- dermott December 2006
- Hudson Dave December 2006
- jamcoats January 2007
- Kevin C. January 2007
- Uncle Josh December 2006
tire width
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hi everyone, if some one could help me here i would appriciate it. i took off my bias ply 6x16, mounted they are 6.5 inch wide. and a little tight to remove on rear of my 37 tplane coupe. the chrome reverse i got are 15 inchx6 inch wide. no tire mounted. what i would like to know is the size tire you would use, a radial 195/75/15 or 205/75/15 ???. i do not think a 70 series tire will fit and/or will rub the rear fender (too wide), i put just the rim on rear to check clearance and it is close/tight. i am thinking to find scrap tires to mount and trial fit before i lay out for new radials.
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For what it's worth, the 205-75-15 is equivalent to the old 7.10 bias. I have them on my 49.
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70 or 75 has nothing to do with width of tire. it is the aspect ratio or height of the sidewall. a 70 series sidewall is 70% of the width of the tire - the 195 or 215 in the tire description. To change the metric description of width to inches, divide the first number by 25.4. Then figure the height of the sidewall times 2 and add the wheel diameter (14, 15 or whatever) to get the overall heighth of the wheel and tire combination.
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Hi Hudson Dave here . The tire size at this point is not the whole picture . It has more to do with the wheel and the offset I just went through with my 46 Hudson . The the height and width are not the problem It Is the cross section The only thing I can say Is better safe then sorry . Buy a used one or Rent one long enough to take it home and try It on the car . As for a 195R-75=15 my books show that It has been discontinued . I do show a special tire that has a 8.0 cross section . My guess would be a 205 - 75 R- 15 . I hope this helps . call me if Ican be of any assistance 352-564-4284 HUDSON DAVE [url]www.FatWhiteWalls.com:[/url]) PS the tread width on a 75 series Is 5.1 a 70 Is 5.3
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thank you, i am going to get a scrap 205/75/15, mount on rim and try it on the coupe. i fiquire i have 6.5 inch for it to tuck inside the rear fenders. the front does not seem to be a problem, i hope, because of wheel opening. thanks again and happy new year to all. dermot.
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Hudson Dave is bringing up a good point, and to expand, 205mm tread width is not tire width, or cross section, only tread width. (Due, of course, to the balloon shape of the tire). Furthermore converting the metric tire size i.e. 205/75_R15 to inches and adding the aspect ratio's converted size to the rim will get you close, but every manufacturer's tire size is a little different. Looking at a modern tire from Goodyear for that size, the section width is 8.0, tread width is 6.6", and diameter is 27.1. An American Classic from Coker in the same metric size is 8.30" section, 5.6" tread, and 27" diameter. BFGoodrich's Silvertown Radial is 8" section, 5.80" Tread, 27.1" Diameter. So, look at the manufacturer's website and check out the technical specifications! Not all tires of a given "size" are created equal.
Digging a little deeper: To compare what you have now, A New BFG 6.00x16 is 6.25" section width, 4.63" tread with, and 28.36" OD. You want to stay as close as possible to that OD to keep your speed up, revs down, and speedo accurate. The problem here is if you don't have that much room to fool with under there, the narrowest 15" radial I can find is BFGs 185-70R15, 7.40" section, 5.50" tread, and only 25.20" OD. Even that may be too wide for you, you will just have to see, and even then, you're 3" smaller in outer diameter. You could go to a 6.70x15 or 7.00x15 bias tire (about 28" OD and 7" section) Or, to get anywhere close to the 28.36" OD in a radial, it would have to be something like a 215x75-R15-- (27.8" OD) But you're looking at almost a 9" section width!
Keep us posted on trial fitment. -
Don't want to get into an argument, but the first set of numbers in a P-Metric tire description states the section width of the tire at its widest point in millimeters. tire inflated to normal pressure not under load. Tread width is not normally stated in P-Metric tire descriptions.
A good site for tire description information can be found at http://www.yokohamatire.com/utcalc.asp -
I was mistaken, you are correct, the 205 does refer to section width, had I converted that number to inches I would have realized that. The remainder of my comments still stand, as evidenced by the .3" (8mm) difference in section width between two brands for the same "205mm width" tire. While 8mm may not sound like much, metric-size tires are usually sold in 10 mm increments, so that's almost the next size up (or down)!
Just for kicks, a metric tire the same size as that 6.00x16, but to fit a 15" rim, would be a 160x110-R15.
Useless information, but at least you know for comparison. -
I have 215/70 R16's on my '39 coupe. It's a tight fit but they don't rub against the fenders. Washing the tires/whitewalls requires turning the wheels, unless you have real skinny hands! LOL
Kevin -
One of the best sites is the Tire Rack's, for they have all the sizes etc for each brand they carry.
Hope that helps.
