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May 26, 2009 10:27:55 GMT
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I'm familiar with the usual 195/50R15 stuff... that's easy. It's other sizes that bewilder me. Crossplies seem to have different numbers. As do race and drag tyres. And I have no clue what they mean. Can anyone please explain? Thanks.
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May 26, 2009 10:50:50 GMT
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I found this pretty helpful when looking into some tall crossplies for my Zephyr. It starts off basic but has some clear explanations and even a Imperial to modern tyre size 'estimator'. www.carbibles.com/tyre_bible.html
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May 26, 2009 10:51:28 GMT
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Along with the type of measurement you showed above (width; % profile; wheel dia) the other size I use a lot is the American style of measurement.
An example would be 31/10.5/15 where the total diameter of the tyre (height) is 31" inches, the width of the tread is 10.5" and the wheel diameter is 15"
My Delica runs on 33/12.5/15's which you can probably gather is 33" tall tyres, 12.5" wide tread and to fit 15" alloys.
Hope that makes some sense??
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May 26, 2009 11:07:19 GMT
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Just the info I was looking for! Thanks guys. It was the American sizes that first got me scratching my head, then I looked at crossplies and found they were different again! It seems then that a lot of racing tyres use American measurements, particularly stuff like Hoosier (I would imagine that's because they're a U.S. company... ) Great stuff, thanks a lot!
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,537
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May 26, 2009 11:23:48 GMT
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Follow your dreams or you might as well be a vegetable.
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May 26, 2009 11:27:04 GMT
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The american scheme is quite easy to use because you know the actual diameter of the tyre from the outset rather than having to use a tyre calculator to work it all out. If you ever want to cross reference the conventional tyre sizes against the American system, then use this calculator - it has the American sizes under 'additional sizes' and you can directly compare with the more common sizes (up to 5 sizes at a time): www.1010tires.com/TireSizeCalculator.aspHope that helps?
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May 26, 2009 11:46:00 GMT
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Fantastic! Maybe this could go into the "Useful threads" bit? Unless I'm just a thicky and everyone else gets it... ;D Perhaps it's a bit off proposing my own thread goes into the useful threads archive but you people have come up with some really handy links and info.
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May 26, 2009 20:11:15 GMT
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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MartinC
Part of things
Don't like stretched tyres, very low profile tyres & I think a car CAN be too low. Perhaps I'm odd.
Posts: 935
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May 27, 2009 14:43:01 GMT
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Crossplies sizes are both width and height of sidewall (not tread). So, a 750x16 is for a 16 inch rim, is 7.5 inches in width when fitted and the sidewall height is 7.5 inch too. i.e. an aspect ratio of 100%.
Low profile crossplies did come in the '60s and usually had the letter 'S' in the size. i.e. 620Sx13 fits a 13 inch rim, is 6.2 inches wide but the sidewall is NOT 6.2 inch tall, but is less. No idea what the ratio of these is though. I'm guessing at 80% like radials. Anyone know?
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1937 Standard Flying Twelve
1943 Bedford OYD
1947 Cadillac Fleetwood Sixty-Special
1954 Hillman Minx MkVIII
1956 Austin A30
1957 Vauxhall Victor Super
2001 Chrysler 300M
2002 Rover 75 Connoisseur SE Tourer
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