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Author Topic:   Olde Olde Tire Sizes to Metric Equivalent
Searcher_one
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posted April 17, 2000 02:28 PM     Click Here to See the Profile for Searcher_one   Click Here to Email Searcher_one     Edit/Delete Message Reply w/Quote
I'm rebuilding a 1979 Suzuki LJ80 2 seat 4x4. The sucker has a 797cc or 48.6 cubic inch 4 cylinder pumping out a whopping 41 hp and 45 lb/ft of torque.

Now my problem. All of this "power" is put to the ground with tires sized at:

FR78-15

Can anybody tell me what an FR78-15 would be in todays Metric sizing or how to convert???????

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Marc
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posted April 18, 2000 07:24 PM           Edit/Delete Message Reply w/Quote
Size equivalent to FR/78/R15 is:

P205/75R15.

There is no formula on that one, just specs
books!

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Searcher_one
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posted April 18, 2000 10:12 PM     Click Here to See the Profile for Searcher_one   Click Here to Email Searcher_one     Edit/Delete Message Reply w/Quote
Thanks for the info.

I spoke to a respected tire dealer here
who said I need 205/75R15's like you, and the Customer Service Rep from Michelin says to get 215/70R15's which, if I do my calculations correctly means:

215/70-15
Radius 13.4 in Diam 26.9 in Circum 84.4 in

205/75-15
Radius 13.6 in Diam 27.1 in Circum 85.2 in

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