Thankyou Thomas!
Now this tire stuff is making sense. Below, Thomas found a
cross reference from Michelin that lists the OD of our 5.60-14
as 628mm or 24.7". Since it is not a radial, the assumed 78%
is wrong. However, it is not 100% either or the final tire od
would be 5.6" x 100% x 2 + 14 = 25.2".
It might be nice if someone else could find another (independent)
cross reference that states the OD of a 5.60-14 non radial tire.
But if we assume that this is correct, then it becomes easier to
pick a new tire and wheel and then to know the resultant effect
on our speedometers.
So, as of now, I am assuming our stock 5.60-14 tires have (had) an
od of 24.7"
Outside Diameters of several tires and wheels:
185/60-14 is 22.7"
185/70-14 is 24.2"
195/60-14 is 23.2"
195/70-14 is 24.7" <--- Close Match
185/60-15 is 23.7"
185/70-15 is 25.2"
195/60-15 is 24.2"
195/65-15 is 25.0"
Bob Wilson
-----Original Message-----
From: Thomas [mailto:csp311@telia.com]
Sent: Monday, August 28, 2000 2:50 PM
To: bob_wilson@agilent.com
Subject: Re: 5.60 - 14 tires
I checked Michelin size conversion chart from crossply
to radial tires. They list 5.60-14 (it's not a radial tire
without the R) at 628 mm or 24.7 inches (rounded off
to 1 decimal) 5.60 inch wide is 142 mm as there were no
low profile skinny tires in the early 60's the ratio is 1:1. One
of the first 70-profile radials were Michelin XWX (remember
them?) in the late 60's. A modern radial tire is 80-profile or
78-profile unless there's a different profile included in the tire
size.
Using a modern tire on a Roadster I agree with some of the others.
You have to make a compromize between tire diameter and width.
185/60-14 or 185/65-14 will fit the Roadster perfectly with 5
to 6 inch wide wheels. You will get a lower car but it will handle
better and they will not rub on the fender lips with proper offset
wheels. The widest I have seen on a Roadster was 215/45R-17
without flares.
If you want everything 100% original, the 5.60-14 are still made.
Vintage tire suppliers recommend 165R-14 as radial replacements.
Thomas
PS. I dont want to make anyone confused.
bob_wilson@agilent.com skrev:
> Well, to you tire experts, I am still quite confused.
>
> 155/70-14 calculates to 22.54" (155mm=6.102" 6.102*0.7=4.27 4.27*2=8.54
> 8.54+14=22.54")
>
> Yet William says this should be 23.5"
> Thomas says it is 645mm or 25.39"
> Dan said he used 175/70-14 or 23.65" (and this was the best match to
> original)
> I calculated 5.60-14 to be 22.74"
> Thomas Walker suggests a 185/60-14 or 22.74"
>
> William says below that anything over 24" will hit the fender lips
>
> How about I just average all the answers and try to match that!!!
> Just kidding. I'd like to go with Thomas Walker (if that is his final
> answer) since
> the 185/60-14 seems to match the 5.60-14 perfectly but then Thomas [not
> Walker] says that I am not correct in using 78% for the 5.60-14
calculation.
> So I'm back to square 0.
>
> Still confused.
>
> Bob Wilson
>
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