Re: {Chrysler 300} Tire recommendations for 300F

[EM-ATC-2021 <millserat@xxxxxxxxxxxxx>]

CAUTION - The original (1967) Radial size 235R14 is NOT the same as 
current 235/75R14

Bottom Line you have 3 choices - American Classic P235/75R14, Coker BF 
Goodrich vintage 9.00-14 Bias reproduction tires, or I believe 
Diamondback may have something in their new Auburn Premium line in 
HR78-14 with a 27.5 in OD and looking a lot like the Michelin XWW of the 
70-80 time frame - which may be a decent alternative

Going back in my Wayback Machine,

9.00-14 became 8.85-14 and later was replaced by J78-14. The equivalent 
1967 radials - 80 series (or maybe 83 series?)  would have been a 225R14.

9.50-14 would have translated to 235R14 - though the 235R14 would 
probably have been closer to the same ride height as the 9.00-14 as the 
radials were slightly lower profile (wider but shorter diameter) and 
they sat lower for a given tire diameter because of their construction.

The 225R14 was then replaced by the 235/75R14 or P235/75R14 with a 
further decrease in profile. However this was (is) the largest size 
(diameter) passenger tire actually produced. (And as an aside it is not 
clear that any of the 1967-70 vintage radials were ever produced in 
sizes larger than 225R14)

Now for the dimensions - and lets be clear there are 2 critical factors:

Overall Diameter as it affects revolutions per mile and hence 
speedometer / odometer readings

Static Loaded Radius (dimension from ground to center of wheel) as it 
affects ride height (possibly ground clearance) and visual image. And 
yes this is tied back indirectly to overall diameter, but recall radials 
sit lower for a given diameter than old bias ply tires did.

I happen to have data sheets from 1959-61 for BF Goodrich, Firestone, 
and General OE tires (sorry no Goodyear). I also have 1971 General Data, 
1979 and 1985 Michelin data, and current Coker data. Unfortunately, the 
1971-85 data only goes up to the 8.50-14 equivalents (8.55-14, H78-14, 
P225/75R14) as no larger tires were in regular production - so I have 
included the 8.50-14 size progression for reference.

9.00-14 (1959-61 vintage) BFG 28.8 in OD Static Loaded Radius (SLR) 
13.26 in, Firestone 29.0 / 13.2, General 28.8 / 13.4)

8.85-14 (General 1971) 28.3 in OD, 12.99 in SLR

So by 1971 we've already dropped car 0.4 in (0.5 if comparing General 
1959 to General 1971), and our speedometer is 2% higher than actual 
speed (assuming it was accurate to start)

9.00-14 Coker BF Goodrich Deluxe Silvertown 28.68 in OD - No SLR data

P235/75R14 American Classic 27.87 in OD - No SLR data

So here we have a 3.3% Speedometer error and probably close to an inch 
loss in ride height and that may be as good as you can find short of the 
bias repros (good for show but not recommended for driving).

8.50-14 (1959-61 data as above) 28.3/28.4 in OD, 13.0/13.1 in SLR

8.55-14 (1967 Goodyear, 1971 General) 28.2/28.3 in OD, 12.8/12.9 in SLR

H78-14 (1971 General) 27.85 in OD, 12.8 in SLR

215R14 (1979 Michelin) 27.4 in OD, 12.2 in SLR

HR78-14 (1979 Michelin) 27.5 in OD, 12.0 in SLR

P225/75R14 (1985 Michelin) 27.6 in OD, 12.1 in SLR

P225/75R14 Cooper Trendsetter SE (Discontinued 2006) 27.05 in OD, No SLR 
Data

P235/70R14 (1986 Firestone) 26.66 in OD, 11.5 in SLR

So if you are looking at 8.50-14 to equivalent P225/75R14, you have gone 
from 28.3 in OD, 13.0 in SLR to 27.6 in OD, 12.1 in SLR (Michelin 1985) 
2.5% Speedo error and nearly an inch lower car height - or worse to 
27.05 in OD (Cooper 2006) 4.6% error.

Or if you make the mistake of thinking P235/70R14 is better than 
P225/75R14 (neither of which are currently made but thats a different 
story) you have gone from 28.3 in OD / 13.0 in SLR to 26.66 in OD / 11.5 
in SLR or 6.1% error and 1.5 in reduced ride height.


On 5/22/2021 7:46 PM, 'Keith Langendorfer' via Chrysler 300 Club 
International wrote:
> Folks
>
> I know this question comes up pretty frequently but I’ve lost track of the answers.
>
> What wide white radial do you recommend for the 9.00x14 for the F? I think it equates with a 225R14. I’m leery of Cokers for several reasons. The Toyo wide white radials work great on my ‘56 Golden Hawk but I’m not sure they are available anymore
>
> Thanks in advance
>
> Keith

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