Per historic data equivalence, H78-15 (previous 8.45-15 or
7.60-15) crosses to HR78-15, H70-15, HR70-15, P225/75R15,
P235/70R15, P255/60R15. Each successive generation reduced overall
diameter and radials have lower section height (Static Loaded
Radius) for given diameter.
7.60-15 - 28.7-29.0 OD (Manufacturers Specs - OD varies by Manufacturer) Loaded Radius 13.3-13.5 in
8.45-15 (later 8.55-15) - 28.4-28.7 OD, Loaded Radius 12.96-12.99 in
215R14 (early Michelin Radial) 28.4 OD, Loaded Radius 12.6 in
H78-15 28.2-28.4 OD, Loaded Radius 13.1 in
HR78-15 (Michelin data only) 28.2 OD, Loaded Radius 12.4 in
H70-15 28.4 OD, Loaded Radius 13.1-13.2 Loaded Radius
HR70-15 (Michelin only) 28.2 OD, 12.4 Loaded Radius
P225/75R15 28.2-28.4 OD (Cooper Trendsetter 28.05 OD) 12.4-12.7 Loaded Radius (limited current data)
P235/70R15 27.8-28.0 OD, Loaded Radius Data Not Available
So expect car to sit about an inch lower with current tires
FYI next size up is P235/75R15 which is much more common due to its use on pickup trucks well after cars moved away from 15 inch tires
P235/75R15 28.9-29.0 OD, Loaded Radius 12.7-12.9 in and still
available in production (read cost effective) narrow whitewalls
from Hankook, Toyo, Nexen, and Cooper last I checked.
--Hi Joe,Looks like Kelsey’s Goodyear Polyglas Tires is the only current source and, as you mention, H70-15 classic RWL (raised white letter) tires aren’t in their offerings. I’ve attached a few links here for the classic G70-15, and a link for the classic L60-15 bias ply tires. Don’t see any radials listed having the classic RWL appearance.
Comparing the specs of the G70 and L60 -Diameter 26.8” vs 28.07”Tread width 8.40” vs 9.00”Section width 9.76” vs 12.12”Load 1620# vs 1970#H70-15 tires are listed as 28.1” diameter, so they approximate the meatier L60-15’s diameter.Though they’ll have L60 instead of a G70 lettering, the L60 tire height will look the correct height. Question is, does your Hurst have the inside and outside clearance for these 60-series tires that are about 2.3” wider that your current H70s? Also scope this out with your front wheels turned all the way left and right.
Have you reached out to our Club’s Hurst consultant, Karl Pippart III? - karl@xxxxxxxxx.
Good luck, and let us know if you find a better solution!Noelhttps://www.jegs.com/i/Kelsey-Tire/618/CB4W1/10002/-1
--
Sent from my iPhone
On Mar 28, 2021, at 11:18 AM, highoctane300h via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
--Hi all…
I’m in desperate need of new tires for my 70’ Hurst, the original tires are of an add size H70-15 no longer made, any suggestions Bias or Radial must be GoodYear’s, trying to maintain originality as much as possible,
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