[Chrysler300] FW: MX Tire specs

["Richard Barber" <c300@xxxxxxx>]

I asked Diamond Back Classics a few questions about their tires, received a
good reply and obtained permission to share it with you.  I knew speed
ratings existed for newer tires, but did not know these ratings were for a
continuous 24-hour period.  All of the tires mentioned have OD?s slightly
less than the approximately 29? on the original 8.00 X 15 Blue Streaks that
came on our 1955 C-300.

I?ve thought about tuning up our Brute for a timed speed run at Bonneville
or the Dry Lakes and have been wondering about which tire might be safe
enough in case the old Brute could still do around 130 MPH.  Technically,
I?d need an H rated tire, although I might be OK with an S or T tire.  Are
your tires rated for those occasional high speed bursts I read about here?
My old Remington's seem to hold together OK ay 80-85 MPH, but that does not
mean they are good for 24 hours, or even 24 seconds.

It seems that radial tire size of 225/75R15 is the closest match for the
8.00 x 15.  Anyone running 215's or 235's?

Below is a table I found on the internet at:
http://www.dunntire.com/Learning_Center/Tire_Speed_Ratings

It does not translate well to plain text.

An early wish for a Merry and 300'ly Christmas.

Rich Barber
Brentwood, CA
1955 Chrysler C-300

Tire speed ratings do not imply that vehicles can be safely driven at the
maximum speed for which the tire is rated, particularly under adverse road
and weather conditions, or if the vehicle has unusual characteristics. Never
operate a vehicle in an unsafe or unlawful manner.
SPEED
SYMBOL
MAXIMUM SPEED
APPLIES TO
PASSENGER CAR TIRES
APPLIES TO
LIGHT TRUCK TIRES
*
above 149 mph (240 km/h)
YES
-
Y**
186 mph (300 km/h)
YES
-
W**
168 mph (270 km/h)
YES
-
V (with service description)
149 mph (240 km/h)
YES
-
H
130 mph (210 km/h)
YES
YES
U
124 mph (200 km/h)
YES
YES
T
118 mph (190 km/h)
YES
YES
S
112 mph (180 km/h)
YES
YES
R
106 mph (170 km/h)
-
YES
Q
99 mph (160 km/h)
-
YES
P
93 mph (150 km/h)
-
YES
N
87 mph (140 km/h)
-
YES
M
81 mph (130 km/h)
YES
Temporary
Spare Tires
-

*For tires having a maximum speed capability above 149 mph (240 km/h), a
"ZR" may appear in the size designation. For tires having a maximum speed
capability above 186 mph (300 km/h), a "ZR" must appear in the size
designation. Consult the tire manufacturer for maximum speed when there is
no Service Description. Example: P275/40R17 93W at 168 mph (270km/h) or
P275/40ZR17 at above 149 mph (240 km/h). Consult tire manufacturer.

**A "ZR" may appear in the tire size designation. 
NOTE: For "V", "W", or "Y", and tires with a "ZR" rating, a vehicle load
adjustment (for speed) is required; consult tire manufacturer. 
Source: Rubber Manufacturers Association
________________________________________
From: Richard Barber [mailto:C300@xxxxxxx] 
Sent: Monday, December 07, 2009 9:56 AM
To: 'Diamond Back Classics'
Subject: RE: MX Tire specs

Richard:
 
Thank you for a thorough and prompt response.  May I have permission to
forward it to the 400+ members of the Chrysler 300 Club International, Inc.
that participate in our on-line server?
 
Rich Barber
Brentwood, CA

 

________________________________________
From: Diamond Back Classics [mailto:wwtires@xxxxxxxxxxx] 
Sent: Monday, December 07, 2009 9:49 AM
To: Richard Barber
Subject: RE: MX Tire specs
The dimensions for the MX 235/75R15 are 28.9" tall, 6.5 " tread width and a
section width of 9.3".  The speed rating is T, which is 118 mph.  (speed
ratings are the speed at which the tire can run for 24 hours without
building up excessive heat to the point of failing).  
 
Michelin doesn't make a 225/75R15 in the models we use for our MX model. 
Since we add white walls to modern radials from the major manufacturing
companies we are limited to models they sell in North America.  Michelin
does make a 225/75R15 in a light truck/SUV tire - a LTX M/S.  This model is
S speed rated (112 mph).  With  3"  whitewalls these will cost $240.00 each
plus shipping.
 
A  speed rating of U is rated for 124 mph and a H is rated at 130 mph.
 
I could not find any higher speed rating than a T for either the 225/75R15
or a 235/75R15 in any brand.
 
The Fury is S speed rated and is 28.1" tall with a 5.6" tread width and a
8.8" section width.
 
The AS4 is T speed rated and is 28.3" tall with a 6.2" tread width and a
8.8" section width.
 
The Michelin LTX M/S is 28.3" tall (supplier 's website doesn't list a tread
width) with a 9" section width.
 
Modern radials are ply rated (not actual number of plys) and the higher ply
ratings indicate the tires have a "re-enforced" bead to withstand higher
inflation rates.
 
Either the Michelin or the AS4 inflated to 44 psi could easily replace the 6
ply rated tire.  And unless you are going to be running some 24 hour
endurance races, they should also handle your speed requirements.
 
I understand you are trying to duplicate what came on the car, but modern
radials construction is so different from bias ply tires that comparing the
ratings are basically meaningless when it comes to performance.  Our
business is customizing modern radials to give them the look of the past
with the quality of performance of today for people that need safe tires to
drive on.
 
When find that reproduction tires are only safe on cars that are trailered
and seldom driven at modern highway speeds.
 
Richard
  
 -----Original Message-----
From: Richard Barber [mailto:C300@xxxxxxx]
Sent: Friday, December 04, 2009 2:12 PM
To: info@xxxxxxxxxxx
Subject: MX Tire specs
Richard:

Can you provide dimensions and speed rating for your 235/75R15 Diamond Back
MX tire?

Any reason you skipped from 215/75R15 to 235/75R15 with the MX?  It seems
the 225/75R15 size is most appropriate for old Chrysler 300?s.

Dimensions and speed rating for Fury 225/75R15 and AS4  225/75R15 also
requested.

I?m looking for a 129 MPH tire, roughly equivalent to the 8.00 x 15 Goodyear
6-ply nylon Blue Streaks that came on our 1955 Chrysler C-300.  Original WSW
width 3?.

Thanks for any light you can shed.

Rich Barber
Membership Manager
Chrysler 300 Club, Inc.
1801 Redwine Terrace
Brentwood, CA 94513-6000
Home:  925-513-6583
Cell:  925-783-4893
 
  




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