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Dream38v8
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-- 12-14-2020 @ 12:26 PM
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Reading the note on radial tire size got me thinking about my tires. I will be replacing tires on my '38 Deluxe fordor in the spring. I have decided to go with basis ply vs. radial. Additionally I am seriously considering Lester tires or Diamond Back. Lester Tires were on the car when I purchased it in 2016 and there have been no issues. My logic behind my decision is based on cost and miles driven per year (1000+) for the last five years. Very little driving is at highway speeds even though the '38 has no issue getting to 60. I was looking to go one size larger at 6.50x16 vs. 6.00x16. To my knowledge the wheels could be original. So is there any issue with moving up to 6.50x16?
Thanks
Ray
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sarahcecelia
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-- 12-14-2020 @ 1:15 PM
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They are only 50/100 ths. wider; that's not much
Regards, Steve Lee
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TomO
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-- 12-15-2020 @ 6:38 AM
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They should fit your car OK. You will have some speedometer error and slow speed turning issues that could be significant to some people. When I went to the larger size, I went from Lester tires to Firestone and did not notice any change in steering effort.
Tom
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Steve Kennedy
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-- 12-16-2020 @ 7:26 AM
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I have 6.50x16s on the back of my '36. I also have an ap that grand son downloaded on my phone which shows my exact speed. At 60 on my phone, I am actually going just a little faster, like 63. Speedometer bounces around some times so it is hard to tell.
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sarahcecelia
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-- 12-22-2020 @ 1:47 PM
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Tire width has no effect on the speedo. That only comes into play when you change the diameter.
Regards, Steve Lee
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ford38v8
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-- 12-23-2020 @ 12:23 AM
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With regard to previous contradictory posts regarding speedometer error, the following facts are presented for those who value documentation over opinion.
From the Ford V8 Service Bulletins:
6.00 x 16 tire
Approximate loaded rolling radius: 13.38"
Approximate revolutions per mile: 740
6.50 x 16 tire
Approximate loaded rolling radius: 13.60"
Approximate revolutions per mile: 722
Alan
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sarahcecelia
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-- 12-27-2020 @ 2:30 PM
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That may be true, but that's not going to be very noticeable on the speedometer!
That's only 18 revolutions per mile ! The speedometer might be off a half of a NEEDLE WIDTH!!
Regards, Steve Lee
This message was edited by sarahcecelia on 12-27-20 @ 2:34 PM
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ford38v8
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-- 12-27-2020 @ 3:43 PM
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Again, that's only your opinion. Do the math.
Alan
This message was edited by ford38v8 on 12-27-20 @ 3:44 PM
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kubes40
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-- 12-27-2020 @ 4:51 PM
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Alan, you are of course 100% correct in your previous post.
I install 6:50's on all of my restorations. They were an optional size in '39 as well as '40. In my opinion, they simply look so much better than the (too) small 600's.
The difference between the two in real numbers?
The 6:50 is 29.1" tall, while the 6:00 is 28.3" tall.
The 6:50 has a tread width of 5.1" while the 6:00 has tread width of 4.13".
Realistically, my restorations rarely, if ever, get driven so I can't comment on how far off the speedometer is with this larger tire.
However, I'd also installed 6;50's on my '36 roadster (my "driver") and have found the speedometer off by approximately 3 MPH when running at 55 + /- mph.
So yes, as you'd stated previously, it does make a difference.
Mike "Kube" Kubarth
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ford38v8
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-- 12-27-2020 @ 5:28 PM
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Mike, Several people including yourself have noted an approximate 3 mph difference. You have furnished diameters of the two sizes, and Ford published loaded radius figures. I'm wondering then, am I not doing the math correctly, as I come up with a 1.5 mph difference? I'm thinking that loaded radius must be a static measurement, while the rolling dimension would be closer to the actual. Who knows? Maybe Ford didn't do the math correctly! 
Alan
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kubes40
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-- 12-28-2020 @ 6:06 AM
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Alan, I can't say for certain as the 3 mph I'd observed is only a comparison of my speedometer to my wife's phone ap.
Mike "Kube" Kubarth
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Dream38v8
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-- 03-08-2021 @ 2:58 PM
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Great dialogue on 6.00 vs. 6.50. I'm going to go with the 6.50x16. Now to brand. Lester, Diamondback, Coker, etc. I would appreciate a recommendation as to brand. I am going with bias ply and wide whitewalls. I drive approx. 1000 miles a year and stay under 55mph. Hence my bias ply decision. The current tires could be 19 years old as the car had a frame off in 2002.
Thanks everyone!
Ray
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sarahcecelia
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-- 03-08-2021 @ 6:05 PM
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That's not my opinion; That standard math; 18 more revolutions in a mile? That's NOTHING!! If you figure it out mathmaticly, that's approximately 63 feet more in one mile!!! (C x 18= ?) Most people don't even know what size 6.70-15 means. It means 6.70 hundedths of an inch of tread width, x 15 inch rim diameter. I've worked on cars professionally, and in my private life for 66 years, before a lot of people were thought of, or even born.
Regards, Steve Lee
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LarryK
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-- 03-10-2021 @ 5:03 AM
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I have Lester tires on my 1939 Deluxe Tudor. They have given good service (10,000 miles, 6.00-16 bias ply blackwall). Made in the USA.
Using the Ford Service Bulletin data provided by Alan on loaded rolling radius, the ratio is 1.016. The speedometer error would be only 1.6%. 60 mph on the 6.00-16 tires would read 59 mph if the tires were switched to 6.50-16.
Larry
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zeke3
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-- 03-10-2021 @ 6:28 AM
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The speedometer gear chart in the "Green Bible" page 634 calls out the same 19 tooth speedometer gear for both 6.00 x 16 and 6.50 x 16 4 ply tires used with the 3.78 rear axle ratio, so the difference in indicated speed between the two tire sizes must have been acceptable to Ford Engineering.
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Steve Kennedy
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-- 03-10-2021 @ 10:08 AM
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Just watch your tire diameter and make sure whatever is on the front will clear the fenders. I know you said you are going with bias, but for everyone elses info, Coker's 6.50 x 16 radials do not clear the front fenders on a '36.
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Dream38v8
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-- 03-11-2021 @ 12:51 PM
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Steve, you raised an interesting question regarding clearing the fender. I'll go out an check the clearance on my 6x16 bias.
This was an enjoyable string regarding the difference in diameter between the 6 and 6.5x16 tires. No one discussed the pros and cons of the various tire brands (Lester, Diamondback (Auburn Deluxe or Federal Formoza), Coker and Universal). I was looking for some information on experiences with the various brands. Now currently leaning towards Diamondback Auburn Deluxe.
Ray
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TomO
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-- 03-12-2021 @ 7:44 AM
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Ray, I hope you realize that the Diamond Back tires are radial tires. If you are going to get white wall tires, the process is to grind some of the rubber from the sidewall and then use a vulcanizing glue to attach the white wall.
If you want bias ply tires, there really isn't much difference in the tire brands made in the USA. Coker makes most of the bias ply tires sold in the USA. I have had my Firestone tires since 2012 and have not had any problems with them. Others have had problems and when Corky Coker ran the company, the problems were resolved quickly. I intend to buy another set next year.
Tom
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Dream38v8
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-- 04-23-2021 @ 5:22 AM
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First I want to thank everyone's responses to my tire question. I decided to go with Diamondback radials. I am not sure as to the age of the Lester tires. I know the previous owner never bought tires. Hence these tires maybe dated back to 2002. I've had a chance to put less than 100 miles on the tires so far. What a great difference. It could be the fact that these tires are new compared to the Lester tires. The ride is smoother and straighter plus less movement is the steering wheel. Only one issue arose during installation. One wheel would not hold air and therefore radial tubes were added. BTW I decided to go with the original tire size of 16x6.
Ray
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wmsteed
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-- 04-27-2021 @ 10:21 AM
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A lot of very good technical info on tire size contained in the many contributions to this topic, I will now add some real life experiences with oversize tires on OEM stock wheels.
During the '40's/'50's my father had many 1/2 ton pickups, Chevy and Ford. Dad would always buy the truck's with 650x 16 tires in lieu of the stock 600 x 16. On many occasions dad experienced failures to the rim, spitting at the bead with the oversize tires. I was with my father on at least two occasions when the rim split causing the tire to bulge out and the rim edge to hit the fender. Quite a mess.
After WWII ended Dad would upgrade the wheels to HD artillery style with the 650 tires and/or 700 x 15.
In the late '40's the manufactures started to use wider heavier rims, which minimized the rims cracking.
Bill
36 5 win delx cpe
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