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What is the diameter of the 6.00-14-6PRLT OE tire?


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CANNOT find any specs for the 6.00-14 tire (specifically 6.00-14-6PRLT I'm guessing this is a Japanese tire size)

 

I found one google answer that said 26.5 but that is too large:  I run 205/75r14's that are 26.1 and they are too tall for the speedometer calibration.

 

Coker tire doesn't even show a 6.00.  For the 5.90 they say some nonsense about 185/70r14 (24.2" dia) which is stupid small.

NOTE:  I'm going to email Coker and see if they have any proper specs.

 

WTF

 

I believe someone said 195/75r14's was just about right.

 

Two other options are the 185r14 and 195r14 which have diameters of 25.7 and 26.2" respectively.

 

NOTE:  Here is the only reference to the 6.00-14-6PRLT which is google hit but the link does not work:  The Delica is a Mitsubishi mini van but searches on it only go back to 1989 which isn't old enough.

*6.00-14-6PRLT. Steel type. 5-Jx14. Wheel type. Wheel size. Steel type ... means 6.00-14-6PRLT tires are installed on POZWSZUL front and rear wheels,.
Edited by Cardinal Grammeter
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6:00 x 14 is a 50s/60s era tire measurement. My '64 Dodge (car) was 7:75 x 14. I too am confused and found 23-24" but I think it's really 26 or more.

 

https://www.tirerack.com/tires/tiretech/45_conversionchart.jsp

 

6:00 x 14 is supposed to convert to 185/65R14 and it is 23.5" diameter.

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My dad bought a brand new 1973 620, which I still have. I don't know what tire size the original compared to, but the 185R 75 x 14  is the size my dad put on the 620. I also have a 195R 75 x 14 here (not sure if it is dad's or my brothers). I'm wondering how accurate Datsun's speedometers are as I've heard that both sizes of tires can be accurate. It's dark outside now so I don't want to go out there now. If you need pics I can get that in the morning.

 

Don

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15 hours ago, 620slodat said:

My dad bought a brand new 1973 620, which I still have. I don't know what tire size the original compared to, but the 185R 75 x 14  is the size my dad put on the 620. I also have a 195R 75 x 14 here (not sure if it is dad's or my brothers). I'm wondering how accurate Datsun's speedometers are as I've heard that both sizes of tires can be accurate. It's dark outside now so I don't want to go out there now. If you need pics I can get that in the morning.

 

Don

 

Yes, it seems the consensus is 185 or 195 75 series 14's.   24.9 vs 25.5 respectively  (205 IS 26.1)

 

Tiresize.com lists tires by diameter however they do not support the 185r14 195r14 sizes w/o aspect ratio specified.

 

https://tiresize.com/tiresizes/

 

Unfortunately, the Speedometer is not the way to assess tire size diameter correctness - the Odometer is the one since it is connected by gears to the rear axles.  If the odometer is off, then you have to insert a small gearbox at the speedometer cable to make the correction.

 

The Speedometer is calibrated.  PA State Police had "Calibrated" speedometers - they were done at speedometer shop in Youngwood, PA.  Stewart's or Stuart's - I don't remember.

 

Your odometer can be spot on, but your speedometer can be high or low depending on how it's calibrated.  That would explain why either the 185 or 195 can be more accurate.

 

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Someone, in the last couple of months posted a picture of a 6:00 X14 truck tire with tape measure and IIRC it was 26" and change. At the time I said this did not agree with the tire size conversion chart I had. I'm more likely to believe the tape measure.

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1 hour ago, datzenmike said:

Someone, in the last couple of months posted a picture of a 6:00 X14 truck tire with tape measure and IIRC it was 26" and change. At the time I said this did not agree with the tire size conversion chart I had. I'm more likely to believe the tape measure.

 

That Tire Size Conversion Chart has some real weird instructions on how to use (basically meaning it's useless).  Here are the instructions that are at the bottom in small print:

 

* When replacing Alpha Numeric tires with Euro-metric or P-metric tires, look for the Euro-metric or P-metric size listed in the equivalent aspect ratio. For example, when replacing a FR78-14, you would look up the appropriate 75-series size, the 205/75R14. If replacing a FR70-14, you would look up the appropriate 70-series size, the 215/70R14. If replacing a FR60-14, you would look up the appropriate 60-series size, the 235/60R14.

 

  • Listing in chart does not imply complete interchangeability.
  • When changing tire sizes, dimensional clearances must be checked.

It appears the 185r14 no aspect ratio designation is allegedly an 82 series tire or simply an 80 series.  There are current 80-series tires available at this time.

 

I used to calibrate taxi meters for Jeannette Taxi  and there was a mile marked off near by.  They were forced out of business  due to PUC rejecting bids for areas "because you are not a large enough concern" the markings are probably obliterated.

 

It would be nice if other members might have an opportunity to check their odometers over the measured mile and their tire size and tread depth.  Also would be interesting to see how well the speedometers are calibrated to the odometers.

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WooHoo, did a search on "6.00-14 truck tire" and found this Chinese site with a complete table of bias ply tires:   (Is the OE 6.00-14-6PRLT a radial tire?  ANSWER:  NO:  the PR is actually 6PR or "6 Ply Rating"  and LT is "Light Truck")

OE tires are bias ply according to FSM which also shows everything in RH drive.  

 

So did 620's actually come with 6.00-14 tires bias ply tires in the USA since the speedometer calibrations suggest radials?

 

https://runwelltyre.en.made-in-china.com/product/LBOQkwVJXzcT/China-Bias-Truck-Tyres-6-00-14-6-00-15-6-50X14.html

 

Hell-uv-a truck tires for $20-30 each (8 ply) but looks like a 20' container min order.

 

The 600-14 OD is 680mm which is 26.77" diameter.

 

However my 26.11" 205/75r14's are too big according to speedometer (error is something like maybe going 3mph faster than speedometer says using GPS) - but I haven't checked my odometer - EUREKA - can use GPS Trip setting to check Odometer accuracy.  

Nasty winter storm here.  We should be able to get a lot of measurements use GPS since so easy.  Hardest part is reading size off of tire.

 

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Bias Truck Tyres 6.00-14 6.00-15 6.50X14 pictures & photos
 
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Bias Truck Tyres 6.00-14 6.00-15 6.50X14

Reference FOB Price
US $20-30 / X20′GP | 1 X20′GP (Min. Order)
 
 
Diameter: 11′′- 15′′
Tire Design: Bias Belted Tyre
Certification: ECE, ISO9001, DOT
Tread Pattern: Highway Tread Pattern
Tire Hierarchy: 10PR
Cord Material: Nylon
 
Customization:
Available
|Customized Request
 

Contact Supplier

 Gold Member Since 2011
 Audited Supplier
Manufacturer/Factory
 

Basic Info.

Model NO.
600-14, 600-15,
Inner Tube
Inner Tube
Customized
Non-Customized
Condition
New
6.00-14
Rib
Transport Package
According to Customer′s Request
Specification
EXPORT
Trademark
RUNWELL
Origin
China
HS Code
4011200011
Production Capacity
300*40′hq/Month

Product Description

High Quality Bias Light Truck Tires.

Specification:
6.00-14-8PR / 10PR
6.00-15-8PR / 10PR
Bias Truck Tyres 6.00-14 6.00-15 6.50X14

Pattern: RIB

Brand: RUNWELL

Minimum order quantity: 1x20' feet container (several sizes in one container is ok )

Delivery time: Within 20 days after order confirmed.
Tyresize Standard rim Inflated size of new tyre(mm) Max load(kg) Standard pressure(kpa)
OD SW    Dual/Single
9.00-16-14PR 6.50H 890 255 1720/1955 630
8.25-16-16PR 6.50H 855 235 1600/1800 730
8.25-16-14PR 6.50H 855 235 1500/1700 630
7.50-16-16PR 6.00G 805 215 1395/1580 770
7.50-16-14PR 6.00G 805 215 1320/1500 730
7.50-16-12PR 6.00G 805 215 1250/1400 630
7.50-15-14PR 6.00G 780 215 1320/1480 730
7.50-15-12PR 6.00G 780 215 1215/1360 630
7.00-16-14PR 5.50F 775 200 1180/1320 730
7.00-16-12PR 5.50F 775 200 1075/1220 630
7.00-15-12PR 5.50F 750 200 1030/1150 630
7.00-15-10PR 5.50F 750 200 915/1040 530
6.50-16-12PR 5.50F 750 185 925/1060 630
6.50-16-10PR 5.50F 750 185 875/975 530
6.50-15-8PR 4.50E 730 180 730/825 420
6.50-14-8PR 4 1/2J 705 180 690/775 420
6.00-15-8PR 4.50E 705 170 630/720 420
6.00-14-8PR 4 1/2J 680 170 600/685 420
6.00-13-8PR 4 1/2J 655 170 570/655 420
5.60-13-8PR 4J 600 160 565 420
5.50-13-8PR 4J 620 160 500/565 420
5.00-12-8PR 3.50B 568 143 465/485 400
5.00-10-8PR 3.50B 517 143 410/430 400
4.50-12-8PR      3.00B 545 127 395/415 400
Edited by Cardinal Grammeter
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More explanations from Mecum"

 

"From the 1930s onward, American cars gradually transitioned into smaller wheel diameters, while increasing tire and wheel width. Any tire size that ends with a zero, such as 6.70-15 or 7.10-15, featured an approximately 90% aspect ratio. Any bias-ply tire ending in the number five, such as 6.95-14, 7.75-15, etc., featured an 80% to 84% aspect ratio. We continue to use numeric sizing in most of our bias-ply tires, as well as our bias-look radials. For radial tires, we simply add the letter “R” in place of the hyphen (ex. 6.70R15)."

 

So the 6.00 is 152mm call it 155 and @ 90%, a 155/90r14 diameter is 24.98 inches.  (of course the Aspect Ratios are approximate for stuff that old.)

 

Would be nice if someone had an actually 6.00-14 off a 620....  But it sounds like 6.00-14's could vary all over the place I'd bet.  

 

Would like to find that pic of the guy measuring a 6.00-14

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I'm late to the party but hopefully this helps. I kept thinking I still had an original tire as a spare on my 620 so went looking, when I pulled it I remembered having them recapped.

It's been under there a good while.

 

20220120_155938-III.jpg

 

Rollout measured with a stagger tape

20220120_173718-III.jpg

 

Pushed it against the garage door and measured

20220120_173948-III.jpg

 

Size shown and under the dust it says 6 ply

20220120_174005-III.jpg

Edited by Ooph!
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Most Awesome!  You were saving The Best for last!

 

80/3.14 = 25.47

 

Assuming about .125" tread wear, 25.47 + .25 = 25.97 

 

Copying tire diameters from previous post in this thread:  "...  it seems the consensus is 185 or 195 75 series 14's.   24.9 vs 25.5 respectively  (205 IS 26.1)"

 

So it looks like the 205 @ 26.1 is .1" tall and the 195 @ 25.5 is .5" short.

 

I wonder what the speedometer/odometer accuracy was with the 6.00-14's?  

 

Speedometers usually read high so you won't exceed the speed limit given wear and tire size variations. 

 

My 205's definitely result in speed faster than indicated but I haven't checked odometer accuracy.

I want to do compare GPS trip mileage with odometer which will allow backing out the precise tire diameter for no odometer error.  But my Garmin is starting to fail finding satellites.

 

I figure this topic is fully discussed with the last tape measurement (!)

The only thing left are some GPS odometer results to see what "the gears" say.

 

 

Edited by Cardinal Grammeter
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Minor math correction 25.47 + .25 = 25.72

 

Guugole maps on my phone gives me mph when its giving directions, around here there are portable radar speed limit reminder signs if you find one you can use that.

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4 hours ago, Ooph! said:

Minor math correction 25.47 + .25 = 25.72

 

Guugole maps on my phone gives me mph when its giving directions, around here there are portable radar speed limit reminder signs if you find one you can use that.

 

Thanks, I edited in your correction (I don't know what I was thinking.)

 

Accurate mph is available but there is speedometer error relative to the odometer.  Of course you can go an indicated 60 mph, and see how long it takes the odometer to increase 1 mile - it should be 60 seconds if the speedometer is spot on.

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UPDATE:  Got my Achilles 185r14's and they look like Drag Skinnies (!)  Can't wait to get them on the front.  Hell, would look good with tubbed rears (!)

 

They are Achillies 122's All Season and looks like they might be  half decent in the snow with all those sipes.  (won't know for sure until I get a pair for when the Douglas rears wear out.  When the rears get lower than the fronts, I may runout the Douglas on the front with the better Achilles on the rear.  Best tires on back always - especially with a pickup.)

 

Sidewalls are very stiff and the opposite of the paper thin Walmart Douglas's.

440AA tread wear

PLIES:  Tread:  2 polyester, 2 steel, 1 nylon - Sidewall:  2 polyester.  NOTE: as stiff as the sidewalls were, I was expecting a few more plies.  Obviously these are not 6 or 8 ply Light Truck tires but that's OK with me.

 

Below is a pic of truck when I bot it with narrow tires on the front, might have been 185/75r14 but I don't know.  

Back then they had the torsion bars jacked sky high which make it look like a "cute little toy truck."

I lower the front back to where it should be and with these new tires, it's going to look more like the toy truck again (now has 205/75r14's which are a PITA to get the beads to pop on the 4.5" rims.

 

BTW, I NEED ONE MORE 4.5" RIM (!)

 

0131222132.thumb.jpg.7af70749ac7ca8979f6b46a6a7c24920.jpg0131222133.thumb.jpg.af1e41ecd1589d664b3f3b1ae5924f19.jpg152993292_620_in_the_yard_1-Copy.thumb.jpg.b79176428929720ee272e59ee1210789.jpg

 

Edited by Cardinal Grammeter
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  • 3 months later...
Posted (edited)

UPDATE:  Achilles 185r14's Mounted and In Use in Front

 

I LOVE THEM 

 

Much easier to park and steer, the slower the speed, the easier.  (turning while stationary is still not easy)

 

Drive style has changed - I find myself "darting" about more - driving more like a sports car with quick steering (less effort translates into more steering input.)

 

Can't wait to see how they go in the snow, but I think this winter I'll run out the 205/75's on the rear - so it won't be until the 23-24 winter.

 

RE:  2024:  TOTAL SOLAR ECLIPSE:  DO NOT MISS!   (if you've never seen a total, you've seen NOTHING!)

 

https://eclipse2024.org/eclipse_cities/statemap.html 

Edited by Cardinal Grammeter
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I'm near Pittsburgh, PA and the path through Texas, Indianapolis and over Lake Erie very close to Cleveland, Erie and Buffalo

Unfortunately it is far from 620 Country (Pacific Northwest) but it is right through The Rust Belt

 

I saw the one a few years back, and talk about luck - it went right through my best friend's yard in Simpsonville, SC.

 

Here's an interactive map:

https://eclipse2024.org/eclipse_cities/statemap.html

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I was right in the path of the solar eclipse (2020?) here in Oregon. It was AWSOME! It got colder as the eclipse came over, and it got just like night (without the moon) as far as darkness. My church (definitely in the country) had the campus open and we went there since there it was more open than at home (trees).

 

Don 

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1 hour ago, 620slodat said:

I was right in the path of the solar eclipse (2020?) here in Oregon. It was AWSOME! It got colder as the eclipse came over, and it got just like night (without the moon) as far as darkness. My church (definitely in the country) had the campus open and we went there since there it was more open than at home (trees).

 

Don 

 

It'm impossible to explain it to people.  It was very emotional for me.  I could only imagine how it effected people before they started writing stuff down - the tales from ancestors must have been supernatural.  

 

Did you see any shimmer right before total?  I believe you need a smooth solid light colored surface to see it - not possible if grass and trees.

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We had a very small partial a while back and the light was 'different'. It was about as bright but didn't seen to be as warm on the skin. Anyway I poked a pencil through a piece of cardboard and held it up. Where the sun shone through is produced a sun image on the ground with a small notch in it. Where it shone through the leafy cover of the trees it formed hundreds of sun images with a notch cut out  all over the ground.  

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Posted (edited)

YES (!) to the Tree Leaf Projectors!  It's a great effect and more fun that the paper pinhole stuff.  And it seems that most places fail to mention the treat leaf phenom

 

I've seen at least 2 partials and they are NOTHING compared to a total.  In fact it is amazing how little sunlight is required to create "daylight."  A total goes from "daylight" to "nighttime" in not much more than 10 seconds.

 

After seeing a total at 67 years old (my first one), it is my conclusion that everyone should make whatever effort is required to see at least one.  NOTE:  I don't know how dark it gets if it is cloudy, but if it actually gets dark (may have to be at the center of the path in this case) it would still be worth the effort.  During total, I was torn between looking through stabilized binocs, looking at sun with naked eye, or just looking around at my surroundings.  I had 2 minutes and it was frustrating that the time was so short.

What is interesting is that totals have various moon sizes and the real loser is the Ring Eclipse where the moon is "smaller" than the sun.  You get to see a Ring, but it just doesn't get dark.  The real bonus is when the moon is at it largest which really increases the total time - I think 3 min is about the max.

Edited by Cardinal Grammeter
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3 hours ago, datzenmike said:

We had a very small partial a while back and the light was 'different'. It was about as bright but didn't seen to be as warm on the skin. Anyway I poked a pencil through a piece of cardboard and held it up. Where the sun shone through is produced a sun image on the ground with a small notch in it. Where it shone through the leafy cover of the trees it formed hundreds of sun images with a notch cut out  all over the ground.  

 

My memory for exact details is just a bit sketchy now, but as I remember it the "shadows" were a bit different. Part of the church grounds used to be a farm and there were old fruit trees there. Some of the "shadows" cast by the fruit trees had multiples of the same image. The full darkness lasted for only a short time, short enough that I couldn't see all there was to be seen.

 

I definitely would recommend that if you can see a full eclipse of the sun, do see it, even if you have to go many miles out of your way. We had somebody come up from California to the central Willamette Oregon area just to see the eclipse. That definitely was a once in a lifetime experience, and it was the only full eclipse that I've seen in my over 70 years.

 

Sorry for the hijack, but when the subject came up I had to say something.

 

Don

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