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  #16  
Old 12-13-2018, 01:36 AM
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Originally Posted by vwnate1 View Post
I'd have to go look at my 1982 20D to see what the tire size is, there's a sticker in the driver's door jamb, go look at it and use that size . the car is far from here right now, I can go look if you want but your car has the info.
Yes, IIRC that sticker says the OG tire size, which was 175SR14. That tire size doesn't exist anymore. I think that's what it is in my '79.

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  #17  
Old 12-13-2018, 12:10 PM
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Originally Posted by Maximan1 View Post
Yes, IIRC that sticker says the OG tire size, which was 175SR14. That tire size doesn't exist anymore. I think that's what it is in my '79.

Unless the missing aspect ratio is something bizarre, it certainly does exist.
I have a set of four on my ride that match the original spare in the trunk (175/70/r14)
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  #18  
Old 12-13-2018, 12:15 PM
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Originally Posted by vwnate1 View Post

If you do fuel economy checks and are a critical driver you'll notice the extra unsprung weight shaves a few miles off and definitely cause shorter shock, bushing and so on life
I don’t understand what you mean here. “Unsprung weight”?
Shaves a few miles off meaning decreases? And are we talking wagon wheels or the wider tires?
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  #19  
Old 12-13-2018, 01:33 PM
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Originally Posted by Shern View Post
Unless the missing aspect ratio is something bizarre, it certainly does exist.
I have a set of four on my ride that match the original spare in the trunk (175/70/r14)
My original spare was 175SR14. Closest size I could find was 195/70R14. 175/70R14 were smaller than the OG size. What is the DOT date code on your spare?

Edit: found some pertinent information

Quote:
Originally Posted by BobIsTheOilGuy forum
ETRTO (European Tyre and Rim Technical Organization) lists a 175R14 as being a LI of 88 in a Standard Load with a diameter of 634mm.

A 195/70R14 had a SL Load Index of 91 (OK there!) with a diameter of 630mm (OK there, too!) with an allowable rim width range of 5" to 7" (OK there as well!) Overall, that seems a good fit!

...

What about the 185/65R14? - LI 86 (Too Low!), diameter 570mm (a 10% loss!), and an allowable rim width range of 5" to 6.5" (That's OK). Overall not a good choice.
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Last edited by Maximan1; 12-13-2018 at 02:16 PM. Reason: Added info
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  #20  
Old 12-13-2018, 02:54 PM
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Originally Posted by Shern View Post
Unless the missing aspect ratio is something bizarre, it certainly does exist.
I have a set of four on my ride that match the original spare in the trunk (175/70/r14)

The non aspect ratio tires actually exist. They are the more or less equivalent to a " 83 " ish series.

This non aspect ratio listed tire was also found in 15 ( Like air cooled VW / pre 81 SAAB 900 and others ) and probably other sizes.
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  #21  
Old 12-13-2018, 05:32 PM
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195/70R14 in Michelin Defender. $425 for a set of four. Done.
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  #22  
Old 12-13-2018, 07:14 PM
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Originally Posted by vwnate1 View Post
Curious, how did you like the 15" wheels on the CD ? .

I'd have to go look at my 1982 20D to see what the tire size is, there's a sticker in the driver's door jamb, go look at it and use that size . the car is far from here right now, I can go look if you want but your car has the info.

Resist the urge to $ave a few dollars on tires ~ this car came to me a decade ago with brandy new Chinese (?Kumho maybe?) tires, they stuck O.K., not great but wore rapidly and one time I got a nail in the tread on the freeway, slowed way down and by the time the next exit came up the tire was toast due to heat .

Not good, false economy .

My gray market 300TD came with 15" wheels, it's nice, rides well, and handles well too, I'm not allowed to slap it 'round like I do my Coupe and 240D sedan because I bought it for SWMBO so it must remain clean and pretty, if I wadded it my sex life would screech to a distinct halt I fear .
Love 'em. Stick like glue and I can use nicer wheels. Do have a little speedo error that I'll someday fix even though I tried to keep overall diameter close.
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  #23  
Old 12-13-2018, 09:10 PM
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Post Stock Tires

Yes, the middle # used to be R or SR, it's equivalent of now 70 .

I measure the defenders and they were the same diameter, for me this is important ans I like to drive long distances across the Desert and don't want to buzz my little 240D's engine to death .

'unpsrung weight' means the weight of the axle as well as the wheels and tires .

Reducing it anyway you can, improves handling and traction through corners and bumps at speed .

The light alloy wheels (disc typ on my 240D, Bundt typ on my coupe,) reduce the amount of power necessary tp get things rolling, meaning ,ore power available to get up to and maintain speed .

When folks talk about "German Engineering" mostly they have NO IDEA about the importance of the small details, Mercedes does, why our 40 year old W123's are still going strong and are a joy to drive .

Fat tires reduced driving enjoyment sharply, this is why Hot Rods aren't driven much after they slap on those HUGE wide tire$ .

Power steering helps a lot but the -feel- of the road, is lost .
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  #24  
Old 12-16-2018, 04:39 PM
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Originally Posted by Maximan1 View Post
My original spare was 175SR14. Closest size I could find was 195/70R14. 175/70R14 were smaller than the OG size. What is the DOT date code on your spare?

Edit: found some pertinent information
upon closer inspection: it is indeed 175 SR14 (no aspect ratio), DOT FUJ3 A4D X 320

Quote:
Originally Posted by 97 SL320 View Post
The non aspect ratio tires actually exist. They are the more or less equivalent to a " 83 " ish series.

This non aspect ratio listed tire was also found in 15 ( Like air cooled VW / pre 81 SAAB 900 and others ) and probably other sizes.
Quote:
Originally Posted by vwnate1 View Post
Yes, the middle # used to be R or SR, it's equivalent of now 70 .

I measure the defenders and they were the same diameter, for me this is important ans I like to drive long distances across the Desert and don't want to buzz my little 240D's engine to death .

'unpsrung weight' means the weight of the axle as well as the wheels and tires .

Reducing it anyway you can, improves handling and traction through corners and bumps at speed .

The light alloy wheels (disc typ on my 240D, Bundt typ on my coupe,) reduce the amount of power necessary tp get things rolling, meaning ,ore power available to get up to and maintain speed .

When folks talk about "German Engineering" mostly they have NO IDEA about the importance of the small details, Mercedes does, why our 40 year old W123's are still going strong and are a joy to drive .

Fat tires reduced driving enjoyment sharply, this is why Hot Rods aren't driven much after they slap on those HUGE wide tire$ .

Power steering helps a lot but the -feel- of the road, is lost .
I guess I'm still unclear... some say the 185/195/70 is a closer substitute than the 175/70s I'm running now.

Here's another question... say I decide to replace the two front tires which are more worn than the rear, would it be a bad idea to replace those with 185/195 and make sure they were always a pair when rotating front and rear? Or is this unadvisable?
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  #25  
Old 12-16-2018, 04:51 PM
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Originally Posted by Shern View Post
Here's another question... say I decide to replace the two front tires which are more worn than the rear, would it be a bad idea to replace those with 185/195 and make sure they were always a pair when rotating front and rear? Or is this unadvisable?
This really isn't a difficult problem. 185, 195 or 205 will all fit. I've done it many times on these cars. As long as it is XXX/70/14, you will be fine.

A set of four of these tires is very inexpensive. Go pick out a brand name (not Chinese) and you will be happy. Michelin, General, Bfgoodrich, Goodyear, etc... will all work. A set of four should be under $400. Enjoy worry free driving for the next 50,000 miles.
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  #26  
Old 12-16-2018, 07:00 PM
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Originally Posted by HarvAMG View Post
This really isn't a difficult problem. 185, 195 or 205 will all fit. I've done it many times on these cars. As long as it is XXX/70/14, you will be fine.

A set of four of these tires is very inexpensive. Go pick out a brand name (not Chinese) and you will be happy. Michelin, General, Bfgoodrich, Goodyear, etc... will all work. A set of four should be under $400. Enjoy worry free driving for the next 50,000 miles.
Thanks —my two rear tires are fine... will likely buy a pair of defenders but ideally in the width closest to spec (which at the moment seems anywhere from 175-195). Really just wondering if running 2 different widths (195 front, 175 rear) will cause me any grief.
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Last edited by Shern; 12-16-2018 at 07:01 PM. Reason: Sp
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  #27  
Old 12-16-2018, 07:09 PM
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Originally Posted by Shern View Post
Thanks —my two rear tires are fine... will likely buy a pair of defenders but ideally in the width closest to spec (which at the moment seems anywhere from 175-195). Really just wondering if running 2 different widths (195 front, 175 rear) will cause me any grief.
Why not buy 195s and put the fresh rubber on the rear?
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  #28  
Old 12-16-2018, 07:44 PM
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Some folks don't use these cars every day, or drive a lot of miles, so the tires will rot out before they wear out. I see no problem with running a pair of 185 0r 195's on the front, and run them till the rears wear out. However, you could buy four new tires, and save one of the best tires for your spare. I have also had experience with ruining a good tire (road hazard), and needing an extra matching spare. In this case, it wouldn't hurt to save the extra good tire just in case. I personally have several 123's around at all times (five on my insurance at the present time) , so having good extra tires around is never a bad thing......Rich
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  #29  
Old 12-16-2018, 11:07 PM
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Originally Posted by Shern View Post
upon closer inspection: it is indeed 175 SR14 (no aspect ratio), DOT FUJ3 A4D X 320

. . . . I guess I'm still unclear... some say the 185/195/70 is a closer substitute than the 175/70s I'm running now.

The best thing to do when selecting an alternate tire is to use the manufacturers web site ( or Tire Rack ) and look at actual tire specs. They will show actual unloaded diameter, revs per mile , tread width , overall width.

For the most part, a specific size of tire will be within a small margin across all brands.
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  #30  
Old 12-17-2018, 04:32 PM
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That’s a great call. I mean the lack of consensus here is astonishing: 175 Sr 14????? 220/8 (1971)

After a peep on tire rack, I’ve learned the aspect free original tires had a diameter of 25”. 175/70 are around 23.8, 195/70 are 24.8 which is about as close as I could get to the original.

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