Correct tire size for W115? - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 04-05-2015, 04:38 PM Thread Starter
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Correct tire size for W115?

May already be a thread on here for this but can't find it. I don't think they make the size Mercedes intended the car to use anymore. What's the closest modern tire size to the orignal that works best on them?

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post #2 of 9 (permalink) Old 04-05-2015, 05:47 PM
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Sure they do. www.cokertire.com is the place for you, Mr Purist.
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post #3 of 9 (permalink) Old 04-05-2015, 06:12 PM Thread Starter
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haha, awesome site thanks! Vredestein vs. Michelin. The extra price for Michelin worth it?

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If that price is per-tire, it makes nonsense for a daily driver.

Correct tire size for W115?-imageuploadedbyautoguide1428282283.682115.jpg

The tire size conventions have since changed, and I believe about a 185/70/14 or 185/75/14 is about right in modern sizing conventions but I don't know.
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post #5 of 9 (permalink) Old 04-05-2015, 08:22 PM Thread Starter
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Originally Posted by Fonzi View Post
If that price is per-tire, it makes nonsense for a daily driver.

Attachment 1387993

The tire size conventions have since changed, and I believe about a 185/70/14 or 185/75/14 is about right in modern sizing conventions but I don't know.
Right, those are for the shows. A tad expensive to be driven every day. Anyways I have this chart from Tirerack for Mercedes cars but do not know how to make it out. Maybe you can make sense of it. Does it apply to W115's?


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post #6 of 9 (permalink) Old 04-06-2015, 07:45 AM
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Well, my obvious first question would be what size is on the car now. Absent that information, if the car originally came with Bias Ply tires, they were likely a 185HR14....185 being width and 14 being rim diameter. The problem with the old bias ply specs is that aspect ratios were different (and much taller). Typical aspect ratios for bias ply were 80-90 although toward the end, they were producing bias ply tires with ratios of about 78.

So, a 185HR14 with an aspect ratio of about 80 is equivalent in diameter to a modern 195-75R14 or between a 205-70R14 and 205-75R14.

I personally am running 205-75R14 on my W108 chassis because I wanted a little wider tire and the higher aspect ratio slows highway RPM just a bit. No issues with rubbing. I think they fill the wheel wells correctly.

I chose Hankook tires ($61 at Wal-Mart) because they are one of the rare white stripes left.
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post #7 of 9 (permalink) Old 04-06-2015, 08:57 AM
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This 1971 250c w114 apparently had 175 HR14 originally.

http://pages.ebay.com/link/?nav=item...d=331516936171

Correct tire size for W115?-imageuploadedbyautoguide1428332245.335007.jpg

You can use the chart above to determine the tirerack replacements for that size.

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post #8 of 9 (permalink) Old 04-13-2015, 08:24 PM
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I think my W123 240D may have originally come with 175 tires. Forget originality. It does just fine with 195-70R 14 Michelin Xs and the speedometer/odometer has been reading almost dead-accurate.

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post #9 of 9 (permalink) Old 05-05-2015, 02:56 PM
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I know it isn't correct, but my 1970 250c coupe came with these 205/75/14 tires with lots of tread, and I always liked the way the car seemed to sit up more nicely than my 1972. Well, I finally swapped out the 185/75/14 (on the 1972). I see I have at least one 185/70/14 also. The 205/75/14 are pretty significantly larger, but I really like it.

After: 205/75/14
Correct tire size for W115?-imageuploadedbyautoguide1430859032.522434.jpg
Correct tire size for W115?-imageuploadedbyautoguide1430859142.870544.jpg

Before: 185/75/14
Correct tire size for W115?-imageuploadedbyautoguide1430859188.870107.jpg
Correct tire size for W115?-imageuploadedbyautoguide1430859219.270458.jpg

Not talking about a huge difference, but much better than these which I think were 185/70/14 I believe:
Correct tire size for W115?-imageuploadedbyautoguide1430859325.620630.jpg
Correct tire size for W115?-imageuploadedbyautoguide1430859348.137664.jpg
Correct tire size for W115?-imageuploadedbyautoguide1430859380.119649.jpg

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