How much tire can you stuff in a w126? - Mercedes-Benz Forum
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post #1 of 52 (permalink) Old 02-08-2017, 09:41 AM Thread Starter
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How much tire can you stuff in a w126?

Do you fellas have a tread like the ones I've created for other models like the 107?

I have a square set of wheels, 8x16 et11, and I want to put the same size tires on all four and want the biggest I can fit, even if a little fender rolling is needed.

I had 10x17 et19 on the rears with 265/40/17 and 8.5x17 et20 on the front with 235/45/17 with no issue.





That car has a dog-ear AMG front spoiler that has yet to go on it, but I don't want to rip it off. I guess I could plan to use the staggered wheels shown here in the end, but for now, I'd like to run my black center rial N mesh wheels as wheels went to the shop for repair (and center painting).

I've got a bunch old older dried out 225/50/16 tires that would be good to burn up, but they seem to hard to mount. I've got some fresher 245/50/16 tires, and figure they would be ideal if I can stuff them in there. I don't mind if they end up getting a little damaged from rubbing since these are used tires.

Anybody know if I will be able to at least temporarily squeeze 245/50/16 on 8x16 et11 until I put the front air dam on?

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post #2 of 52 (permalink) Old 02-08-2017, 01:48 PM
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50 0r 55 I think


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post #3 of 52 (permalink) Old 02-08-2017, 03:43 PM
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I wouldn't go any bigger than 55, I put 60's on mine and had rubbing issues up front so now have 50's up front with a spare pair of 60's for the back (whenever they wear out), all 4 are 225 btw

Some days it's just not worth chewing through the restraints
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post #4 of 52 (permalink) Old 02-09-2017, 06:48 AM Thread Starter
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How much tire can you stuff in a w126?

Quote:
Originally Posted by wooky_chew_bacca View Post
I wouldn't go any bigger than 55, I put 60's on mine and had rubbing issues up front so now have 50's up front with a spare pair of 60's for the back (whenever they wear out), all 4 are 225 btw


The middle number is the sidewall height as a percentage of the tread width. So 225/50/16 has a sidewall height of 50% of 225 = ~112.5mm
225/55/16 would be 55% of 225 = ~123.75mm

245/50/16 has a sidewall height of ~122.5mm

So the height is pretty similar on 245/50/16 and 225/55/16. Perhaps 245/50/16 would fit in the rear on 8x16 et11, but I'm thinking it would be ideal to go with the narrower 225/55/16 on the front. But will 245/50/16 fit on the front? Anyone ever try? Does it help if the car is lowered? Normally I would think it doesn't because the top would be more likely to rub, but on the 107 chassis (which I'm most familiar with), the first thing to rub is always the front outer edge of the tire on the air dam when turning. On a lowered car, the leading edge of the tire ends up more into the wheel well, making it less likely to rub. See picture below of @nobby 's r107 before lowering for an example. I'm not sure if this applies to w126. (I just got my first w126 a few months ago.)



Can you see how lowering the car would put the running point lower on the tire, below the leading edge?

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post #5 of 52 (permalink) Old 02-09-2017, 02:27 PM
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Mine was lowered by PO and even the 17's it came with, with 235/45/17's rubbed up front. I was able to get my 16's figured what would and wouldn't work, 50's yes, 55's maybe but not gonna try, 60's no

Some days it's just not worth chewing through the restraints
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post #6 of 52 (permalink) Old 02-09-2017, 05:25 PM Thread Starter
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Quote:
Originally Posted by wooky_chew_bacca View Post
Mine was lowered by PO and even the 17's it came with, with 235/45/17's rubbed up front. I was able to get my 16's figured what would and wouldn't work, 50's yes, 55's maybe but not gonna try, 60's no


Interesting. What was the offset on those 17" wheels? And where did the front tire rub? Inside? Outside? Front? Back?

I didn't notice any rubbing on my 235/45/17 on the 8.5x17 et20 fittipaldi OZ 3-piece wheels I was running for a while. They were so worn and out of balance that I never really got them up to speed though. Too much vibration. I dropped them at the wheel shop and the plan is to replace with 235/45/17, but I was even considering 245, but the wheel shop discouraged that idea. Looking at the comparer after saying I want to burn up the rears, I can see why he discouraged changing the front size (ignoring that 265/40/17 seem pretty non-existent now).


The 265/40/17 on et19 is pretty snug and stuffed looking. I understand AMG did 2mm wider on their oz-3-piece, but those were really designed for r129, and I believe that many r107 owners have not been able to fit 275 tires, only 265. That may be irrelevant in the w126, but I could see how 275/40/17 might rub on a w126 too, especially in et17 (instead of my et19).

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post #7 of 52 (permalink) Old 02-09-2017, 07:47 PM
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I don't know what the offset was and the tires rubbed on hard bumps along the upper edge of the fender, which had been rolled some and I rolled them a bit more. Both sets of wheels, the 16'd with the 60's rubbed the front bumper on turning

Some days it's just not worth chewing through the restraints
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post #8 of 52 (permalink) Old 02-09-2017, 08:10 PM Thread Starter
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How much tire can you stuff in a w126?

I'm starting to think I should just go ahead and get an idea my trying to mount the two 10x16 et11 w 245/50/16 on the front and back to see what happens before removing the tires from those wheels. I've got to get some good empirical evidence. There's got to be lots of threads like this around the w126 forum.

Edit: here's a favorite so far. Several mentions of tire sizes and pics on 8.5x17 et13. It makes me think the big tires on the front are a bad idea. W126 just seem to beg for a staggered setup it seems. My fittipaldi oz 3-piece wheels are looking better and better for this 500se. https://www.benzworld.org/forums/w126...l-fitment.html

And another great single post by @KRH stating some ideal offsets: https://www.benzworld.org/forums/w126...l#post12865369

.


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post #9 of 52 (permalink) Old 02-11-2017, 06:58 AM Thread Starter
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Last night I tried to mount up the old 225/50/16 tires I originally wanted to put on my rial N 8x16 et11 wheels. I ended up tearing the bead, and on the one wheel I got one of those old dry tires onto, I couldn't get it to pop on the bead. The tear was too big.

After that hour+ long struggle, thinking that the $25/tire I often pay for mounting and balancing seemed WELL worth it.

I decided to try one of the four used Kumho Ecsta 245/50/16 tires on a rial. Pop. Right on there. No issues. Nice. So I removed the worse one from one of the two 10x16 et11 bbs rs058 wheels that is left them on, and decided to leave the better one still on that 10" wheel for some test fits. I mounted (but didn't balance) 3 of the four rials, as I think that is what I will end up running on my 1985 500se for the foreseeable future. I was really tempted to just mount the fourth, but could see myself wanting to kick myself for not test fitting the 10" first. I know it won't even come close to fitting my 1985 280sl r107. So I should see if these will fit anything at all.


First I took some pics of the 225/50/16 tire I could not inflate or get on the bead next to the two 245/50/16 all on rials. The height difference looks significant (keeping in mind that 245/50/16 is about the same as 225/55/16 which others say is ok).







I tried to take some pictures of both the 8x16 et11 and 10x16 et11 both with 245/50/16 to show the difference, all in the sidewall bulge.






Next is to try them on the car(s), hopefully today.

.


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post #10 of 52 (permalink) Old 02-11-2017, 08:10 AM Thread Starter
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How much tire can you stuff in a w126?

Well, I had a hunch that w126 cars need a staggered strip to stuff the wheel wells, but I hadn't anticipated this. I'm not seeing any rubbing points, but the fronts just looks ridiculous.




Ironically, the same tire size, even on a 2" wider 10x16 et11 wheel looks totally fine to me.




I'm going to edit back in some videos. Not sure why they aren't working. I may have to post on YouTube (normally I can upload via tapatalk).




.


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Last edited by Fonzi; 02-11-2017 at 08:29 AM.
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