Hey guys,

So i recently bought some new wheel (vossen cv7) and I need help buying the right size of tires. I was wondering if you guy can help me with this. I got some 20x8.5 front and 20x10 rear. And to tell you the truth I'm don't know the offset because I don't know much about wheels. I got a 2010 e350 drops 1 inch on H&R springs. The dealer that sold me the wheel recommend it me to buy 245/30/20 front and 285/25/20.. So I was wondering if anybody running the same set up what size tires you used or anyone that know about tires could let me know. My only concern is not rubbing so I don't mind a little stretch on the tires. Thank you in advance

 

Those tire sizes should work fine (there are several E-Coupes with the same tire and wheel sizes). But without wheel offsets it's impossible to determine if they would actually fit without rubbing especially with a drop.

 

Yea so I just got my wheels delivered and they are 20x10 et 55 and 20x8.5 et 45..

 

So I'm still looking for some suggestions. My wheels are 20x8.5 et 45 front and 20x10 et 55 rear.. I wanna know if I could run 245/35/20 front and 285/30/20 rear without rubbing in the fender or anywhere else.. The only reason I wanna run those is because I want a little more tire than the suggested tire size.if not I'll just go with the recommended tire size..I attached a picture of how I want my car to look if that gives anyone an idea of what I want..pls let me know and you got some pictures running similar size post it so I can see it and can make a decision..

 

based on my research reading through most of the forum threads on 20" wheels, the optimal tires size are:
245/30/20 front
275/30/20 rear

good luck and post some pics!

 

please delete

 

I'm running my tires stretched, and seeing as you want more meat, my setup is probably useless to you. CV7s, dropped on H&R Sport springs as well.

Front: 20x9" +45 offset +3mm spacer - 235/30/20 - plenty of clearance
Rear: 20x10" +42 offset - 285/25/20 - clear, but it's pretty tight

 

Using SnakeDoctor's specs as baseline:
20x9 +42ET (effective offset with +45 and 3mm spacer) Front
20x10 +42ET Rear

The front wheels will have 3mm more clearance on inside and 9mm less poke. Your desired tire size of 245/35-20 is about 26.8" total diameter so over an inch more than 235/30-20 (25.7" diameter). So you need to consider the 10mm wider and 1" taller tire (if SnakeDoctor's front setup has at least 8mm (3mm + 5mm (1/2 of 10mm)) clearance to the strut housing and with 1/2" higher tire (from center of wheel) then you should be fine.




The rear wheels (since same width) will have 13mm less clearance on inside (to strut housing) or 13mm less poke. This may not work depending on how much clearance is available to strut housing. Your desired tire size of 285/30-20 is about 26.7" total diameter so also over an inch more diameter than 285/25-20 (25.6" diameter). As SnakeDoctor noted - his setup is already pretty tight so it's not looking good that the rears would fit (may need spacers to bring the wheel out more).



Also, keep in mind that your tire diameter from OEM stock (255/35-18 on rear is typical size) is about 1.7" more which would cause a noticeable difference in speedometer accuracy (with larger diameter tires your actual speed will be more than what is indicated on speedometer).

Offset calculator:
https://www.1010tires.com/Tools/Whee...et-Calculator#

Good luck and please post what you end up working with (including pics) as this would be useful on this forum.

 

I'm running 255/35-19 tires on 19x8.5 ET40 Front and 285/30-19 on 19x9.5 ET45 Rear. I am not dropped (yet) but I should have clearance for a mild drop (less than 1 inch).

https://mbworld.org/forums/e-class-c...0-coupe-3.html

 

hello guys update on the wheels and tires, sorry I haven't posted before and today was the only day I had of and had time to do the wheels and tires.

So I run into some issues (fml)
So I went to a shop and I asked for some tires that would fit my wheels and that it wouldn't rub anywhere in my car. They put on 245/35/20 front and 275/30/20 rear. The rear fit fine no problems there now when they went to put on the front the tire hit the strut. I was mad because I told them to sell me tires that would fit and that's what they gave me, anyways I asked them for a solution and they said put some spacers on, I said and went to another shop to get spacer.

The second shop checked it out and said the spacer that would make the wheels and tires fit would be so big that the wheel would go pass the fender and it would be too much so they they said they could test fit the wheel and tell me what spacer and size tire I would need for the wheel to fit but they would have to charge me to do that so I said **** it just get it done.. Now this shop recommends 235/30/20 plus "maybe" spacer and 275/25/20 no spacer. At this point I just want to kill myself cuz I need new tires and he is not even sure if it will fit or I I even need spacers.

So after that I went to the first shop to return my tires I talked to the owner about the new tires and they said its nearly impossible to find those tire size. Still at that shop I called 2 other tire shops and asked for those tires and they said the same, actually one said they could get the tire but it was going to be expensive like $350 per tire so I said I would call back cuz I fell that a little too expensive so I went back in the same shop to talk to the owner but somehow he had left already so I asked the workers if I can return the tire that They put on like an hour earlier and that still in my trunk and they said I have to wait for the owner till tomorrow to talk to him if I want to return it or exchange it..

So I have a questions before I blow up this wheels and tires.

1) is it possible to to run same tire side wall on the front and the back or does the back has to be smaller? Let's say can I run 235/30/20 front and 275/30/20 rear.. That way I can keep the rear tires and try somehow to find just the front wheels. Does having smaller rear tire sidewall make a difference in the car? One guy at the tire shop said I always need the rear tire with smaller sidewall because of the traction control..I don't know if that's true. Any help will be appreciated thanks

 

I'm thinking of trying out your set up cuz I just had a big fail when I used someone else suggestions..

My offset on the rear wheel is 55+ you thing you set up would still work?
Vossen dealer dealer said 245/30/20 and 285/25/20
Tire shop said 235/30/20 and 275/25/20

 

i have 20x8.5 et44 245/30/20
20X10.5 et45 285/30/20 + 3mm spacer

with H&R springs, No rubbing so far.

 

Do you have any problem in the front?

I contacted many ppl and even vossen dealer and they suggest the same as you. And they also said they might be some to no rubbing in the rear but for me the last thing is the rear cuz I have no problems there but the front are having issues with and many shops can't seem to find the problem most tires seem to rub on the strut and I have received 2 tire sizes for the front so I don't know which to get lol

Another question Is are you having any issues running 30 side wall on the front and rear?? Cuz I asked the shop today and they said if the front is 35 the back has to be 30 or if the front is 30 the rear has to be 25 but they didn't give me an specific explanation..

 

The second number in the tire specification is the aspect ratio, 30 is 30% of the width, 25 is 25% of the width etc. This means that if you are running 245/30 in the front, the sidewall will be 73.5mm [245*30%]. In order to maintain the sidewall width on staggered wheels the aspect on the rear must be less ... 275/30 would be a 82.5mm [275*30%], 275/25 would be 68.75mm [275*25%] and 285/25 would be 71.25mm [285*25%].

When the tire width is staggered you should have a lower aspect ratio on the wider rear tires to maintain the actual sidewall width front to back. A 30 ratio on the rear will be much more difficult to fit if you are already worried about rubbing.

 

Oh ok now that an actual answer. Thank you, I went to 3 tire shops yesterday and asked the same question but no one gave me an actual answer.

On shop said they both different number because of the traction control and I had no idea what he meant.

 

Any update, any pictures?

 

So I recently got my tires mounted on the ca and it finally fits.. So I went with 245/30/20 on the front and 285/25/20 on the rear.. No stretch tires or spacers needed, also there is no rubbing in the struts or the fenders. I will post pictures soon

 

So im using my iPad and it only allows me to upload one picture idk why but here one picture lol so wheels size are 20x8.5 +44 and 20x10 +55.. I will post more pics when I get home and use my laptop.

 

U doing & doing & doing it well......!

 

Looks great!

 

Damn it, had i known 285/30-20 tires would fit in the rear with no rubbing issues on h&r springs i would've gotten those tires... I went with 275/30-20... Well, maybe when i need to replace my tires...

 

here is a couple more pics of how my setup looks.i hope you guys like it as much as i do.i might get some coilover in the near future just to lower the car a little bit more in the front and in the rear without rolling out the fenders.