Put some wheels on and got some problems!!!!
A PLUS 3 fitment might be completely throwing the wheel sensors off....compare the stock rolling diameter (front and rear) to the setup you have now. Another suggestion is to pop an email off to Luke at Tirerack as I'm sure he has seen this situation on occasion. I'm sure you're not the first guy to squeeze 20s on a W208.
How are you fitting 285s in the rear?? Aren't you rubbing?
Have you tried going back to your old wheels to see if the issue goes away?
i ran 17's in front and 18's in the rear for 3 weeks i had no lights or anything out of the norm.... and i had 20's on my W202 C.. and also no lights....
Something is rubbing... or rubbed something the wrong way....
Last edited by TuneTime; Apr 23, 2008 at 02:32 AM.
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thats exactly what happened the 1st time they put the rims on..>The lugs were too long and when they test drove the car they said it was clicking from the lugs hitting something so they took the lugs back out and put shorter ones instead. Do you think that damaged something to cause the lights? What would it have damaged if anything?I had never had any lights come on prior to this happening.
The Best of Mercedes & AMG
0720 Speed sensor
0500 Vehicle Speed sensor
tried to reset them but it won't allow them to reset because there is a check engine light assc with these codes stating the speed sensor is not even there at all. So I changed the RF speed sensor just now...and still code, still problems. I am so tired of this. I just ordered the rear speed sensor will be here tuesday...

If you fit 245/35/20 on the front then they will be exactly the same rolling diameter......clear the codes, problem solved

If you fit 245/35/20 on the front then they will be exactly the same rolling diameter......clear the codes, problem solved

If 245 is too wide for the front, try a 235 front and 265 rear.
selection of tires was flawed. the rolling circumference differential between
front and rear tires is waaay off....5 inches per revolution (!). velvet fog is
spot on in his prognosis.
Bet your cruise control doesn't work either.
If I am correct your oem tire size was a 245/40/17 on the rear so its diameter was 24.71 inches,your new rear tires are 26.73 inches in diameter that 2 inches difference in diameter equals 65 fewer revs per mile from your stock tires effectively changing your gear ratio to an 8 percent taller gear,throwing your speedometer way off and hurting overall performance off the line,and causing the havoc with all the sensors and warnings and transmission problems.
So not only are they off in diameter front and rear causing problems,they are 2 inches greater in diameter then your oem tires and therein lies your greatest problem.
Long story short all 4 tires need to go,ask Luke to match a set of 20's to stock diameter and then all you will have to worry about is the increased braking distance you will suffer.
ohlord

a 235/35/19 front and a 265/30/19 would have been the correct set up.Both within 20 revs per mile from stock and well within the acceptable margin of error of under 3 percent,but since that is a pricey mistake the best you can hope for now is to try and find the 20's that come close to oem diameter if you can
Last edited by ohlord; Apr 28, 2008 at 04:06 AM.
BTW my original front tire size was 245/35 but they hit the knuckle so the tire guy picked this drastic change of size. Otherwise I think I would have been OK

let's just say I wouldn't recommend anyone try this at home...it's waaaaaaaaaaaaaaaay too close. The wheels are touching the body when the car is in the air. Not until the car is on the ground do they clear by a few hairs
Last edited by howie; Apr 28, 2008 at 08:52 AM.
Last edited by howie; Apr 28, 2008 at 10:11 AM.

Funny how small a world it is
Ray,velvet,and I all chiming in and all within 40 miles of eachother
Last edited by ohlord; Apr 28, 2008 at 10:11 AM.

Funny how small a world it is
Ray,velvet,and I all chiming in and all within 40 miles of eachother

thanks to all the local techs guessing at the issues. I would have thrown hundreds of dollars at this problem to no avail!!!BTW I have a pair of good as new 285/35/20 tires for sale
Last edited by howie; Apr 28, 2008 at 10:18 AM.
tire/wheel fitment
my favorite...
http://www.miata.net/garage/tirecalc.html
good one showing side fits...
http://www.1010tires.com/WheelOffsetCalculator.asp
another good one..for MBs, showing reasonable fitments...
http://www.alloywheelsdirect.net/inf.../mercedes-benz
those websites are crazy!!! Great info there
based on the MB site I guess I should have done 235 35 & 265 30
Last edited by howie; Apr 29, 2008 at 12:52 AM.






