V12Godspeed

I bought some C55 rims and need to put tires on them. I was told I could get away putting 255's on the rear. Could someone help me in telling me what tires (size's) they are using in the front and rear. Appreciate the help.

PC Valkyrie

Stock tire sizes are 225/40 R18 front and 245/35 R18 rear. Keep in mind that the rear rims are wider than the front rims.

Yes, you can go up to 255/35 R18 in the rears with no problems. North44 has this setup in the summer.

V12Godspeed

Thanks, really appreciate the help! I will buy these tires then.

derrick_lui

I've heard that you can put 265's in the rears on C55 rims ..with ocasional rub..but not a big problem.

thats what Im planning to do next...right now I got 255 Toyos on the rears..they are great....265 would be more awesome!

AMG_55

u can run 235 on the front and 255 on the rear (dunno if 265 will fit)
i had the same width wheels o my E36 m3, i used 235fr and 255rr yoko a023r semi slicks

cntlaw

Few months back, I replaced the tires with PS/2 , keeping the front as 225 , and the the shop suggested 255 instead of 245 at the rear as they said, for 18" rim, 255 is more popular. At first, I worry wider tires mean worse ride quality, slower to launch and more fuel consumption. And, I was wrong.
The ride quality was not affected at all, there is a slight increase in harshness at the rear but the feel was positive.
The car actually can launch better with hard acceleration. I would guess the C55 just has more than enough torque for tires such as 255, 265.
And no, there has been no increase of fuel consumption that is noticable.
Go for it, you won't regret.

Now, I ask, is there any benefit to go for the 235 front instead of my 225 now?

ClayJ

I'll make it unanimous then - FR 235 RR 255
Nike!

FrankW

MB/AMG decides to put 245/35 to keep the overall diameter slightly smaller than C32's 17" setup for couple reasons. 1. slightly cheap tires. 2. the speedo will be more accurate.

AMG used to recommand 255/35 for people that are purchasing AMG wheels btw.

AMG_55

im running 275 rears (ps2) and can still easily smoke them w/o any power braking.

when i put 235 f. tires on i got a much better turn in response/grip, much better grip throughout the corner and the tendency of the car to understter was greatly reduced. i would recommend 235 fr. from my experience on numerous cars (m3, clk55, 124 E500)

cntlaw

Terrific ! Presumably, my stock 18" rims are really better to go with 235/255 Wonderful, since front tires usually wear out first, I will just replace the 225 front with 235 after another 10K km.

cntlaw

Thanks , that ease all my little worries.
BTW, since I replaced the rear from 245 to 255, (still 18" stock rims ); I noticed my trip meter showing 1.5km less than my usual home2office 25km trip , i.e. 23.5km. This puzzles me a bit, is it true that 255 tires makes the diameter of the rear bigger than 245 ?

V12Godspeed

I bought my tires and i am using 255-35 on the rear and 225-40 in the front. Man the car looks awesome and i noticed it handles better and accelerates better also.

timberman

moving to a 255 tyre on the rear will increase your rolling radius but only by a small amount...roughly 3/8 of an inch (8mm) and should make very little difference i.e when the speedo reads 60 mph you will actually be traveling at about 61 mph

cntlaw

What about the milege counter ? As I mentioned above , it used to be 25km journey and now always read 23.5km.

timberman

must admit i've never really considered this and i am also running 255 on the rear ... but your readings seem to be a bit off

according to my calculations the stock wheel rotates 815 times per mile (509.375 per km ) and with a 255 tyre this falls to 806 ( 503.75 per km ) so after 100 kms your tyres would have turned approx 560 times less than normal or a distance of roughly 1.1 kms so after 25 kms the difference should be just over 1/4 of a km less ....i think

i am no expert on this, so if anyone has a better understanding then please enlighten us because this would seem like a cunning way of keeping the milage down

TopGun32

235/255 is the way to go on 7.5/8.5 rims

i have the stock tires on these rims from the CLK55.

As soon as their done, I will upgrade to 235 and stay with 255 in the rear.

cntlaw

Very logical.
Okay, definitely a small reduction in the milege counter.
Now I need to verify whether it was because my increasing frequency of overtaking from the inner most lane on this mountain circle road - which reduces trip distance!