172 wheel change info needed - Mercedes Benz SLK Forum

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#1 Old 08-23-2015
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172 wheel change info needed

hi guys
i am looking to change my wheels over from the 18's to some nice 19's
according to the online cals i have some info but would prefer if some one had first hand knowledge ..

front wheel would be going from a 18" x 7.5" & et 42 to a 19" x 8.5"& et 34.5
according to the online calculators i would have 5mm less inner clearance and the wheel would extend out 21mm more ,,,

rear wheel would be going from 18" x 8.5 & et 38 to a 19" x 9.5" & et 48
again this would leave 23mm less inner clearance and extend out just 3mm more

anyone know if these wheels will fit as is ????????

tires would be going from
225/40/18 to 255/35/19 fronts
245/35/18 to 285/35/19 rears

cheers ...........
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#2 Old 08-23-2015
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you're going from 225 to 255 on the fronts? wow! you are brave and going against everything MB has tested for front wheels (handling/braking/ride)! WOW!!!


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#3 Old 08-23-2015
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Yep - you are way over on the tyres. With 255 on the front you are asking for all sorts of issues. If you want to see what they are, try using your present rear wheels on the fronts.

As narrow as possible is called for on fronts - stick with 225 and go 255 on the rear.

Now, with an ET of 48, on Cruize wheels, I am not sure. Their dish on the rear is quite deep. Ask the question of the seller and get the reply in writing.
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#4 Old 08-24-2015
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You are one sharp sailer!!

255 on 8.5 is about the max. the rim can handle.
285 would require 10.0 and you are planning on putting it on 9.5. WOW!

The measurements for the R172 are not much different than from the R171 apart from the ET values.

On the R171 245 on 18" on the fronts was considered the max that would fit without doing any bodywork. For the rear 275 on 18" was determined to be the max. with some occasional rubbing. Both required 'optimal' ET values and no lowering. And now you are taking it one step further with 19"...

If you can try to test these set ups first, they may try out to be a costly affair.
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