Square Setup: 245/40/18 +40 Possible? - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 09-30-2015
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Square Setup: 245/40/18 +40 Possible?

I just ordered a set of Vogtland springs and am now considering wheel setups. I know the rears will fit, but has anyone ever gone that wide on the front successfully? I would like to be able to rotate tires without giving up rear width.
Thanks Guys.
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#2 Old 09-30-2015
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It will be touch and go with the +40 - but I have not done it, this is just a feel.
Mind you, you might be able to space out the offset. Would your tyre supplier maybe have an old tyre that could be fitted as a sample?
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#3 Old 09-30-2015
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I run 245/35/18 in front. 245/40/18 is taller than 225/40/18. I also run 275/35/18 in the rear.

(18x8 ET35 front, 18x9 ET35 rear)

Fitment is perfect and I am lowered on coilovers around an inch lower than P30 packaged SLK55. I have a feeling ET40 with 245/40/18 would rub in front.

Sold: '07 SLK280 | 18" TSW Bremmas | Toyo T1-R 225F/245R | SmartTop V.3 | Green Filters
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#4 Old 09-30-2015
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Here's a picture of the 245/35/18 front and 275/35/18 rear

Sold: '07 SLK280 | 18" TSW Bremmas | Toyo T1-R 225F/245R | SmartTop V.3 | Green Filters
Sold: '07 SLK55 AMG | 030 Package | Custom X-Pipe | Secondary Cat Delete | SmartTop V3.33 | Mod R170 Antenna | BC Racing Coilovers | Racingbrake Two-Piece Rotors | Enkei Pf-01, Michelin Super Sport 245F/275R

Current: '15 Alfa Romeo 4C | Black on Red | Track Package
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#5 Old 09-30-2015
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Thanks all for the swift info.
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#6 Old 10-13-2015
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Update!

I've decided to experiment with a more aggressive setup.

Front is looking like a 255/35/R18 (9.5+30) Before: 225/45/R17 (7.5+37)
And Rear is Looking like a 255/35/R18 (9.5+28) Before: 245/45/R17 (8.5+30)

I'll Leave some diagrams of the changes down below.
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File Type: jpg Front Setup.jpg (42.7 KB, 34 views)
File Type: jpg Rear Setup.jpg (44.3 KB, 21 views)
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#7 Old 10-13-2015
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9.5" in the front is possible, not sure with 255s though. Might rub like crazy. It will be interesting to see what you find out. You might need a lot of suspension bits to make this work. I think Arno ("Prop Dr") did a lot of similar work on his 55 years ago, and it was not simple.
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#8 Old 10-16-2015
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Quote:
Originally Posted by Durkatlon View Post
9.5" in the front is possible, not sure with 255s though. Might rub like crazy. It will be interesting to see what you find out. You might need a lot of suspension bits to make this work. I think Arno ("Prop Dr") did a lot of similar work on his 55 years ago, and it was not simple.

Thank you for the warning.
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