Another 18" Wheel/Tire thread - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

 
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#1 Old 10-20-2013
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Another 18" Wheel/Tire thread

I'm researching the purchase of new wheels and tires for my SLK55. The originals on the car are in fine shape, but feel undersized. I want to reduce the unsprung weight, while gaining additional contact with the road. I'm biasing the traction to the rear slightly. Based on all the threads, and user experience I'm considering the following.

Front 8.5x18 (32mm offset) with 245/35-18 Pilot SuperSports
Rear 9.5x18 (40mm offset) with 265/35-18 Pilot SuperSports

This is based on the following information:

MarkR171
Front: 18x8 ET35 Enkei PF01 with Hankook Z214 C71(Soft) 245/35/18
Rear: 18x9 ET35 Enkei PF01 with Hankook Z214 C91(VerySoft) 275/35/18

PropDr
A 8.5” front wheel with an offset of 30mm will just fit under the fender; the dish and hub design determents if it fits over the brakes. You be better of with 33 to 35mm
A 9.5” rear wheel will stick out with an offset of only 35mm, to stay within the fender you need about 38-40mm.



My only concern is the Section Width on the fronts which is larger than either MarkR171's or PropDr, by 5mm. Any input would be appreciated.

Thoughts?
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#2 Old 10-20-2013
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If I remember my convo with propdr, he had to remove the pigears from his rears so they would not rub.


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#3 Old 10-20-2013
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Thinking the 235/4-18 a safer bet on the front. The section width of 9.5 versus 9.8

235/40ZR18
weight 23 lbs.
Rim 8.5"
Section width 9.5"
Thread width 8.5"
Diameter 25.4"
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#4 Old 10-21-2013
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My 265/35/18 ET35 in the rear (on 9.5) .

I've got 235/40 ET35 in the front (on 8.0), no problems.

No lowering of any kind.
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#5 Old 10-24-2013
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Anybody else running 8.5x18 ET 30 on all four?

I'm seriously considering going for the stock 16 spoke rears, in the front. It would preserve the stock look, while providing the much needed addition width in front. They aren't the lightest at 25.6lbs, over the original 24.4lbs, but are lighter that the 030 fronts.

I know PropDr tried this on his, without any rubbing, with stock 245/35-18s. It would be a stealthy upgrade. Tire wise, I'd still do the Pilot SuperSports.

235/40-18 front (or save a pound in weight and do the 245/35-18)
255/35-18 rear

Thoughts? Anybody else running 8.5x18 ET 30? If what size tires are you running?
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#6 Old 11-01-2013
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I'm going for the stock look. Going with four rear wheels used all around.

235/40-18 Michelin Pilot Super Sport front, on stock 8.5x18 et30
255/35-18 Michelin Pilot Super Sport rear, on stock 8.5x18 et30

This will give me just a little more bite, and help fill out the wheel wells a little. Still think the 255 are small (coming from the 305's on the 997TT) but I don't want to upset the balance and induce more understeer.

I'll post the before and afters once all the parts arrives, and are installed. I'm replacing all the TPMS sensors while I have it apart. On my previous cars 7 years was the max before the non-replaceable battery started to go.
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#7 Old 11-07-2013
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Well my 8.5x18 stock rears arrived and I mounted them on the front with 235/40-18 Pilot Super Sports. Mission accomplished. Note able improvement in the look and better grip in front. Previously. The fronts were buried in the wheel wells. Now they are flush with with edge and look as it should have front the start.
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#8 Old 11-07-2013
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Another view

Very happy with the outcome. Now just waiting on the rear 255/35-18 to arrive.
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