I don't understand wheel/tyre fittings... - Mercedes Benz SLK Forum

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

 
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#1 Old 10-28-2013
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I don't understand wheel/tyre fittings...

Believe it or not I have done a search to find the answers but they don't make a lot of sense to me and rather than risk getting it wrong I am hoping you guys will take pity on me and help me understand the above.

I have a 280 SLK R171 and it has standard wheels/tyres fitted, believe it or not I am quite happy with the sizes etc but I would like to buy a cheap set of wheels probably from a certain auction site and fit winter tyres on that cheaper set of wheels.

I understand I have 16" x 7" on the front and 16" x 8" on the back with an offset of 34 on the front and 30 on the back, I don't really understand what that means but assume its required to avoid damaging anything rubbing on the bodywork etc and obviously fit over the brakes.

I haven't really found many wheels I like in the MB range so wondered if there were any from the BMW/Audi/VW/Porsche range that might fit, and thats where I am stuck, since I don't understand the above numbers I have no chance of choosing a wheel that will fit my SLK properly without someone's help.

If you could just tell me of some car models that will have suitable wheels then I could search for them and see if there are any wheels I like (there are a set of Boxster wheels I've seen I would love but don't know if they would fit so its pointless buying them) anyway sorry for the long post and hoping there is someone that can tell me what I need to know out there.
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#2 Old 10-28-2013
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I don't know about the European versions, but my 2007 350 is running 17" rims (MB Stock). My tires are 225/45/17's in the front and 245/40/17's in the back. I assume tirerack.com can give you a clue on size and tires. I'm going to switch out to Michelin Pilot Super Sports fairly soon.
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#3 Old 10-29-2013
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if your changing to another manufacturers wheel you also need to consider centre bore size no good getting stud pattern et and offset correct and have 10mm larger (or smaller) centre bore .you might be better of if its just a winter set your after to buy another set of 171 wheels or go cheap aftermarket
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#4 Old 10-29-2013
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If I recall correctly, the handbook specifies the same width rims front and rear for winter tyres....

That said, I considered putting winter tyres on my standard rims and then get something else for summer use. Never got around to doing that of course. I must be a tyre-kicker...
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#5 Old 10-29-2013
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It doesn't sound too good so far, its the rims i am worried about and I hadn't even thought about the centre bore size so already this thread is paying dividends even though nobody has come up with any alternative wheels that might fit.

I am beginning to wish I hadn't seen the porsche wheels because they are exactly what I was looking for, my car only has the standard 16" wheels and so were the porsche but with my luck they wouldnt fit so I'd be wasting my money.
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#6 Old 10-29-2013
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Have a look on THIS site - all genuine MB wheels, great prices and good people to do business with. Some of our American members have bought their wheels from them.

There's a great choice, and they also stock Porsche wheels, so they should be able to advise you if your chosen Boxster wheels will fit.






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#7 Old 10-29-2013
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I have done considerable research for my 16" rims to upgrade them. I was flooded and drowned in information regarding staggered front and rear tire sizes, then rim information. I had purchased new tires as soon as I bought the car, but that was my first mistake. I *should* have bought 17" rims and tires out the gate, but then in my research post tire purchase, I realized that the bore size came into play, yet I had no idea what it was. Between tirerack.com, discounttire.com and carid.com I realized what 16" size rims I should be looking for, OR at a minimum what 17" rims and tires I should be looking for to make sure the bore fits.

Carid.com [one of our sponsors coincidentally] has the BEST selection of 16" rims.
17" look good of course, it depends on the money you want to spend. But regardles of your porsche rims, im positive you'll find a suitable or more acceptible alternative there. Im obsessed with rim shopping and have been for the last 3 months. I've changed my mind about 6 times since, as more information is learned. I've gone through just about every rim website there is, searching tirelessly for black and red rims, red rims, black rims and every composite inbetween.

Good luck


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#8 Old 10-29-2013
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Thanks for the words of wisdom slk320chick as I said the porsche rims just happen to appeal to me and they are REALLY really cheap!

I've looked up as many details as I can find regarding them and all I have found is they are from the porsche Boxster 986 model below:

Boxster 986
Size / offset / tyre -----Size / offset / tyre--------- Make
16x6-- 50 --205/55R16 16x7-- 40 -- 225/50R16 Porsche
MB R171 280SLK
16x7-- 37 --205/55R16 16x8-- 30 -- 225/50R16 M/B

So the Porsche wheels are slightly smaller but tyres are the same hmmmm I wonder I so like those wheels and as I said they are (currently) very very cheap
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#9 Old 10-29-2013
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Originally Posted by Rebel View Post
Thanks for the words of wisdom slk320chick as I said the porsche rims just happen to appeal to me and they are REALLY really cheap!

I've looked up as many details as I can find regarding them and all I have found is they are from the porsche Boxster 986 model below:

Boxster 986
Size / offset / tyre -----Size / offset / tyre--------- Make
16x6-- 50 --205/55R16 16x7-- 40 -- 225/50R16 Porsche
MB R171 280SLK
16x7-- 37 --205/55R16 16x8-- 30 -- 225/50R16 M/B

So the Porsche wheels are slightly smaller but tyres are the same hmmmm I wonder I so like those wheels and as I said they are (currently) very very cheap
You need to find out the bolt pattern for the wheels. The SLK 171 uses a 5-112. Porsche many time uses a 5-130 or 5-108. The bolt pattern is different so the Porsche will not fit. Check this site for more info. http://carboltpattern.com/


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#10 Old 10-30-2013
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Many thanks Gbarringer100 that was the information I needed!

I have phoned a couple of companies today and found I can get converters but the Porsche wheels are not the ideal candidates unfortunately so it was recommended I forget all about them.

It seems if I get the wheels with a 5x112 the hub isn't quite such a big problem as I should be able to get a spigot ring to make the hub fitting work and it seems the offset also isn't quite the problem I had assumed the existing wheels are only 16" and I am not worried about getting larger wheels so there is quite a lot of room to play with and if necessary I can get spacers or something to bring them closer to the offset Mercedes use on the R171 SLK (offset 34 front 30 rear), the larger the offset as I understand it the closer to the suspension the wheel sits, the smaller the offset the closer to the edge of the wheel arch.

Hopefully I have that right if so an extra plus or minus 10 should make 1cm difference and the wheel arch is plenty big enough to accept that without fouling anything (as far as I am aware, if however I am wrong I can always fit a spacer to bring the wheel outward and make up for at least plus 10 in the offset.
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#11 Old 10-31-2013
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Here is a good site for comparing wheel and tire sizes. Put your size is the first selection then put in what you might want in the second selection. Check the height of the tire you need to keep in near the EOM and the difference between front and back must be less than 3%.

http://www.rimsntires.com/specs.jsp


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