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  1. #1
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    Getting rid of runflat tires

    Less than five thousand miles into ownership of my 135i the rear tires are nearly smooth so it's time to think about replacements. I went to non runflat tires on my last BMW and it was definitely the right move but I got three flat tires (nails every time) and it was a pain to not have a jack so I want to know if any of you have a jack you keep in your car. What's a good one that will work with the E82? I also need a good tire plugging kit.

    While we're on the subject, what did you replace the runflats with? I'm thinking Yokohama S.Drive or Continental ExtremeContact DWs, doesn't look like there are too many choices in 135i Sport sizes.

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    What are the 135i sport sizes?

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    215/40-18 and 245/35-18

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    Click here to enlarge Originally Posted by Remonster Click here to enlarge
    215/40-18 and 245/35-18
    If you go to a 225/40/18 in front you have plenty of options, actually a ton.

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    Do you know if 215 is the optimal size for the stock rim (not sure of its width)? I guess what I'm asking is will a 225 tire be ballooned / less stretched or is the 215 slightly stretched? It looks like the stock 215 sits on there pretty naturally.

    If I go 225 should I also increase the rear to 255? I'd like to decrease the understeer as much as possible but I also have serious grip issues with the JB3.

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    Click here to enlarge Originally Posted by Remonster Click here to enlarge
    Do you know if 215 is the optimal size for the stock rim (not sure of its width)? I guess what I'm asking is will a 225 tire be ballooned / less stretched or is the 215 slightly stretched? It looks like the stock 215 sits on there pretty naturally.
    You should be fine with a 225, 10mm won't really be pushing it and some tires run smaller or larger than other anyway.

    Click here to enlarge Originally Posted by Remonster Click here to enlarge
    If I go 225 should I also increase the rear to 255? I'd like to decrease the understeer as much as possible but I also have serious grip issues with the JB3.
    That is up to you, you don't have to. I like as much tire as I can get.

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    Did you already replace the wheels?
    And does anyone know if 225 and 255 width tires will fit under a 135i coupe?
    The original size 215 and 245 is already pretty tightly fit to the fenders.
    Has anyone been able to fit wider tires under a 135i coupe without bodywork changes?
    I need to replace my stock Bridgestone Potenza RE05A's soon and I would hate it if the size of these tires would force me to go for the same tires. I'm so tired of the lack of traction with these tires in wet conditions... But there are not too many alternatives with the stock size.

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    I've noticed the factory tires tend to run a little undersize compared to others. I don't see why you can't fit 255s in the rear. A slight fender roll might needed as a worst case scenario.

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    Click here to enlarge Originally Posted by Matt@Camber-Toe Click here to enlarge
    I've noticed the factory tires tend to run a little undersize compared to others. I don't see why you can't fit 255s in the rear. A slight fender roll might needed as a worst case scenario.
    Exactly, and some brands run wider and skinnier, a 255 should not be a killer.

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    I know the old Falken 451s were seriously undersized. I dont know what kind of measuring system they used, but it got worse as the size increased. A 305/30/19 was the same size as any other 275/30/19.

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    You will be fine going +1 front and rear

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    Tanx for the advice guys. I will be switching my rear tires after the winter for Michelin PS2 255/35/18. The Bridgestone RE050A's are pretty much gone. But first the switch to 205's for the winter. Remarkable though, they lasted for 17000 km (10500 miles). Must be due to the traction control...

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    There is that BMW Tire repair kit for those of us whom have switched from the RFTs.

    I noticed my car doesn't handle as rigidly as it did w/ the RFTs, but the ride is smoother....drop in MPGs though.

    I'm running the Conti ExtremeContacts DWS on my 19"s
    Fronts:235/35ZR19
    Rears:275/30ZR19

    My RFTs lasted for about 18k...drove the sh*t outta them!

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    The BMW repair kit will make sure you get home with a puncture. Once applied, the tire is only good for getting home once, and needs to be replaced due to weightdifference/inbalance.
    The repairkit doesn't work at all when you damage the sidewall of the tire.

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