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      04-08-2019, 03:03 PM   #1
Angry3
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Any issues with a 225/245 tire setup?

Mostly based on availability. The "BMW Star" Michelin PSS from the M2 is only available in those sizes, and from what I can tell, they don't make a PS4S in the 215 front width.

They do have a few 215 width PSS left on closeout, so that's an option as well.

Don't want to risk a 255 rear after the account of rubbing with that width in a PS4S.

Any guidance appreciated. Have a bubble in a RFT and need to get something on order stat.

Thanks!
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      04-12-2019, 12:21 PM   #2
asbrr
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main thing is the overall diameter between the 225 front and 245 rear won't match, so you should get a 215 front ideally. Wether or not it has a material effect on the car I"m not sure - it may mess with the ABS / DSC calculations a bit, but don't know if the differences are negligible.
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      04-12-2019, 07:32 PM   #3
zx10guy
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None. I've been running this very setup for about 3 years now since dumping the run craps.

I've also run 225/40 18s all the way around for my WS80 winter tires. Have run this setup since buying the car new.
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      04-12-2019, 09:30 PM   #4
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^^ I agree

215 or 225/40r18 front
245 or 255/35r18 rear
rim width and offset makes a difference would need to know those too to properly advise
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      04-24-2019, 02:25 PM   #5
Angry3
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Thanks all!

I misspoke on the Star BMW PSS available, they're OEM on the M235/40, the M2 obviously has much meatier rubber.

I took the plunge already with a set of 225/245 PS4S, but they haven't been mounted yet so I'm still in a position to do an exchange for a 255/35/18 for the rear (Which are produced and in stock).

FWIW the car is an '08 135 that's completely stock suspension wise, with the original style 264 wheels. That tire is likely overkill for the use it gets, being a 2nd car that's purely street driven, but I wanted something on the car that wouldn't mask the steering feel and make it feel too soft as my previous foray into NON-RFTs did.

Besides, at $8xx for the set after rebate, those tires are still $600+ cheaper than a set of the OEM Run-flats.

I'm running stock power (For now, have been off the board a while and will eventually go to a tune of some sort, even the JB+ I had back in the day was a riot), so maximizing traction isn't a concern.

Thanks for the feedback, all is welcome and appreciated. The car hasn't been given much attention (54k original miles), and I'm trying to get the 2 major issues with it sorted (Bubbled RFT, possibly cracked front rim, and delaminated rear convertible top window).

Cheers all! 🍺
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      04-24-2019, 08:33 PM   #6
asbrr
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FWIW I'd pick the 255/35 rear, just so the OD matches the 225/40 front. With stock suspension and rims you won't have any rubbing issues.
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      04-24-2019, 09:13 PM   #7
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255/35/18 rear MPS4S will fit no problem. I use this on Style 261M wheels (Pretty sure they're the same offset as your wheels) and I'm also lowered but have no problems at all.

Curious where you read that a the 255 had rubbing? Maybe that person was running different wheel offsets or a spacer or something?
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      05-22-2019, 05:57 PM   #8
Angry3
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Quote:
Originally Posted by dtla1 View Post
255/35/18 rear MPS4S will fit no problem. I use this on Style 261M wheels (Pretty sure they're the same offset as your wheels) and I'm also lowered but have no problems at all.

Curious where you read that a the 255 had rubbing? Maybe that person was running different wheel offsets or a spacer or something?
It's a thread on the next page, though it appears the OP there was running the Sport 4, not the 4S for what that's worth.

I went ahead and mounted them. I figure the rears will be toast well before the fronts, and will go 255 next time. That size certainly LOOKS like it will fit with no issues, though these tires clearly run a little wider than the OEM RFTS...

Amazing that a very good 3-season tire rides so much softer than the OEMs. Will have to experiment with tire PSI to see if that helps a bit. On the plus side, they should be easier on the wheels. No cracks, but in ~12K miles of driving over 5 years they sent enough shock to the wheels to put small bends in 3 of 4, this after 3 cracked and replaced wheels in years 1-4.

Happy with how things turned out. Thanks all.
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      05-26-2019, 09:22 AM   #9
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Don't want to hijack thread, but I'm not allowed to make a new thread as I am a new member. I have a similar car and just wanted some advice on tires for the 2008 135i coupe with 63k km I just bought. The tires are not down to the wear bars but the rears are breaking loose sometimes on hard straight line acceleration. They have date codes in 2011 and 2012, but there's no sidewall cracking. The usual advice is to replace tires around 7 years but I am not sure if that advice applies mainly to places with a lot of heat like Texas and Arizona (I am in Canada).

In case I should think about replacement, I got quotes for the following tires, and I am wondering if those sizes are suitable. I will only drive it on the street. I do not want any unpredictable effects like snap oversteer. Any advice as to size or brand is appreciated.

All tires 225/40/18 & 255/35/18. The pictured PSS tires currently on the rear are 255 and there is no sign of rub, not sure if PS4S is same dimensions.

1) PS4S $1300 minus $70 rebate = $1230. No tax (*) because supplier is on an Indian reserve.
2) PS4, which is actually what I want, not available. Not sure if that is this particular supplier, or whether those tires not sold in Canada.
3) Continental ExtremeContact Sport $1200 minus $65 Mail-in Rebate = $1135. No tax.

I may fit 1M upper control arms and coilovers in the front and rear at some point.

* - I have to mail a cheque to the government afterward for the tax. I will get right on that.


Current front wheel:




Current rear wheel:



Last edited by mrCanoehead; 05-26-2019 at 10:16 AM..
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