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The Tire Rack's Tire & Wheel Forum
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Old 12-25-2009, 11:30 PM   #1
///Miller325ci
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Exclamation GARY: Tire SIZE Question about the BMW Style 195's

OK so I have been searching for a while but I cant find the answer so im going to ask... my car came with 225/45/17's all around I know that as an option i can mount a 245/40/17 on the car in the rear... and since i know or at least... im pretty sure that the rims are the same sizes on all four corners...

My Question can I fit a 245/45/17 on all 4 corners on the stock 17X8 rim at least I am pretty sure they are 17X8.... and does it make sense to do a 245/45/17 or is there negative side affects i want to increase my contact patch to the ground on all 4 corners so that i can easily rotate them and at the same time have a square setup which has less understeer than running a staggered setup

oh yes i do romp on it pretty hard and often so im not going for the larger contact patch for just looks haha =]

Last edited by ///Miller325ci; 12-25-2009 at 11:36 PM.
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Old 12-26-2009, 05:16 PM   #2
///Miller325ci
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funny how its been viewed 45 times and nobody has answered

Last edited by ///Miller325ci; 12-26-2009 at 05:18 PM.
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Old 12-26-2009, 05:26 PM   #3
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You may want to consider 245/40/17s. 245/45 will be too tall. And yes, 245s will fit on an 8" rim just fine.
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Old 12-26-2009, 06:00 PM   #4
///Miller325ci
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humm sounds like a good idea then... so ill probably affect my speedometer a little though right? um the 245/45's would rub ya think?
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Old 12-26-2009, 10:00 PM   #5
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depending on the offset of the wheels and how much you have lowered the car, you will probably rub with a 245/45
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Old 12-28-2009, 04:50 AM   #6
///Miller325ci
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well right now im stock ride height on sport suspension haha for now
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Old 12-28-2009, 07:36 AM   #7
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245/45R17 will likely rub, but 235/45R17 works in most cases with no problem.
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Old 12-29-2009, 03:16 PM   #8
///Miller325ci
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hummm that might be the answer! haha didn't think of that
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Old 01-06-2010, 05:18 PM   #9
///Miller325ci
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i do have another question haha if got those 235s do you think that they would last longer than a 225...my thoughts were that since i would be putting a little bit more rubber down on the road the tires would have to work less hard to maintain traction the same level of traction as with a smaller width tire.... because i figured that with a larger tread width the heat that the tires generate would be diffused over a greater area making the the heat spread out more instead of being more focused over a smaller area of tread... keep in mind i typically get tires around 200-220 treadwear and get about 8000-9000 miles from them
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Old 01-06-2010, 06:01 PM   #10
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Quote:
Originally Posted by ///Miller325ci View Post
i do have another question haha if got those 235s do you think that they would last longer than a 225...my thoughts were that since i would be putting a little bit more rubber down on the road the tires would have to work less hard to maintain traction the same level of traction as with a smaller width tire.... because i figured that with a larger tread width the heat that the tires generate would be diffused over a greater area making the the heat spread out more instead of being more focused over a smaller area of tread... keep in mind i typically get tires around 200-220 treadwear and get about 8000-9000 miles from them
Uh, no. Wear will be the same. Think of it this way, you are subjecting an additional 10mm (nominal) of the same compound to the same kind of use/heat/wear as the other 225mm (nominal). Its just a wider version of what you already have. The only "gain" will be a very slight increase in grip (longitudinally and laterally) that you most likely will not notice.
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Old 01-06-2010, 07:00 PM   #11
///Miller325ci
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hummm interesting well if u think about it in terms of brakes.... smaller rotors usually means that it will heat up faster and be more prone to fade... larger rotors the heat transfer is over a larger area which allows the heat move around more and cool off quicker... which is why i was thinking tire wear might be related to how much u heat them up... to some extent... my thoughts are that if this is true with brakes then tires would work in a similar way... the heat would have more room to transfer around and cool... keeping the tires cooler... ? maybe the effect would be greater over a more drastic change in tire width...
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Old 01-07-2010, 05:15 PM   #12
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Apples and oranges comparison with brakes, but I see your point. I believe heat and subsequent wear vs. width is more linear in regards to tires.
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Old 01-07-2010, 05:41 PM   #13
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All other things being equal, increasing the width of the tire only changes the shape of the contact patch not its area.
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Old 01-10-2010, 05:34 AM   #14
///Miller325ci
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ah yeah i see haha good call haha anyone know a good place to buy bbs RGR rims that are 17x8 that aren't ridiculously expensive haha
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Old 04-13-2010, 02:38 AM   #15
///Miller325ci
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I actually ended up going with a 245/40/17 on all for corners... =] its a pretty good set up =] but since im currently running a 17x8... i am wondering if i went to a 17x9 going from the stock ET47 offset to a BBS RGR in 17*9 on all four corners at a ET42 if I will be able to fit without rubbing... I know that dinan fits a 19x9 on all four corners running a 245/35/19 however i don't know their offsets.... and from what i know... it doesn't rub on their suspension kit which i am getting put on any day know =]
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