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      05-13-2012, 05:02 AM   #1
A_P
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275/40/19 rears

Hey guys,

I was wondering if I could pick a few brains. Currently I am running 275/30/19 Continentals on the rears. I have no rubbing issues and the car runs sweet. I was just wondering.

If I change to a set of 275/40/19 at the back would this drastically affect ride?

I.e comfort? speedometer accuracy etc?

Car is: E90 330i M Sport
Any help would be greatly appreciated.

Regards.
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      05-13-2012, 05:34 AM   #2
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I'd be very surprised if that fits. Stock tyre is 255/30, so sidewall height is 76.5mm. A 275/40 would have a sidewall height of 110mm, so I'd expect it to rub a lot. You can use the calculator on the forum to check details: http://www.e90post.com/forums/forumdisplay.php?f=12
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      05-13-2012, 08:31 AM   #3
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Quote:
Originally Posted by seanblee View Post
I'd be very surprised if that fits. Stock tyre is 255/30, so sidewall height is 76.5mm. A 275/40 would have a sidewall height of 110mm, so I'd expect it to rub a lot. You can use the calculator on the forum to check details: http://www.e90post.com/forums/forumdisplay.php?f=12
Thanks for that link Sean. Yea currently im running aftermarket wheels, ran 265/30/19 last year and it was good but not as good as the 275/30/19. I havent noticed any problems in rain or aquaplanning. Just was wondering if the 40 height would give a more comfortable ride.
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      05-13-2012, 09:17 AM   #4
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A 40 profile would definitely make the tyre more compliant, but I think you'd have big clearance issues, and it would also throw the speedo off.
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      05-13-2012, 09:29 AM   #5
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Originally Posted by seanblee View Post
A 40 profile would definitely make the tyre more compliant, but I think you'd have big clearance issues, and it would also throw the speedo off.
According to the chart you sent me a link too it would be out be 1.5mph. But agree on the clearance issue. Hmmmm decisions... decisions. Are you running the stock set up?
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      05-13-2012, 09:36 AM   #6
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Quote:
Originally Posted by Awfully_Polite View Post
According to the chart you sent me a link too it would be out be 1.5mph. But agree on the clearance issue. Hmmmm decisions... decisions. Are you running the stock set up?
I make it out by 6mph at 60mph on the calculator. Stock size is 255/30 R19, so at 275/40 R19 you're over on diameter by 9.5%.
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      05-13-2012, 09:43 AM   #7
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Originally Posted by seanblee View Post
I make it out by 6mph at 60mph on the calculator. Stock size is 255/30 R19, so at 275/40 R19 you're over on diameter by 9.5%.
I see. I also see that if i compare my current set up to the new set up then it says it will be exactly the same lol.

138 views and no further responses?

Cheers for your help Sean, If I do it then I will be sure to let you know. Good or Bad.
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      05-13-2012, 09:47 AM   #8
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Quote:
Originally Posted by Awfully_Polite View Post
I see. I also see that if i compare my current set up to the new set up then it says it will be exactly the same lol.
Sorry mate, not with you. The three screen shots below show your size compared to stock, your proposed size compared to stock and your proposed size compared to your current size... Good luck if you decide to go ahead!
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      05-13-2012, 11:39 AM   #9
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Hey, its not a problem if you switch to those tyres. I will put 285/40/19s on the rears with no problems It will accelerate faster I suppose
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      05-13-2012, 12:26 PM   #10
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You certainly wouldn't get away with it on the E92 AP.

There is certainly more room in the arches of the E90 to that of the E92,I doubt that room would accommodate a 40 profile.

I'm with Sean,I think it would rub,and rub badly.
It will cost a lot to find out,and a right f*cker if you get it wrong.
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      05-13-2012, 12:27 PM   #11
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You're effectively raising the gearing, so it will accelerate slower but have a higher top speed.
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      05-14-2012, 12:29 AM   #12
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Quote:
Originally Posted by Hotcoupe View Post
You certainly wouldn't get away with it on the E92 AP.

There is certainly more room in the arches of the E90 to that of the E92,I doubt that room would accommodate a 40 profile.

I'm with Sean,I think it would rub,and rub badly.
It will cost a lot to find out,and a right f*cker if you get it wrong.
Yea all valid points Hotcoupe, Is this kind of reasoning which I started the thread. I wanted to gauge what others think and or have done. I have attached home pics of the current set up on 275/30/19.

My offset is not aggresive, The set up was more for personal pleasure rather than stance and looks. But as you are running 275 too, I would like to know your thoughts.

Cheers.
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      05-14-2012, 12:30 AM   #13
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Quote:
Originally Posted by seanblee View Post
You're effectively raising the gearing, so it will accelerate slower but have a higher top speed.
Ok I did not consider this, Is this 100% correct? Looks like I will need to read up some more. Cheers Sean.
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      05-14-2012, 12:32 AM   #14
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Hey, its not a problem if you switch to those tyres. I will put 285/40/19s on the rears with no problems It will accelerate faster I suppose
Get out 285! lol You are kidding right? If you do it, post up some pics I would be very interested to see how that looks, Also I mini write up of how it handles would be nice too.
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      05-14-2012, 12:36 AM   #15
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Ok so some pics of the current set up. 275/30/19
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      05-14-2012, 03:58 AM   #16
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Quote:
Originally Posted by Awfully_Polite View Post
Yea all valid points Hotcoupe, Is this kind of reasoning which I started the thread. I wanted to gauge what others think and or have done. I have attached home pics of the current set up on 275/30/19.

My offset is not aggresive, The set up was more for personal pleasure rather than stance and looks. But as you are running 275 too, I would like to know your thoughts.

Cheers.
In truth AP I'm slightly offended.You ask for advice and have the temerity to post pics of a filthy car.
What the f*ck is that all about

Anyway on a serious note a couple of queries:

What are the offsets of the wheels?
What width are the wheels?
What size wheels/ tyres are you running on the front?

It's a bit difficult to do any meaningful comparisons,my cars the E92,yours the E90.
I'm far from an expert on what works/doesn't work on the E90,whilst with my E92 I have a few sets of wheels with differing offsets/tyre sizes (correct profiles) and umpteen spacer sets to allow me to dabble,but we'll give it a bash.

From an expensive experience,a 35 profile on the rear of a E92 rubs, and that was on a standard 255 tyre.

You've talked about changing the profile of the rear tyres,but not mentioned the fronts.
Have you considered the impact to the handling characteristics of the car by just changing the specs of the rear tyres?

You are more than welcome to try the following:

Take 2 of my front MSport 225 (MV4) wheels.
Offset ET37,tyres -Rockstones size 225/35/19

We could spacer them out to match the wheels you currently have on the rears and stick them on.
If a 35 profile rubs on the rear of your E90 (which I suspect it will), you have answered the question and you've saved a few bob,it it doesn't rub,we can try something else to determine if it will.

Over to you Fella
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      05-14-2012, 05:18 AM   #17
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Quote:
Originally Posted by Hotcoupe View Post
In truth AP I'm slightly offended.You ask for advice and have the temerity to post pics of a filthy car.
What the f*ck is that all about

Anyway on a serious note a couple of queries:

What are the offsets of the wheels?
What width are the wheels?
What size wheels/ tyres are you running on the front?

:
Hahaha, oh dear apologies. Hahaha. Truth be told, Its dirty, proper filthy ( exterior only) for around 6 months a year and then super clean, polished swirl free for the other 6.... Its always been this way with all my cars... dont know why!?

Ok. so orginally when I bought the car from Farnborough BM it was running standard M Sport MV3 18" bridgestone, 225 40 18 front and 255 35 18 back.

So I took them off and they are still stored in the garage with the stock tires. I then installed a set of Cades Apollo about 3 and half years ago, which are 8.5 front wearing 235/35/19 and then 9.5 rears wearing 265/30/19. I believe the ET is either 35 or 45 but I dont really know for sure. The ride was good and all the usual everyone has said about the 265 rears.

Until... last year I ran the 275 at the back ( same 235/35/19 up front) This, subjectively, was a huge leap forward in terms of driving pleasure for me, The car was much more planted than the year before and ran heavier but more sure footedly, on the limit it was much more progressive and predictable.

A close friend of mine had an S3 and a nice private road, From a standing start, he pulled away first and opened a lead which levelled out to a 2 car length gap at around 70mph, and then I began to reel him in. ( this was running the 265 rears)

We did this again around Jan time this year, when I was running the 275 rears and traction was much better this time and we were practically level at 60 and i edged ahead at 80.

So the point of it all, is that If the 275/30/19 can fit and run without any problems thus far, and in my opinion improve traction and handling then should I go the step further and try running the 275 with a 40 height to assertain wether or not there would be any further gains in comfort and/or enjoyment to be had?

As a sort of test bed if you will. Its strange because no one it seems as done something like this before? Over the pond in the States it seems they are more into running 19 or 20 inch rims with huge drops and stretched tires, and over here ppl seem to be satisfied with their 265 rears.

Thanks for the offer Hotcoupe that is very generous of you, but I will decline on the grounds that I have pretty been sold on idea of getting the tires and trying it, unless someone or my self can find some evidence of this being a really bad idea.
If for whatever reason you need a hand with anything in the future if me a shout.

Lastly, I do not promote any kind of erratic or stupid behaviour on public roads. I have no points and have a clean license. Anyone who likes a good race then take it to a track or the sort.

The s3 comparison is not an accurate test and he no longer has it as he swapped for an orange TTS ( tell me about it)

Safe driving Guys and Girls.


Last edited by A_P; 05-14-2012 at 05:25 AM.
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      05-14-2012, 06:18 AM   #18
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Originally Posted by Awfully_Polite View Post
I then installed a set of Cades Apollo about 3 and half years ago, which are 8.5 front wearing 235/35/19 and then 9.5 rears wearing 265/30/19. I believe the ET is either 35 or 45 but I dont really know for sure.
Looking at the pics and the position of the wheel - arch,I'd say they were ET35,ET45 would have them sat much further into the arch.

Quote:
Originally Posted by Awfully_Polite View Post
So the point of it all, is that If the 275/30/19 can fit and run without any problems thus far, and in my opinion improve traction and handling then should I go the step further and try running the 275 with a 40 height to assertain wether or not there would be any further gains in comfort and/or enjoyment to be had?
Well a 40 profile will do nothing for traction,it should however give more comfort as you'll have more of a 'bed' for the car to sit on.

If we leave the huge potential risk of rubbing to one side,I can't help thinking that increasing the rear profile will possibly unbalance the car,with an impact on handling which will of course upset your enjoyment.

Sometimes you just have to try these things though,good luck
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      05-14-2012, 06:57 AM   #19
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It might be stupid question, but wouldn't 275/35/19 be a better option for you? 275/35 has more chance to work than 275/40.

On a side note, were the 265 and 275s you had previously the same brand and type?
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      05-14-2012, 07:13 AM   #20
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It might be stupid question, but wouldn't 275/35/19 be a better option for you? 275/35 has more chance to work than 275/40.

On a side note, were the 265 and 275s you had previously the same brand and type?
Hey Idnan,

Yea, I will consider when I go pick them up this weekend, It will either be 275, 30, 35 or 40.

The first set were Cooper Avon ZZ3, then had the Pirrelli P Zeros. both at 265. Then and currently 275 Conti Sport 5P. This weekend planning to change back to P Zero at 275.

HotCoupe I will post up pics ( hopefully clean ones) of when its done. Good or bad.
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      05-14-2012, 07:38 AM   #21
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Please forget about 275/40/19, those are way to big for e90.
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      05-14-2012, 07:50 AM   #22
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Please forget about 275/40/19, those are way to big for e90.
I will think about it. How are you finding the ride on 20 inch wheels? What tires are you running by the way?
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