Successful F10 run flat replacement?

WillyWonka

Realise there a lot of threads on replacing BMW run flats but haven't seen any success stories for the F10.

520d MSport

Front: 245/45 x 18 (not a problem)
Rear: 275/40 x18 (seems to be a problem)

The problem is that there doesn't seem to be any nonRF options for 275/40 x18 rears. Apart from 1 Bridgestone tyre that's designed for Ferraris!

Also interested in how the mobility kit or can of gunk is working out for people...

cheers
Willy

HandsomeDan

I thought the f10 ride was supposed to be good even with rfts?

bazz26

In that size buying online and getting fitted locally is probably your best option:

http://www.camskill.co.uk/m61b0s324p0/Car_Tyres_-_MPV_Tyres_-_People_Carrier_Tyres_-_18_inch_R18_inch_-_275_40_18_275_40R18

Eye watering money all the same but at least you have options.

Caliden

275's? Seems like a bit of overkill for just a 520d.

Fella I work with has an '05 525i msport and only has 255's

WillyWonka

HandsomeDan wrote: »

I thought the f10 ride was supposed to be good even with rfts?

It's not as bad as previous models. I can only compare to a 1 series SE both with and without RFTs and a 3 series MSport with RFT (jaysus!)

I'm sure the 5series SE is fine, but I think the MSport is just that bit too much.
It's possible I'm feeling the bumps more now because the tyres are worn??

WillyWonka

Caliden wrote: »

275's? Seems like a bit of overkill for just a 520d.

Fella I work with has an '05 525i msport and only has 255's

Those are what are on it from new...

WillyWonka

bazz26 wrote: »

In that size buying online and getting fitted locally is probably your best option:

http://www.camskill.co.uk/m61b0s324p0/Car_Tyres_-_MPV_Tyres_-_People_Carrier_Tyres_-_18_inch_R18_inch_-_275_40_18_275_40R18

Eye watering money all the same but at least you have options.

Cheers Bazz, I'm on to discount tyres in blanch to see what they can source and fit. Told them to look at camskill and check the Pirellis or Contis, will see what they can do.

bazz26

M Sport suspension is lower and stiffer than the standard SE.

Matt Simis

WillyWonka wrote: »

Those are what are on it from new...

Its still overkill, extra wide rears on them mostly just induces understeer.

Blazer

Apparently these are fine


225 55 R17 97 W
245 45 R18 96 Y


No need for staggered on 520D ..you can go all around as above or as in the link a staggered setup which is why you've 275's on,

http://www.rezulteo-tyres.ie/tyres-for-bmw/5-series/berline-f10/520d-2.0-d-184

Avns1s

Blazer wrote: »

Apparently these are fine


225 55 R17 97 W
245 45 R18 96 Y


No need for staggered on 520D ..you can go all around as above or as in the link a staggered setup which is why you've 275's on,

http://www.rezulteo-tyres.ie/tyres-for-bmw/5-series/berline-f10/520d-2.0-d-184

The F10 520d SE will be fine as you suggest BUT the F10 520d M Sport (as per the OP's car) must be staggered. Unless of course you change the wheels to suit the tyres you have suggested.

Matt Simis

Avns1s wrote: »

The F10 520d SE will be fine as you suggest BUT the F10 520d M Sport (as per the OP's car) must be staggered. Unless of course you change the wheels to suit the tyres you have suggested.

Why are people thanking this? Neither you nor the OPseems to understand the reasoning and logic behind staggering or tyre sizes.

The easiest way to "undo" the notion that tyres "have to be staggered" is to look at the Winter Tyre fitments, which are nearly always squared on BMWs (ie not staggered):
http://f10.5post.com/forums/attachment.php?attachmentid=576315&d=1315415517
Note that the F10 (MSport or not makes no difference) can put 245's all round, ie squared. The only time you cannot put the same on front and rear would be in a situation where the wheel width on the front was very narrow (ie 7.5") and the rear very wide (11").. however the 9"ers on the F10 MSport are nicely accommodating.


A Cars ECU cannot tell if an axle is "staggered" in the tyre sizes its fitted with. It can only detect rotations per minute, which is a function of tyre diameter, not tyre width.
This is why you could for instance (as a rough example) replace a 275-40 with a 245-45 tyre. As long as the front rear diameter difference is kept to whatever the ECU is expecting, it doesnt care.


Reasons for wide rear tyres:
- Grip for off the line traction (clearly this isnt applicable to a 520d, a 245 is not a narrow tyre and a 520 not a performance car).
- Marketing, as it subjectively looks better, though IMO a 245 on a 9" rim looks way cooler.
- To increase grip on the rear axle to cause the front axle to loose grip sooner, making a RWD car perform more like a FWD car (ie this is $hit but good for the layman).

Many track/drift performance BMW drivers switch to squared setups to allow a more neutral handling car which handles Under/Oversteer via Suspension and Drivetrain.

Avns1s

Matt Simis wrote: »

Why are people thanking this? Neither you nor the OPseems to understand the reasoning and logic behind staggering or tyre sizes.

The easiest way to "undo" the notion that tyres "have to be staggered" is to look at the Winter Tyre fitments, which are nearly always squared on BMWs (ie not staggered):
http://f10.5post.com/forums/attachment.php?attachmentid=576315&d=1315415517
Note that the F10 (MSport or not makes no difference) can put 245's all round, ie squared. The only time you cannot put the same on front and rear would be in a situation where the wheel width on the front was very narrow (ie 7.5") and the rear very wide (11").. however the 9"ers on the F10 MSport are nicely accommodating.


A Cars ECU cannot tell if an axle is "staggered" in the tyre sizes its fitted with. It can only detect rotations per minute, which is a function of tyre diameter, not tyre width.
This is why you could for instance (as a rough example) replace a 275-40 with a 245-45 tyre. As long as the front rear diameter difference is kept to whatever the ECU is expecting, it doesnt care.


Reasons for wide rear tyres:
- Grip for off the line traction (clearly this isnt applicable to a 520d, a 245 is not a narrow tyre and a 520 not a performance car).
- Marketing, as it subjectively looks better, though IMO a 245 on a 9" rim looks way cooler.
- To increase grip on the rear axle to cause the front axle to loose grip sooner, making a RWD car perform more like a FWD car (ie this is $hit but good for the layman).

Many track/drift performance BMW drivers switch to squared setups to allow a more neutral handling car which handles Under/Oversteer via Suspension and Drivetrain.

Jump off the high horse there for a minute Matt. I never said that the tyres had to be staggered on the car provided the wheels are changed. The factory fitted wheels on the M Sport are 30mm wider on the back than the front and therefore are not suitable to have the same tyres front and back. The rear tyres are over 10" wide and not 9" as your post states. I know this because I measured them before I made my earlier post.

Please re read my post!

Matt Simis

Avns1s wrote: »

Jump off the high horse there for a minute Matt. I never said that the tyres had to be staggered on the car provided the wheels are changed. The factory fitted wheels on the M Sport are 30mm wider on the back than the front and therefore are not suitable to have the same tyres front and back. The rear tyres are over 10" wide and not 9" as your post states. I know this because I measured them before I made my earlier post.

Please tell me you arent wasting everyones time by trying to measure a wheel with a ruler or tape? Thats not going to work. Also you mention measuring "tyres" as 10" and not alloys/wheels which is an irrelevant statement, the size of the alloy wheel determines the applicable range of tyres.

BMW offer about 20 wheel types on the F10, Msport or not:
http://www.realoem.com/bmw/partgrp.do?model=FW12&mospid=52407&hg=36&fg=15


BMW.ie state the wheels on the MSport 520d are:
18" Style 613M
or
19" Style 351M
http://www.bmw.ie/ie/en/general/ecom_uic/vco/content.html

18" 613M Specs
02 Light alloy rim 8JX18 ET:30 4 36117848572
02 Light alloy rim 9JX18 ET:44 2 36117848573

19" 351M specs:
02 Light alloy rim 8,5JX19 ET:33 2 36117842652
02 Light alloy rim 9JX19 ET:44 2 36117842653

Avns1s wrote: »

Please re read my post!

Yeah, tried that, both your posts are still incorrect.
Let just sum up, 8"/8.5" on the front and 9" on the rear = can fit 245s all round. Or 245 and a 255. Or 245 and whatever else as long as overall diameter is kept.


PS: I didnt go through all 20 wheels to try find a 10" rear model, but the as offered wheels by BMW.ie are the above. I checked several though, including the 20" wheels and they were all 9" on the rears.

Rather amusingly the 550i MSport on BMW.co.uk uses 245's on 8" wheels all round.. yet this thread revolves around the 520d as the special case!
http://www.bmw.co.uk/en/new-vehicles/5/saloon/2013/technicaldata.html

Avns1s

Matt Simis wrote: »

Please tell me you arent wasting everyones time by trying to measure a wheel with a ruler or tape? Thats not going to work. Also you mention measuring "tyres" as 10" and not alloys/wheels which is an irrelevant statement, the size of the alloy wheel determines the applicable range of tyres.

BMW offer about 20 wheel types on the F10, Msport or not:
http://www.realoem.com/bmw/partgrp.do?model=FW12&mospid=52407&hg=36&fg=15


BMW.ie state the wheels on the MSport 520d are:
18" Style 613M
or
19" Style 351M
http://www.bmw.ie/ie/en/general/ecom_uic/vco/content.html

18" 613M Specs
02 Light alloy rim 8JX18 ET:30 4 36117848572
02 Light alloy rim 9JX18 ET:44 2 36117848573

19" 351M specs:
02 Light alloy rim 8,5JX19 ET:33 2 36117842652
02 Light alloy rim 9JX19 ET:44 2 36117842653


Yeah, tried that, both your posts are still incorrect.
Let just sum up, 8"/8.5" on the front and 9" on the rear = can fit 245s all round. Or 245 and a 255. Or 245 and whatever else as long as overall diameter is kept.

The factory fitted rear rims on a BMW M Sport are approx. 30mm wider than the front. To suggest that someone fits the exact same tyres front and back on these rims is ridiculous at least and dangerous at best.

Now, if you have such a car perhaps you are more knowledgeable than the rest of us. Somehow you seem to be relying on web searches and failing to interpret the results properly in terms of trying to create a foundation for your argument.

Matt Simis

Avns1s wrote: »

The factory fitted rear rims on a BMW M Sport are approx. 30mm wider than the front. To suggest that someone fits the exact same tyres front and back on these rims is ridiculous at least and dangerous at best.

Christ sake. The highlighted part of you post is utterly incorrect.

Avns1s wrote: »

Now, if you have such a car perhaps you are more knowledgeable than the rest of us. Somehow you seem to be relying on web searches and failing to interpret the results properly in terms of trying to create a foundation for your argument.

"Perhaps if I have such a car". Web Searches - are you for real? No I thankfully dont have an entry level 4cylinder diesel. I have a V12 405ft/lbs BMW with 10.5" rears running a 255 series Falken 452's and a 9" fronts running 245 series Dunlops, however I could put 255s allround if I wanted. Or if I had a much narrower wheel like a F10 MSport I could put 245s allround. Tyre Diameter man, diameter matters.

My cars can take a range of sizes (275 is stock rear, 295s fit), as can any car if the owner has a clue about how this $hit works. My uncle however has a F10 520d MSport and I went though this same completely illogical conversation with him too.

Avns1s

Matt Simis wrote: »

Christ sake. The highlighted part of you post is utterly incorrect.

"Perhaps if I have such a car". Web Searches - are you for real? No I thankfully dont have an entry level 4cylinder diesel. I have a V12 405ft/lbs BMW with 10.5" rears running a 255 series Falken 453 and a 9" fronts running 245 series Dunlops.

My cars can take a range of sizes, as can any car if the owner has a clue about how this $hit works.

I think you could do with taking a chill tablet! Perhaps you might be able to deal with this discussion in a factual and rational way then! You might also not look down on those with "entry level 4 cylinder diesels"!

Matt Simis

Avns1s wrote: »

I think you could do with taking a chill tablet! Perhaps you might be able to deal with this discussion in a factual and rational way then!

I explained it factually but you literally forced yourself not to understand and just kept repeating your own misunderstanding. Over and over.
My first reply to you rationally and factually gave you the answer, its you that went off on the high horse accusations.

Avns1s wrote: »

You might also not look down on those with "entry level 4 cylinder diesels"!

Lol, sure thing.

George Dalton

Matt Simis wrote: »

Christ sake. The highlighted part of you post is utterly incorrect.

"Perhaps if I have such a car". Web Searches - are you for real? No I thankfully dont have an entry level 4cylinder diesel. I have a V12 405ft/lbs BMW with 10.5" rears running a 255 series Falken 452's and a 9" fronts running 245 series Dunlops, however I could put 255s allround if I wanted. Or if I had a much narrower wheel like a F10 MSport I could put 245s allround. Tyre Diameter man, diameter matters.

My cars can take a range of sizes (275 is stock rear, 295s fit), as can any car if the owner has a clue about how this $hit works. My uncle however has a F10 520d MSport and I went though this same completely illogical conversation with him too.

What width are the front and rear wheels on an F10 M-Sport?

Without knowing that you can't say for sure whether or not it is acceptable to fit 245 tyres all round.

blingrhino

Jeasus lads relax!

Anyway willy I bought two 275/40 r18 bridgestones in newry on Wednesday for
£530 stg , not cheap I know considering 20000 miles is about be max out of them but the best price in the south I could was €680 euro so about €90 saved .

Matt Simis

George Dalton wrote: »

What width are the front and rear wheels on an F10 M-Sport?

Without knowing that you can't say for sure whether or not it is acceptable to fit 245 tyres all round.

Why do tyre threads always end up like this!? People need to read, then post.
George, I provided all this which is why I can say the things Im saying for sure, with direct links to the exact wheels on RealOEM. Just look at the previous page.

They are nothing special size wise and easily fit a squared setup. Online tyre selectors back this up, as does the F10 owners club, also linked.. its all just numbers.

Mr.David

Matt is correct.

For a given rim size there are a range of tyre widths that are suitable. Off the top of my head I do not know what they are for 9J or 10J wheels but it is correct.