Replacing run flats

[mitch36]

Hi everyone,

I've been a member for a few months and I've enjoyed reading many of the posts and I'm hoping for some advice please?

My E89 currently has 255/30 R19 run flats on the rear and I was thinking about changing to 255/35 R19 for maybe a more comfortable ride. Would this be okay or am I best to stay with the original profile? And if I did change to the higher profile would this affect anything?

Also I was looking at either the Michelin Pilot Sport 4S or Continental Sport Contact 7. Any recommendations would be appreciated.

Many thanks

Simon.

 

[Beerman]

If you change to a bigger profile tyre it will made your speedometer inaccurate.

There will be a big difference in ride quality between runflats and standard tyres, but 30% aspect ratio is never going to be great.

Both tyres you've suggested are top tyres. Some people are concerned with Michelin in cold temperatures. The Goodyear asymmetric 5/6 isn't quite as good as the tyres you're considering, but they have softer sidewalls and will improve the ride more.

Also don't mix runflats and normal tyres.

 

[B21]

If you change the rear to 255/35 19 you should really change the front to 225/40 19 to match rolling circumferences..otherwise in a bad situation the stability control system may have a bad day..

On the E89 Conti SC 7 is top dog…arguably GY Assy 6 edges the MP4S into 3rd…but as discussed for most folks given where / how they drive many suitable tyres..

 

[mitch36]

Many thanks for the replies.

I think if it's going to change things I'll stick to the standard sizes and I'll certainly look at the Continental Sport Contact 7's.

Hopefully the change from run flats will be noticeable at those sizes and help protect the wheels from cracking also.

Simon

 

[B21]

Many thanks for the replies.

I think if it's going to change things I'll stick to the standard sizes and I'll certainly look at the Continental Sport Contact 7's.

Hopefully the change from run flats will be noticeable at those sizes and help protect the wheels from cracking also.

Simon

I offer a money back unconditional guarantee that your handling and ride will be transformed by SC7s

There are never any guarantees on 326M alloys

 

[mitch36]

I offer a money back unconditional guarantee that your handling and ride will be transformed by SC7s

Wow, that's certainly a glowing endorsement for the Continental's, if I'm not happy I'll be in touch )

 

[B21]

I offer a money back unconditional guarantee that your handling and ride will be transformed by SC7s

Wow, that's certainly a glowing endorsement for the Continental's, if I'm not happy I'll be in touch )

Pls feel free to do so..

 

[jenniferlouise]

Simon, having been in the same position as you for what ended up being too long, I endorse Peter’s recommendation of Conti SC7 rubber on standard profile 19s.

I put off removing the Bridgestone RFTs as a) I’d got lots of tread left (and I’m a poor pensioner) and b) surely BMW wouldn’t have compromised the ride that much with their tyre choice…

Of course, smaller wheels and deeper rubber would help, but, you’ll definitely notice a big improvement. And if you don’t agree I will refer you to B21’s no-quibble (cough) warranty

Shop around for the deals.

 

[mitch36]

Simon, having been in the same position as you for what ended up being too long, I endorse Peter’s recommendation of Conti SC7 rubber on standard profile 19s.

I put off removing the Bridgestone RFTs as a) I’d got lots of tread left (and I’m a poor pensioner) and b) surely BMW wouldn’t have compromised the ride that much with their tyre choice…

Of course, smaller wheels and deeper rubber would help, but, you’ll definitely notice a big improvement. And if you don’t agree I will refer you to B21’s no-quibble (cough) warranty

Shop around for the deals

Thanks for your input and confirmation the Conti SC7's are the way to go. I've also got lots of tread remaining on the run flats but hoping for a more comfortable ride and hopefully a bit of protection for the wheels.

I'll have a look around, there seems to be a few deals on at the moment )

 

[ARCS]

I too concur with the above statements on the SC7's. You won't regret it. My previous 19's had 255/35 on the rears, and the ride was fine.

 

[Busterboo]

mitch36, how old are the tyres on your car?

They shouldn't be more than 6 years.

 

[mitch36]

I too concur with the above statements on the SC7's. You won't regret it. My previous 19's had 255/35 on the rears, and the ride was fine.

Thank you )

mitch36, how old are the tyres on your car?

They shouldn't be more than 6 years.

I'm not sure to be honest, I'll have a look when I get home but regardless I'll be changing them )

 

[jenniferlouise]

mitch36, how old are the tyres on your car?

They shouldn't be more than 6 years.

I thought guidance was 10?


That said, 30 profile RFTs deserve a quick death. I keep one for sentimental reason, fitted to a repaired 326M as my emergency garage ‘spare’

 

[jenniferlouise]

I’m already considering rebooting the CLS based on tyre age rather than wear… the Pirelli P-Zero’s are grippy but the rears (oldest) have signs of tyre wall degradation. Think they are 8 years old (need to check again). The same tyre is around £300/corner but based on the Z4 experience I’d probably go Conti SC7 here too. Altho I’ll readership some mid range options; anyone tried the wet weather (supposed) expert Uniroyal ?

 

[Busterboo]

I thought guidance was 10?

Yes, 10 is MoT failure.

 

[B21]

mitch36, how old are the tyres on your car?

They shouldn't be more than 6 years.

I thought guidance was 10?


That said, 30 profile RFTs deserve a quick death. I keep one for sentimental reason, fitted to a repaired 326M as my emergency garage ‘spare’

Never take an opinion as a fact… :tumbleweed: :headbang:

Michelin

Tyre age limit : the 10-year threshold
If the tyres have not been replaced 10 years after their date of manufacture, Michelin recommends replacing them with new tyres as a precaution. This recommendation also applies to spare tyres.

Conti

Continental recommends that all tyres that are over 10 years old (as shown on the tyre’s date stamp) should be replaced with new tyres.

 

[B21]

I thought guidance was 10?

Yes, 10 is MoT failure.

Incorrect ..only applies to PSV and similar vehicles… :thumbsdown:

UK Gov MOT advice to tester says..

Tyre age
The check of tyre age applies to all vehicles with more than 8 passenger seats, other than vehicles of historical interest.

 

[Beerman]

I thought guidance was 10?

Yes, 10 is MoT failure.

The 10 year rule is for goods vehicles and buses etc in excess of 3500kg. It doesn't apply to cars.

I do enough miles that my tyres don't last that long, but even after one winter the condition of the tyres has dropped off noticeably.

 

[enuff_zed]

I thought guidance was 10?

Yes, 10 is MoT failure.

Not exactly:

Tyres over ten years old at the time of test must be failed if they are on:

any front steered axle
any rear axle of a minibus with a single wheel fitment.

 

[ARCS]

anyone tried the wet weather (supposed) expert Uniroyal ?

I've got uniroyals on a 2nd set of wheels for my cayman, and can say that they're fairly grippy in the wet. A bit harsher ride than the ps4's, though.