[bodgerx]

Originally Posted by BIGTIME

I have my rears runflats at 44-45 psi which seems pretty common on here when cold. I had a spirited drive last and tested the pressures. I realise they increase when warm but they had gone up 5-6 psi to 50 psi. Now I don't know what to set them at as when warmed up they are too high.

Best thing you can do is check them cold and after use, like you've done. As long as you are at a below the sidewall when they are hot you should be fine. 45 isn't far off what I run. Usually about 47-48 on the front 49-50 on the rear - I don't drive that aggressively so I only find about 2-3 psi up on that after a long drive.

Obviously some here are taking offense to to these kinds of pressures, so you may want to keep this to yourself

[F31-340i]

Originally Posted by xenon

Christ on a bike.

You ain't gonna convince him, ajd. Just hope you're not crossing the road on a wet, painted surface as he's coming towards you. Still, I get the impression he'd be travelling at 11.3mph convinced that was the most economical speed.

Lol - I know he'll never be convinced. I do find it quite interesting that you can compile a whole range of facts but they can have no impact on people's beliefs. I find this human resistance interesting, parallels I'm sure with religion etc.

[xenon]

It's also to do with cherry-picking facts on the internet that support your argument and glossing over those that don't. I realise we've done that too but I'd be far more inclined to rely on something about tyres from a leading tyre manufacturer then some vague wiki postings or "facts" that are nothing more than opinions.

Hey ho.

[bodgerx]

The same also applies to you both.

My experience comes my own experimentation and real-world experience.

Just because you consider your argument to be stronger, you have to resort to saying my argument is based on some kind of irrational belief. Hey ho indeed!

[xenon]

Which is exactly what I said. If your own experiments have more credibility than Michelin's reasearch then carry on. I agree with the other contentions that it's a dangerous practice but nothing will convince you otherwise and hence this conversation has a maddening circularity.

For that reason: Ahm oot.

[bodgerx]

Originally Posted by xenon

Which is exactly what I said. If your own experiments have more credibility than Michelin's reasearch then carry on. I agree with the other contentions that it's a dangerous practice but nothing will convince you otherwise and hence this conversation has a maddening circularity.

For that reason: Ahm oot.

I never said my experiences had more credibility.
Dangerous based on what? Again you are assuming over inflation at close to the maximum recommended side-wall pressure. The evidence says that increasing your pressures over the manufacturer's standard pressures will actually get you better performance in conditions such as rain or snow.

[xenon]

Originally Posted by bodgerx

The evidence says that increasing your pressures over the manufacturer's standard pressures will actually get you better performance in conditions such as rain or snow.

You've overstepped the mark a little there and revealed that you're a skilled and plausible wind-up merchant. Well done! You certainly had me and ajd reeled in like good 'uns.

Go on, give us another!!!

[bodgerx]

Originally Posted by xenon

You've overstepped the mark a little there and revealed that you're a skilled and plausible wind-up merchant. Well done! You certainly had me and ajd reeled in like good 'uns.

Go on, give us another!!!

Ok then, if it makes you happy, some car manufacturers advise using slightly increased pressures for winter tyres - some VW owners manuals state to increase pressure by a few psi...

[xenon]

Nah, give something that's not about tyres. Perhaps something along the lines of a magnet around the fuel lines increases fuel economy by 20%. I always fall for that one despite having a Ph.D. in Applied Chemistry.

Go on, give it your best shot.

[bodgerx]

Originally Posted by xenon

Nah, give something that's not about tyres. Perhaps something along the lines of a magnet around the fuel lines increases fuel economy by 20%. I always fall for that one despite having a Ph.D. in Applied Chemistry.

Go on, give it your best shot.

So you actually think that having low tyre pressures are the way to go in the snow? Interesting.

From the AA site:

"Check pressures too. Don't be tempted to try reducing pressure when there's snow and ice about – it doesn't help with grip but can affect handling."

[xenon]

I never said anything about reducing; you did.

Which pretty much sums up your whole viewpoint.

[bodgerx]

Originally Posted by xenon

I never said anything about reducing; you did.

Which pretty much sums up your whole viewpoint.

I refer you to your highlight in post 51. Which is it in snow higher or lower? You seem to think higher is bad...

[xenon]

I'd say the recommended pressure - unconventional I know. Bored with this now - you win.

[F31-340i]

My experience comes my own experimentation and real-world experience

So, you've tested the grip of your car running 50 psi in the tyres under full (ABS kicked in) braking in the wet?

No I didn't think so.

[bodgerx]

Originally Posted by ///ajd

So, you've tested the grip of your car running 50 psi in the tyres under full (ABS kicked in) braking in the wet?

No I didn't think so.

Weird, usually you wait for the response first

Like I said, I've been running these kinds of pressures for some years. I've done a few emergency stops in the wet in this time, driven on ice, snow etc. Performance is very good, no alarms and no surprises.

[RP2192]

Guys - I've just upgraded from a E46 325 vert to a E92 320d M sport, running on 19" 225 alloys and bridgestone runflats.

The info on the inside door panel recommeds 2.1 fr, and 2.3 rear. This is the first time I've ever used runflats and although they seem fine on the motorway - they are little harsh around town on these psi's. I've increased the pressures to 2.2 and 2.4 respectively but it still seems a little harsh. Would it be ok to run at 2.3/4 frnt and 2.5/6 on the rear ??

Most of my driving is around town and I only do approx 10miles a day commuting and a little more as personal mileage. So would runnnig at the slightly elevated levels in this scenerio be ok and more importantly safe ?

Thanks

[waybar17]

The harshness on RFT is because of the thick sidewalls, not flexing as much as standard tyres.

What a fantastic thread!!!

My Westfield weighs 500kg, if I inflate the tyres above 22psi it loses grip very easily. There needs to be some flexibility in the rubber to allow the tyres to grip properly when being pushed to the limit around corners.

I run my 19" RFT on the beemer at the pressures it says on the door sticker - seems ok to me

[zltm089]

always good to read those tyre pressure threads!....LOL....

[BGM]

Originally Posted by zltm089

always good to read those tyre pressure threads!....LOL....

they are just flame bait