TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

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Minty
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TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

Post by Minty » Fri Nov 09, 2018 8:42 pm

Hi All,

My 2007 E60 B5 runs on 20" diams Alpina rims. The Alpina manual I have for the car refers only to 19" diams and the pressures it recommends is 2.8 bar front and 3.0 bar rear. It appears that those pressures are recommended for a load of 3 persons up to 5 persons + luggage. On the door pillar of the car it does show pressures for 20" diam wheels of 3.1 bar front and 3.2 bar rear, however, it shows only a persons loading of 5 people + luggage. The car is very rarely used with more than 2 people on board, that being myself and a passenger. I appreciate that recommendations are exactly that and can be played with marginally for best comfort, so, is there any B5 aficionados out there who could give me a steer (excuse the pun) on the best pressures for this car bearing in mind the human load usually on board. The tyres are Michelin Super Sports, rears are 285/30/ZR20 with the fronts being 245/35/ZR20. Advice gratefully received as always.

E24man
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Re: TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

Post by E24man » Fri Nov 09, 2018 9:53 pm

Minty wrote:Hi All,
On the door pillar of the car it does show pressures for 20" diam wheels of 3.1 bar front and 3.2 bar rear, however, it shows only a persons loading of 5 people + luggage. The car is very rarely used with more than 2 people on board, that being myself and a passenger.
IIRC all modern Alpinas show that same similar sticker with just the pressure for 5 people + luggage; you simply have to judge from tyre wear or ride quality how much you take off to suit yourself. For the 20's on my B12 I take 4psi off the suggested numbers.
E24man

2001 Alpina B10 V8 Touring (1 of 12 rhd)
1997 Alpina B12 5.7 L (1 of 2 rhd)
1995 Alpina B10 4.6 Touring (1 of 1 rhd)
1985 BMW M635CSi (1 of 524 rhd made, but less than half left now)
1982 BMW 635CSiA (1 of only hundreds left from the thousands made and still valiantly fighting a rusty grave)

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Minty
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Post by Minty » Fri Nov 09, 2018 10:35 pm

Thanks for that, did you find the ride a bit more compliant? did you find it made any real difference to the way your B12 handled?

E24man
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Post by E24man » Sat Nov 10, 2018 8:14 pm

The B12 ride is absolutely perfect - the reason for changing was to even out tyre wear across the width of the tyre.
E24man

2001 Alpina B10 V8 Touring (1 of 12 rhd)
1997 Alpina B12 5.7 L (1 of 2 rhd)
1995 Alpina B10 4.6 Touring (1 of 1 rhd)
1985 BMW M635CSi (1 of 524 rhd made, but less than half left now)
1982 BMW 635CSiA (1 of only hundreds left from the thousands made and still valiantly fighting a rusty grave)

Jervint
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Re: TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

Post by Jervint » Tue Jun 04, 2019 5:08 pm

My 2006 runs 19s but I had the same issue.

UK roads are not right for those pressures and those pressure are to avoid issues with high speed travel. ie. Sustained high speed!!

If the tyre pressures are low and you were on the autobahn for example, a hot spot can form on the tyre and lead to a blow out. This is why the tyre pressures are so high.

As I am in the UK with crappy roads and not much chance of sustaining anything more than *ahem* mph, i reduced the pressures by 2 psi at a time until I was satisfied with the ride.

From memory I run around 38 psi but 3 bar (45 psi) is way too high unless you have super clean tarmac and intend to run the car at autoban speeds.

I would suggest setting the tyres at 40 psi rear and 38 front and if you still think it's firm try a 36/38.

I've been running Michelin Supersports but let me know your preferred tyre as it may matter for this...Michelins of that era had a very strong sidewall and shoulder.

hth

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Minty
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Re: TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

Post by Minty » Mon Jul 01, 2019 10:33 pm

Cheers, I will try that, and your reasoning makes sense.

Best
Minty

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b0ardgamer
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Re: TYRE PRESSURE ADVICE - ALPINA B5 on 20" DIAMETERS

Post by b0ardgamer » Mon Jul 01, 2019 11:17 pm

I've got an F32 B4S on Michelins, and I'm running at the specified pressures. In my previous 130i, I had to swerve around holes to avoid losing my fillings. Now I can drive on any stretch of road in complete comfort. Potholes - don't care, barely feel 'em. Grounding the front splitter is the only thing I have to watch out for..... (I wish there was a button to raise the suspension by a few inches.)

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