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Author Topic: Tyre Pressure for Michelin XAS  (Read 5629 times)
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nthomas1
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« on: 13 August, 2015, 09:59:59 PM »

From experience, what is the optimum tyre pressure for Michelin XAS tyres on standard S2 Coupe steel rims - for normal driving with one or two on board?  Thanks in anticipation, Norm
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Norm Thomas
Ormskirk, Lancashire

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lancialulu
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« Reply #1 on: 14 August, 2015, 07:06:25 AM »

Around 24psi all round. Are they new rubber?
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nthomas1
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« Reply #2 on: 14 August, 2015, 07:24:35 PM »

Thanks for the response.   Based on appearance I'm guessing they were fitted in the last 12 to 18 months.
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Norm Thomas
Ormskirk, Lancashire

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1973 Fulvia S2 Coupe
Various modern cars
Previous Lancias: S2 Coupe and S3 Coupe in late 1970s
lancialulu
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« Reply #3 on: 14 August, 2015, 07:28:46 PM »

If they squeal round the round abouts they may be a bit older Wink
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
rogerelias
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« Reply #4 on: 14 August, 2015, 08:01:34 PM »

look on the sidewall and you may see numbers like  2314 or similar in small numbers, which means tyres were made the 23rd week of 2014,
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davidwheeler
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« Reply #5 on: 15 August, 2015, 08:35:06 AM »

According to the handbook, 1.5Kg/sq.cm = 21.3psi to 1.7Kg/sq.cm = 24.1 psi for long runs fully loaded at high speed front and rear.
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
nistri
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« Reply #6 on: 24 August, 2015, 06:23:48 AM »

If the  tyres were made recently, they may need a much higher pressure (usually 2 bar).
Andrea
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Andrea Nistri

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« Reply #7 on: 24 August, 2015, 09:17:20 AM »

I had noticed that, in general, required tyre pressures tend to higher now compared with say 30 or 40 years ago. Way back then, 24psi would be fairly standard, whereas now, as Andrea has suggested, 2bar (29psi), if not higher, say 2.3bar (34psi) seems routine.

Is anyone able to shed some light on this shift please?

                                                       Andy
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John B
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« Reply #8 on: 24 August, 2015, 09:46:01 AM »

Would it be anything to do with the change from cross ply to radial ply tyres?
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lancialulu
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« Reply #9 on: 24 August, 2015, 11:01:49 AM »

Most likely due to side walls being lower profile on more modern tyres. So if running non standard lower profile tyres like I do I tend to go to 2bar.

Cant remember when Lancia stopped fitting crossplies but it must be pre Aprilia.
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
Neil
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« Reply #10 on: 24 August, 2015, 11:47:45 AM »

Tim, I think you are right, Fulvia always had radial tyres, but they would have been 82 series, today only 80 series tyres are generally available, which are marginally lower profile:  2Bar (~28psi) works well in my experience.
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Neil   
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JohnMillham
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« Reply #11 on: 24 August, 2015, 01:40:49 PM »

Most likely due to side walls being lower profile on more modern tyres. So if running non standard lower profile tyres like I do I tend to go to 2bar.

Cant remember when Lancia stopped fitting crossplies but it must be pre Aprilia.
The first Michelin Xs were fitted to Aurelias, so well after the Aprilia. See Longstone Tyres website, where there's a bit of tyre history.
Regards, John
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fay66
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« Reply #12 on: 24 August, 2015, 05:37:47 PM »

Tim, I think you are right, Fulvia always had radial tyres, but they would have been 82 series, today only 80 series tyres are generally available, which are marginally lower profile:  2Bar (~28psi) works well in my experience.

When I bought "Fay" she had what I believe was the original 155,14,x80 Michelin X's fitted, as she'd only done 27,000 miles with the original owner, and it looked like the spare had only been used lightly.

Brian
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« Reply #13 on: 25 August, 2015, 07:00:13 PM »

Agree, Aprilias were originally cross ply but Michelin X suited them very well.  Now universally on radials I suspect.  Agree also, 22 psi on my Fulvia means impossibly heavy steering with modern tyres.  Currently at 28 psi but tempted to go higher...
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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« Reply #14 on: 25 August, 2015, 10:40:36 PM »

David,
The new Dunlop Street Response  i've just fitted to my 2c are very good once the wheels are moving, even very slowly, so I have no complaints
I run 28psi all round.

Brian
8227 Cool
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
1999 Suzuki Wagon R+ GL, now my daughters
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
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