Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Terbs on 05 May 2012, 14:59:20
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Hiya all....
Basic question.....
Can anyone tell me what my tyre pressures supposed to be. I cannot find any reference to my size in my handbook (not for my car...got it on fleabay)
Nothing in Haynes.........
Tyre size is.....235 45 17 on w reg 2.5 Elite estate.
I have to ask the question as I have fubared a rear set on incorrect pressures.........even the bloke at National tyres took a guess :o
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30 psi normal load 40 psi fully loaded i think,also if you look on site there is an online handbook manual you can down load :y
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Is that just the rear, mate...if so, what are the fronts :y
I looked for that flippin' manual...can't find it :( I expect its a Specsavers jobbie ;D ;D :y
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here it is http://www.omegaowners.com/forum/index.php?topic=90477.0
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Thanks Martin...got it :y
Does not show a 2.5 estate....but all the other types show 30 front and 33 rear, so I will go with that :y
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Always run the Estates at 34psi front 36psi rears - no wear issues and handling ok - HTH :y
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Always run the Estates at 34psi front 36psi rears - no wear issues and handling ok - HTH :y
Right...I'll pump 'em up a bit more in the morning :y
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http://www.omegaowners.com/forum/index.php?topic=90494.0
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Spent loads of time messing with tyre pressures on my old 3.0 MV6 Estates, for me what worked well was 33 fronts and 37 on the backs, 1 driver and some light weight stuff in the back.
For 2 plus more people and some extra luggage, go for 35 and 40.
Chris :y
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Tyres make a differance IME. Some experimentation won't hurt, within reason. :)
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I've got 225 55 16 on my 2003 2.2 dti Estate so plan to run them at 34 F and 36 R normal use, but was wondering what do people recommend with a cravan on the back and luggage in the boot; I was thinking 40 F and 45 R (we usually try to get the caravan noseweight to about 75/80kgs) - Any thoughts?
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I've got 225 55 16 on my 2003 2.2 dti Estate so plan to run them at 34 F and 36 R normal use, but was wondering what do people recommend with a cravan on the back and luggage in the boot; I was thinking 40 F and 45 R (we usually try to get the caravan noseweight to about 75/80kgs) - Any thoughts?
Sounds a bit high for those tyres, but experiment a bit, keeping an eye on overall handling (primary concern) and wear (secondary)
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I've got 225 55 16 on my 2003 2.2 dti Estate so plan to run them at 34 F and 36 R normal use, but was wondering what do people recommend with a cravan on the back and luggage in the boot; I was thinking 40 F and 45 R (we usually try to get the caravan noseweight to about 75/80kgs) - Any thoughts?
Sounds a bit high for those tyres, but experiment a bit, keeping an eye on overall handling (primary concern) and wear (secondary)
As stated always run the Estates at 34psi front 36psi rears - no wear issues and handling ok - tyres 225/55/16 ;)
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I've got 225 55 16 on my 2003 2.2 dti Estate so plan to run them at 34 F and 36 R normal use, but was wondering what do people recommend with a cravan on the back and luggage in the boot; I was thinking 40 F and 45 R (we usually try to get the caravan noseweight to about 75/80kgs) - Any thoughts?
Sounds a bit high for those tyres, but experiment a bit, keeping an eye on overall handling (primary concern) and wear (secondary)
Exessive wear due too high pressure is a myth these days. It did cause this to old tyres without belts but modern steel-belted tyres are not that prone to wear when over-inflated. Pressure 0,5 bar under recommended will result as wear but pressure 0,5 bar above recommended will not; it is just more uncomfortable and probably more difficult to drive in some circumstances.
Many studies have been made (been reading some from domestic tyre manufacturer...) and findings are that under-inflation does make tyres to wear. Over-inflation does not, because of the extremely rigid belts; tyre keeps its shape very well when pressurized.
One interesting thing is that driving wheels (rears on Omega) wear in the middle and this is due that the tyre disforms to "donut-shape" (toroid might be correct mathematical term?) in high speeds/acceleration. This can be seen in e.g. top fuel dragsters when they start. And this also demonstrates why low-pressure tyres would wear.
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Thanks for the replies - any thoughts on whether to increase the pressures when fully loaded with a caravan on the back? Chris
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Thanks for the replies - any thoughts on whether to increase the pressures when fully loaded with a caravan on the back? Chris
Definite YES from me ... I put mine up to 41 F 45 R for towing, I've seen the result of towing with under inflated tyres ... not good... :(
What folks don't realise is the pressure in the tyre is there to support/stiffen the sidewall, which is actually supporting the weight. If the tyre is "soft" the sidewall flexes a great deal every rotation, out at the bottom, in at the top, this leads to a build up of heat within the tyre sidewall and leads to failure.
The weight of the 'van on the towball, (usually around 80Kgs noseweight) and the oscillating movement of the tow hitch whilst moving over bumps in the road, increases the flexing of the tyre at normal pressure, so more support is required by increasing the pressure.
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Obviously, I'm not a pikey, so don't tow :P
But when fully laden with camping gear and roofbox, I run 36F 45R on my saloon
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I've been putting mine to 32 all around, I've found with the bigger tyres, low pressures can give more "tyre pull" than the smaller 16's
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I've been putting mine to 32 all around, I've found with the bigger tyres, low pressures can give more "tyre pull" than the smaller 16's
32 may be fine solo .. but nothing like enough when hitched to the tin-tent IMHO ... :(
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I've been putting mine to 32 all around, I've found with the bigger tyres, low pressures can give more "tyre pull" than the smaller 16's
32 may be fine solo .. but nothing like enough when hitched to the tin-tent IMHO ... :(
Yeah I'd up them quite a bit if I was doing that kind of towing
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Thanks all, consensus seems to indicate that I'll stick with 34F 36R unladen and 40F 45R laden with the tin-tent on! Chris