Worth getting shot of alloys?

Discussion in 'Motoring' started by DrPhil, Sep 9, 2012.

  1. DrPhil

    DrPhil
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    I've heard that you get worse mpg with alloy wheels, plus I've found that have to put air in the front tyres every few weeks as every bump I hit seems to bounce half of the air out.

    To top it off I failed to get air into them today and ended up butchering one of the tyres.

    Is there a difference if I switch to normal wheels and lose the alloys? I'm too old to give a damn about the aesthetics of the wheels!
     

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  2. FZR400RRSP

    FZR400RRSP
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    Alloy wheels are lighter than steel wheels, for a given size.
    That means they give the suspension an easier time, but an added bonus of any weight saving is better mpg.
    Who told/where did you read about worse mpg??
    Did they maybe mean wider tyres mean worse mpg, because of greater friction?
    That's not an alloy wheel trait, per se.
    I can go weeks without losing any pressure as well.

    If you switch to smaller steel wheels, you'll get a comfier ride.
    But if you expect better mpg, I think you'll be sorely disappointed.
     
    Last edited: Sep 9, 2012
  3. DrPhil

    DrPhil
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    You're right, I think it was the wider wheels that were described as a source of lower mpg.

    As for losing air, bear in mind that I live in Ireland, and in a county renowned for its bad roads. It's a bumpy ride and that's why I think I lose air.
     
  4. KelvinS1965

    KelvinS1965
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    It's possible that you have a layer of corrosion on the inside of the wheel rim. My old RS2000 had this (a kind of white deposit rather than rust like steel wheels would have). I had them blasted and polished, plus I painted the inside surface before taking them back to have new tyres on. They haven't lost pressure since (to be fair that was 16 years ago and the last 12 years it's been sat in my garage :blush:).

    Point being that you could just get the tyres taken off and the alloys cleaned, not even blasted and polished like mine, to get a better seal on the rim, which I suspect is what the issue is...Well that or the valve need replacing or outside chance the alloys have gone porous (Google you make of car to see if it's a known issue perhaps?).

    No harm in changing to steel wheels, but you might not need to.
     
  5. DrPhil

    DrPhil
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    Sounds good.

    I have to go get a new tyre tomorrow to replace the one I mangled today so I'll see if they can check out both.
     
  6. DrPhil

    DrPhil
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    New tyre on. Took the other front one off and is giving it a good scrub now to check the seals.
     
  7. paulyoung666

    paulyoung666
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    There is a possibility that they could be porous .....
     
  8. DrPhil

    DrPhil
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    £55, could have been worse.

    They found no problem with the left front, so maybe it just needed reseated/resealed.

    I'll see what happens over the next few weeks.
     
  9. un1eash

    un1eash
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    Our old Tigra was on large alloys and i hit a few pot holes which caused instant deflation, never had that issue with any other wheels before though.
     
  10. Kebabhead

    Kebabhead
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    Are those aftermarket alloys?

    You could always switch to smaller alloys so you can fit a standard size rather than run on low profile tyres
     
  11. DrPhil

    DrPhil
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    No clue. They're what were on it when I got it!
     
  12. lmccauley

    lmccauley
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    I agree with Kebabhead. And I thought the blue moon was last month ;)
     
  13. lmccauley

    lmccauley
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    What car is it?

    What does it say on the side of the tyres? e.g. 225/40 R16
     
  14. DrPhil

    DrPhil
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    Peugeot 206.

    I'll have to check later, from the pic I posted previously I think it's 205/40 R17
     
  15. lmccauley

    lmccauley
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    Looks like standard size is 175/65 R14 or 195/45 R16 for the GTI.
     
  16. DrPhil

    DrPhil
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    :laugh:

    You're talking in riddles my man!
     
  17. lmccauley

    lmccauley
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    Sorry! Was thinking out loud.

    Assuming your car isn't a 206 GTI, then the standard wheel would have a 14 inch wheel. That is, the metal bit is 14 inches radius. The rest of the "wheel" is made up of the rubber tyre.

    If you have a 17 inch wheel, then you have correspondingly less thickness of tyre. The air in the tyre provides some cushioning, so a larger wheel size will usually result in the ride being harsher and it seems more likely to lose air over pot-holes.

    Attached is a visual comparison between a 175/65 R14 and 205/40 R17.
     

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    Last edited: Sep 10, 2012
  18. DrPhil

    DrPhil
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    It's not a gti. 206 HDI.
     
  19. BluWarfareHD09

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    Most modern cars come with alloy wheels so my suspect it just needed to be reseated, have you thought about having them nitrogen filled. Now I know a lot of people argue you don't get a benefit from it, but I have had mine nitrogen filled since I had all 4 of my tire's replaced about 2 year's ago and have only just felt the need to have them refilled and that only cost £4 for all 4 from ATS Euromaster.
     
  20. paulyoung666

    paulyoung666
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    Please , share what the benefits of nitrogen are ........
     
  21. FZR400RRSP

    FZR400RRSP
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    In a racing car, better stability of pressures with temperature.
    In a road car, pure pose value and nothing else.:-(
     
  22. BluWarfareHD09

    BluWarfareHD09
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    Like I said the pressure maintained a lot longer than when when I had air and defiantly reduce pressure fluctuation from heat, I also found around 1-2mpg difference. Just because you don't feel there is a benefit doesn't mean others don't, but I feel that there is a benefit and for £4 and that lasts over a year there is no real loss if you get it and feel yourself there is no benefit.
     
  23. paulyoung666

    paulyoung666
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    agreed ......

    you believed the blurb , never seen a nitrogen cylinder in kwik fit , only ever heard a compressor chugging away :hiya:
     
  24. un1eash

    un1eash
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    Even the AA say nitrogen is pointless unless for specialist applications. Air is already 78% nitrogen, so I can't see it making any difference to a road vechicle yet alone improving mpg. Road going cars just don't get that much temperature in the tyres to show a noticable change in pressure. Not to mention the inconvenience.
     
  25. alexs2

    alexs2
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    Especially when you roll up at the nearest service station and start asking where the nitrogen is.....
     
  26. DVD-Man

    DVD-Man
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    One thing I have experienced is branded tyres hold their pressures much better than budget no name tyres.

    It could be this is the issue you are having.
     
  27. davidwatsonok

    davidwatsonok
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    Cheap alloy wheels are usually quick to buckle, and the rim seal can be damaged. Those rims look like they've had a tough life and aren't in the best condition. The top brands such as OZ and BBS are usually much stronger, but at a price. If I were you I'd be looking at getting some decent rims maybe one wheel size down (so if they're 17", drop to 16"), allowing the use of a higher profile to absorb the bumps better.

    With regards to weight, alloys is indeed lighter than steel, but also weaker, meaning more has to be used to achieve the same structural integrity. In truth, the difference in weight once the tyre is on is minimal. However, some manufacturers use a higher grade of alloy compound, and flow forming casting which reduces the oxygen content and increases the strength of the alloy greatly, meaning much less can attain the same strength. OZ Superlegerra, Ultralegerra, and Rays are known for this, and the reduced weight has many benefits. The reduce mass improves acceleration and braking, and lower unsprung weight improves suspension action. Again, the rpice will reflect the quality.

    Finally, don't just point the finger at the wheel, as cheap tyres can be woeful. Budget packages from Halfords et al come with cheapo 'Ditchfinder' tyres usually, so when you make the change fitting some quality rubber will help too. I like Uniroyal's Rainsport or Rain Expert tyres for the generally wet UK roads, but Vredestein make some excellent rubber too, especially their Sessanta. The usual Goodyear, Pirelli and Michelin won't let you down either.
     
  28. spankey spangle

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    ATS do nitrogen, never seen it a kwik fit
     
  29. IronGiant

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    What have kwick fit got to do with bluewarefare recommending nitrogen? :confused:
     
  30. paulyoung666

    paulyoung666
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    Absolutely no idea to be honest , even though I posted it .......
     

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