19 car wheel rims

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  • viatorem
    viatorem Forum Participant Posts: 645
    edited January 2018 #32

    If you took your Sorrento to 30mph on a flat level road and let it coast to a stop in neutral it would run further on the 17" wheels than on the 18" wheels because the rolling resistance of the tyre is higher with the 18" wheel. So more energy is need to move the 18" hence the higher consumption. The rolling resistance is primarily due to the width and construction of the tyre rubber and carcass. This is related to the tyre rating label fuel pump sign.

    Niro looks a good choice!

  • Cornersteady
    Cornersteady Club Member Posts: 14,431 ✭✭✭
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    edited January 2018 #33

    Ok I'm not an expert on this wheel size v mpg but a few sites I've been on do appear to suggest one affects the other:

    Larger wheel sizes, though they add a certain aesthetic appeal, are not generally helpful in increasing or maintaining efficient fuel economies. The larger wheel sizes increase the weight of the vehicle overall, taking more fuel to power it than it would with smaller tires. Having larger wheels also means there is a wider width which in turn creates an increased rolling resistance. As the rolling resistance increases, the engine has to work harder and use more fuel to move the tire

    Although consumers don't typically base their decision to change their wheels and tires on fuel economy, a little research could improve mileage. Rolling resistance is the key to fuel economy. ... Generally, it's easier to get a smaller wheel and tire package moving than a larger one, thus less power is required

    To summarise, a car’s engine finds it more difficult to rotate larger wheels, making for a decrease in overall acceleration. This is all assuming that every other component like the engine, driveshafts, gears and differentials are kept stock, making them specifically engineered for the original wheel size. Fuel economy will inevitably suffer as well due to the engine having to work harder to rotate the wheels

  • Metheven
    Metheven Club Member Posts: 3,987 ✭✭✭
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    edited January 2018 #34

    Corners, you may well have got that quote from 'carite.com', it also goes on to say it will affect the speedometer reading and that also meant the tyres would NOT have been resized to maintain the diameter. If you increase the wheel size you should always reduce the aspect ratio to match that diameter, then the speedo reading, gearing and fuel consumption will be very close to what it was previously. But being heavier will make a slight difference.

  • Cornersteady
    Cornersteady Club Member Posts: 14,431 ✭✭✭
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    edited January 2018 #35

    right got it!

    2235/65/17 means 235x0.65 = 152.75mm (distance from rim to road) which is just over 6 inches added to 17/2 gives a radius of 14.5 inches (axle to road?)

    235/60/18 means 235x 0.60 = 141mm which is 5.55 inches add 9 giving 14.55 inches

    and same for 235/55/19  gives 129.25 mm or 5 inches giving 5 + 9.5 = 14.5 inches yet again.

    So as the radius is the same more or less in all cases. Which is what you and others were trying to tell me as the radius stays the same the force from the supplied torque remains the same.

    Thanks you gentlemen, sorry for being slow on this

     

  • Cornersteady
    Cornersteady Club Member Posts: 14,431 ✭✭✭
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    edited January 2018 #36

    thanks for the reply.

    Yes the Niro looks good in appearance too and large enough for days out. Just to decide on the plug in or non plug in type?

  • G Cherokee
    G Cherokee Forum Participant Posts: 402
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    edited January 2018 #37

    I am also  in the process of hunting down a Kuga.

    Friend of mine has one, (the 163ps version) where I am looking for a 180ps. 

    He tows a twin axle caravan, his car has 19 inch rims with 255/55/R19 Cooper zeon LTZ tyres.

    In his words, awesome tyres, fantastic towcar, best I've ever owned.

    Cooper tyres are not cheap but they are quality, I run the cooper discoveries on my Jeep, they have done 7000 miles and still look new!

    Just remember if you start changing the wheel and tyre diameter, your speedometer will be incorrect. 

    Some of the aftermarket wheel websites give you a list of tyre sizes you can fit and a percentage of how much the Speedo is out.

  • G Cherokee
    G Cherokee Forum Participant Posts: 402
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    edited January 2018 #38

    Ps as a general rule of thumb tyres with a wall hieght of 50mm or less, is considered low profile is. 245/45/17 

    245 width in mm

    45 wall hieght in mm

    17 wheel diameter in inches

    I've never understood why people use a mixture of metric and imperial in this country!!???! 

  • Cornersteady
    Cornersteady Club Member Posts: 14,431 ✭✭✭
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    edited January 2018 #39

    Yes, I thought that too, and I wonder if I had to buy a tyre over there how are they labelled? 

  • G Cherokee
    G Cherokee Forum Participant Posts: 402
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    edited January 2018 #40

    Strangely, in the states, exactly the same as us!!!

  • alfigone
    alfigone Forum Participant Posts: 48
    edited January 2018 #41

    Not quite right... frown

    The example you quote I.E. 245/45/17, the 45 is the aspect ratio.  This is the ratio of the tyres width to it's tyre wall height

    So 45 = 45% of 245 in the example quoted the tyre wall height would be approx 110mm.

    There are loads of sites explaining tyre wall marking,

  • EmilysDad
    EmilysDad Forum Participant Posts: 8,973
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    edited January 2018 #42

    There have  been a few attempts to introduce metric tyres, eg MKII Granada. If you have metric rims, you'll have limited choice & have to dig deep as they tend to be very expensive. 

     

  • Cornersteady
    Cornersteady Club Member Posts: 14,431 ✭✭✭
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    edited January 2018 #43

    so what are cars sold in France, Italy, Germany.... are their tyres and wheels sold in metric diameters?

    If I needed a replacement tyre while abroad what happens?

  • EmilysDad
    EmilysDad Forum Participant Posts: 8,973
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    edited January 2018 #44

    The same mixture of metric width & imperial diameter 😉

  • flatcoat
    flatcoat Forum Participant Posts: 1,571
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    edited January 2018 #45

    The discussion about 19” wheels being heavier and therefore adversely affecting mpg might well happen in theory but given all the variables which affect economy I suspect it is a bit of a red herring. Tyre rolling resistance will and does have a far greater and measurable impact - my Audi A2 varied by 4mpg between best/worst and when I switched from Pirelli to Apollo tyres on the A6 the economy improved by 2mpg. 

  • huskydog
    huskydog Club Member Posts: 5,460 ✭✭✭✭✭
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    edited January 2018 #46

    I had a Mini Metro and XJ40 both with metric wheel rims ,but changed them for imperial rims when tyres needed changing 

  • EmilysDad
    EmilysDad Forum Participant Posts: 8,973
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    edited January 2018 #47

    I'd a feeling some BL cars of that era had metric tyres too. It was probably cheaper to replace the whole thing than just the metric tyre.

  • Graemebf
    Graemebf Forum Participant Posts: 22
    edited January 2018 #48

    Thanks everyone, it helped a lot but left the sales team a bit confused, looks are all. It’s a new Kuga and after all the evidence I read, it’s not what you think but the extra inch isn’t worth it. The dealers changed to 18” without a problem, after a test drive, so I’m a happy bunny and looking forward to getting the caravan on the back. Thanks again, even though folk wondered off the original question, still interesting though👍

  • ADD46
    ADD46 Forum Participant Posts: 437
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    edited January 2018 #49

    Thanks for the update graemebf and for posting such an interesting thread. Good luck with the Kuga. It's a joy to tow with. 😊

  • TonyBurton
    TonyBurton Forum Participant Posts: 269
    edited February 2018 #50

    We’re really pleased with our Kuga. It has 19 inch low profile wheels and intelligent AWD. It’s a great tow car. We’ve only towed across a waterlogged CL a couple of times and there was not a problem. You can set one of the displays to indicate the torque going to each of the 4 wheels through the AWD system. It’s surprising how often it kicks in giving a very smooth and reliable power train. At 33,000 miles I’ve just changed the front tyres. There was very little choice and I chose to buy some more Continentals as originally fitted by Ford. The cost for two was just under £400 but I could have chosen a cheaper brand for about £320. When we bought the car there was a cheaper version with 18inch wheels on the forecourt and although I thought they may be better off road I was persuaded to get the Titanium X sport because my wife liked the deep red colour!

  • lagerorwine
    lagerorwine Forum Participant Posts: 310
    edited February 2018 #51

    I would just add one comment regarding changing wheel sizes - make sure you inform your insurance and expect as difficult a discussion with them, as there has been regarding tyres on this thread.

    My previous Mk3  Mondeo was available in 3 different wheel diameters, 16, 17 and 18, depending on models. Mine had 225 x 18 x 40 tyres, which I found great for towing stability, and with the car loaded, it gave a more comfortable ride. When I bought some 17" alloys for non-towing comfort, the insurance classed it as a modification (as not factory fitted). 

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