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Wheels not fit for purpose: yes/no????

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  • vincenz
    vincenz Posts: 84 Forumite
    quoia wrote: »
    But that is the point - THEY SHOULDN'T !!

    Yes the hole in the middle changes size and gets bigger with a larger wheel size, 15" hole for a 15" rim, 17" hole for a 17" rim, BUT the outer diameter of the tyre SHOULD NOT CHANGE !!
    Otherwise the gearing ratios of the car are affected and more importantly the speedometer is calibrated for a tyre of a specific circumference and if this changes the MPH reading is inaccurate.
    Not so bad if you go the "right" way, so it reads 60 mph when you're actually only doing 50 mph, but do it the "wrong way" so you ARE doing 60 mph and it only says 50mph and you're going to get your picture taken or stopped by the men in blue.

    Putting the old 15" tyre alongside the new 17" one there should be no or very little difference in size.

    I've seen cars with 14" rims have them replaced with 18" ones and there is no issue at all with them fitting, because on the 14" wheels the tyres are about 5" thick making the outside diameter 24".
    On the 18" wheels the tyres are only 3" thick making the outide diameter 24"

    Less metal + more rubber = more metal + less rubber

    If you tell me exactly what size tyres it used to have fitted (should be in the handbook if you don't know) and what is fitted at the minute, I'll confirm if it is correct.
    The information I need is something like 195/65 R 15 or 195/55 R 17

    Yeah all what you have to remember is that the value after the width i.e. 65 means the sidewall is 65% of the width. So for a 15" wheel with 195/65 tyres the whole diamater would be ~508mm

    (15" x 2.54 + 195x0.65)

    and as so often happens with these tyre after market rims the wider the rim and accompanying tyre the bigger the profile. A 17" 205/45 tyre will have a bigger diameter than a 17"/195/45 tyre (i dont know if they do that size but just for arguments sake)
    Obviously the problem is that its a wider wheel than before hence the scraping against the arches due to fitment of spacers.

    To the OP i'd certainly get the tyres changed as they are being exposed to conditions they are not designed to operate in.
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