C5 X7 Tyre Options

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saxy
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C5 X7 Tyre Options

Post by saxy »

Hi all.....I know the correct tyre size for my 2010 X7 2.0 HDi 163 is 225/55/r17 but I have been offered a set of 5 brand new 225/50/r17 Avons for a ridiculous price from a tyre place that has just been bought out.....can I fit them or am I in for a world of pain if I do? Thanks for your advice everyone!
Justin
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darbuck
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Re: C5 X7 Tyre Options

Post by darbuck »

They are 17's they should be fine, they will be low profile and could be hard on the wheels on bad roads but should be ok. I am the opposite end of the scale to you I bought a pair of 225 60 17's for mine I'm hoping they won't be too big in the wheel arches. My mat has just fitted and balanced them but I have to pick them up.
Darren
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saxy
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Re: C5 X7 Tyre Options

Post by saxy »

Thanks Darren!
Justin
Jay-Bruce
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Re: C5 X7 Tyre Options

Post by Jay-Bruce »

Lads, both of your tyre sizes are only 3.3% out from stock, Darren's tyres are 3.3% larger than stock where as Sazxy's tyres are 3.3 smaller than stock.
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darbuck
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Re: C5 X7 Tyre Options

Post by darbuck »

No bother saxzy. Thanks Jay I think they will just about fit. I just hope they're not too tight in the wheel well. My mate still hasn't brought them into the job yet I'll let you know when I get them.
Darren
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darbuck
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Re: C5 X7 Tyre Options

Post by darbuck »

Well I can say with certainty they don't fit they bind on the wheel arches s have to take them off and sell them on🙄
Darren
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Re: C5 X7 Tyre Options

Post by Jay-Bruce »

Hi Darren, 225/60/17 tyres are only 3/8" or ~1cm larger in radius than the original 225/55/17 tyre size, so I'm really surprised they're catching. I'm also genuinely sorry if I accidentally led you down the garden path with my spreadsheet calculations.
PaulC5
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Re: C5 X7 Tyre Options

Post by PaulC5 »

I have not done any calcs but it appears using smaller diameter tyres the engine has to run at higher rpm for the same road speed (not indicated speed). This will result in worse fuel economy so any saving in tyre prices might be lost by using more fuel. It might also be classed as a mod for insurance purposes.
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darbuck
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Re: C5 X7 Tyre Options

Post by darbuck »

Jay-Bruce wrote: 08 Feb 2024, 16:04 Hi Darren, 225/60/17 tyres are only 3/8" or ~1cm larger in radius than the original 225/55/17 tyre size, so I'm really surprised they're catching. I'm also genuinely sorry if I accidentally led you down the garden path with my spreadsheet calculations.
Hi all, sorry just the later posts now. Not at all Jay I should have gone with recommendations there is about 10 mm clearance on one side and none on the highest point on the other side I think the wheel arch liner on that side is fitted wrong so I will see if I can refit it. If not I'll just have to take them back off and try and shift them on, lesson learned.
I haven't been able to get to the car with the weather. I spent all day yesterday and today putting engine and gearbox back in so on a roll hopefully.

Your probably right Paul on both counts but unfortunately heinseit doesn't allow for change to the original decision 😂.
Darren