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RS4 'what no spare'


RSmadman
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Makes for a far more secure jacking process, if of course you have a trolley jack. Dear Santa........

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Funnily enough, bought a tolley jack in the Summer (quite by chance) in Hellfrauds as I noticed an ex display one in their "sale" - not bad at something like £25 IIRC ! 169144-ok.gif

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Would you bloody believe it; I got a puncture today SAUER0421.GIF

I knew I shouldn't have posted on this thread.

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EEK2.GIFEEK2.GIFEEK2.GIF

you can't complain youve had a good run in the past aye.

but once you start they keep coming mind FIREdevil.gif

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Yup in threes.... Be afraid.... sekret.gif

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  • 1 year later...
  • 9 months later...
I have an Audi 17" spare wheel and "emergency spare" in the boot of my RS4 - that will fit the rear wheels only, so if I have a flat on the front I have to fit the space saver to the rear and move the full size wheel from the rear to the front.

A bit of a pain - but it does take up a LOT less boot space.

Wheel 8E0 601 027 C 03C (£62.78 + VAT from Southampton Audi)

Type Continental CST17 135/90 R17 103M (£51 + VAT from Denmead Tyres)

Hi Dave,

I also found another post by you in 2009 at " http://www.tyresmoke.net/forum/general-marketplace/117272-emergency-spare-wheel-tyre-audi-a4.html" post were you said: "Never used as a spare - it won't fit my RS4!

What specific problem did you experience in not being able to fit the spare wheel?

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What specific problem did you experience in not being able to fit the spare wheel?

Wouldn't fit over the rear discs, let alone the front discs!

Hence why I've been trying to sell the 17" rim to someone with an A4 or S4 - which it WILL fit - and now have an 18" rim which does fit over both the front and rear discs (I don't have ceramic front discs, which will only fit in a 19" wheel).

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Hi Dave,

I have a similar post on the South Africa Audi Club Forum and to close that one out posted your recommendation. One of the guys came back with the following:

"In my opinion you should never put one size smaller rim on the RS4 reason for this is because of the DRC, this could get messed up trying to adjust the lower pressure on the one side... DRC costs around R30000.00 to fix! And can easily be damaged but thats just my opinion I wouldnt take the chance..."

What's your opinion?

Thanks for the help.

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That is not as crazy an idea as it first appears ! When you bought new tyres did you buy 4 & rotate the "spare" ? Am thinking a spare at home could be a good idea although what about the "quattro has to have 4 even tyres theory" ?

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"In my opinion you should never put one size smaller rim on the RS4 reason for this is because of the DRC, this could get messed up trying to adjust the lower pressure on the one side... DRC costs around R30000.00 to fix! And can easily be damaged but thats just my opinion I wouldnt take the chance..."

Only a complete idiot would permanently run mixed wheel sizes - which is what I think this guy is talking about.

BTW rim size is NOT the concern, rolling radius is the concern - it's amazing how many people make this simple error. If the rolling radius is within 2-5% then by implication the distance from the ground to the axle must be withing a similar tolerance and hence the DRC cannot be affected.

If you have a catastrophic tyre failure (e.g. a blowout) in the middle of nowhere in a foreign country what would you rather do - fit an emergency spare, or wait to be recovered (at probably enormous expense)? That's my thinking...

For temporary use (an emergency spare is restricted to 50mph for 50 miles) I don't see there being any isues at all.

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Thanks Dave,

I already ordered and test fitted the wheel disc (1K0 601 027B 03C). It does not fit over the front calipher but does cover the rear. I will therefore make use of your suggestion to swop the rear with fronts if the need arises...

In deciding on the tyre I got the following information on different ride heights (wheel diameter) for different wheel dimensions, incl tyre compression when fitted:

255 35 19 - 661,10 mm

125 70 18 - 632,20 mm

145 80 18 - 689,20 mm

(All Continentals - BTW the ideal size would be 145 70 18 - 660,20 mm.)

This is either a positive or negative diameter delta of approx 28 mm which is a 4% difference (632/661=0.96 0r 689/661=1.04). Do you agree with this calc/reasoning?

By the way I agree with your sentiment, being stranded at night with wife and two kids does not sit well with me. Mpumalanga province in South Africa has a lot of potholes!

Kind regards

Paul

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In deciding on the tyre I got the following information on different ride heights (wheel diameter) for different wheel dimensions, incl tyre compression when fitted:

255 35 19 - 661,10 mm

125 70 18 - 632,20 mm

145 80 18 - 689,20 mm

(All Continentals - BTW the ideal size would be 145 70 18 - 660,20 mm.)

This is either a positive or negative diameter delta of approx 28 mm which is a 4% difference (632/661=0.96 0r 689/661=1.04). Do you agree with this calc/reasoning?

I had to go for the 125/70 18 since I couldn't source the 145/80 18.

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