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| D2 - Wheels and Tyres Refurbing, center caps, tyre brands, tyrefitters - discuss it here |
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#1
25th May 2011, 04:42 PM
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I have been told, "no cant do that mate"!!!!!!
Hello, I have just got hold of a 1998 S8 with 255/45/18's on the back and 245/45/18s on the front. The front's are now on the limit and need changing, I got hold of some nearly new tyres from a mate that does track day racing in a Toyota Soarer after he changed them for track tyres but they are 245 40 18s. I have been told by the tyre fitting place that he would not fit them as my car is 4x4 with traction control as they will nacker the gearbox/transfer box????? is this correct
or will they be OK to use. I also had a word with my local Audi place and they told me to buy 4 new tyres as my car should have 245 45 18s. Any advise will be greatly excepted. Thanks Mick 
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#2
25th May 2011, 04:59 PM
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Mick,
The commonly held belief is that rolling radius must be with 1% so you don't damage the quattro section of your transmission. You currently have 1.33% difference with your set up which you may just get away with. Switching to 245-40/18 will increase the difference to 3.71% smaller on the front and you are heading for a whole world of hurt. If you want to run a staggered set up then ensure the tyre's rolling radius is within 1%. I have a staggered set up on my projekt of 285/30-20 rear and 245-35/20 front. .07% difference, works fine. The arches are modified. Workable combinations and wheels for our cars is here. There is a good calculator here and lots more information besides. HTH
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#3
25th May 2011, 05:49 PM
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Thanks for the info.
Blimey, so there not just rubbery things on each corner there is science behind it.  So if I keep them all the same size on all four corners I guess that will be ok? The backs are nearly new so don't want to change them if I can help it. (255 45 18) so I will have to go and get some new 255's My mate with the track day car said about trying FALKEN tyres, are they any good bearing in mind it is a family drive not a track car and then only really used at weekends as I have a work van during the week.
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#4
25th May 2011, 06:35 PM
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Try to keep the same make / model of tyre on all four corners if possible. If not Falkens are a good mid range tyre.
__________________
Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
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