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  1. #1
    DALE_AVANT's Avatar
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    Question 245/40/18 tyres - OK to run on the rear?

    Hi guys.

    Would 245/40/18 tyres be fine for the rear on my Avant Sport? I have two spare so I may as well use them if I can.

    Many thanks

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  3. #2
    pink.teg's Avatar
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    Wat size rims are they
    ???
    Quattro Jam B12 suspension kit ,Custom Droplinks F/B , HID 6000, 18" RS4 Alloys, summer AMG's .
    RS6 for Show's .Cat gone for walkees, sports six padded clutch DMF
    Remapped 173BHP///278lbft, RS4 F/R ARB's , happy with that ........

  4. #3
    DALE_AVANT's Avatar
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    Quote Originally Posted by pink.teg View Post
    Wat size rims are they
    ???
    8J x 18".

    ET43.

    The width should not be an issue but I think the rolling radius will be out a little

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  5. #4
    quattrojames's Avatar
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    Rolling radius shouldn't matter on the rear, assuming your car isn't a quattro.
    Ingolstance Read about my A6 HERE.

  6. #5
    DALE_AVANT's Avatar
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    Quote Originally Posted by quattrojames View Post
    Rolling radius shouldn't matter on the rear, assuming your car isn't a quattro.
    Nah it FWD. I meant in relation to space in the rear arches over bumps and such

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  7. #6
    pink.teg's Avatar
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    In that sence ... No problems
    i have a Quattro
    and have 234/40/18 on front
    245/40/18 on rear and it's fine
    was on RR and the bloke that set up my map asked !
    and said the read out was fine !!
    Quattro Jam B12 suspension kit ,Custom Droplinks F/B , HID 6000, 18" RS4 Alloys, summer AMG's .
    RS6 for Show's .Cat gone for walkees, sports six padded clutch DMF
    Remapped 173BHP///278lbft, RS4 F/R ARB's , happy with that ........

  8. #7
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    245 is the width of the tyre and will not have any effect on the rolling radius, 40 profile is right for 18" wheel, you should be fine with these, it's only 10mm wider than a normal 235....
    03MY 52 reg 1.9 TDi 130PS Quattro Sport Avant - 170bhp remap, RNS-E+OEM bluetooth, B7 wiper arms/blades, 4300K HID+nightbreakers/LED sidelights, rear tints, new lights all round, new front/rear screens, frt armrest, s-line kit, cruise/DIS, B7 gearknob/aluminium trims, parking sensors, black grilles, RS4 RARB, S4 front end, black 18" RS6 alloys

    Still waiting..... S4 rear bumper, exhaust tips, coilovers, leather recaro's.... phew...

  9. #8
    DALE_AVANT's Avatar
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    Quote Originally Posted by jbcalvin View Post
    245 is the width of the tyre and will not have any effect on the rolling radius, 40 profile is right for 18" wheel, you should be fine with these, it's only 10mm wider than a normal 235....
    245/40 has a larger rolling radius than 235/40, as the 40 represents a percentage of the 235/245.

    So 40% of 245 = a bigger overall tyre than 40% of 235 (iirc)

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  10. #9
    PetrolDave's Avatar
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    See the tyre size calculator here Cheap Low Price Special Offer Alloys and Tyres from TYRESAVE

    235/40 x 18 has an overall diameter of 245mm, but 245/40 x 18 has an overall diameter of 653mm, i.e. 8mm or 1.24% larger.
    2006 RS4 Avant (Phantom Black), RNS-E (2010 version inc SDS, HW 070, SW 0220) with AMI (250GB hard disk), Bluetooth + iPhone 5

  11. #10
    BahnStormer77's Avatar
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    Quote Originally Posted by pink.teg View Post
    In that sence ... No problems
    i have a Quattro
    and have 234/40/18 on front
    245/40/18 on rear and it's fine
    was on RR and the bloke that set up my map asked !
    and said the read out was fine !!
    FWD should be fine to run different rolling radius tyres, but you are putting a lot of completely pointless strain on the quattro differential by doing what you're doing... it'll run fine on RR or on the road, but it just works the differential constantly...
    LostBok/BahnStormer77
    A6 (C7) Avant 3.0TFSI, DSG, rain and light sensor pack, LED headlight pack, MMI touch, SDS high, AMI, 360deg sensors + auto-park, Dunlop SP Winter Sports / Pirelli P Zero's.

  12. #11
    pink.teg's Avatar
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    will wack the 235's back on ASAP then

    Cool save them for the dry summer days ...
    Quattro Jam B12 suspension kit ,Custom Droplinks F/B , HID 6000, 18" RS4 Alloys, summer AMG's .
    RS6 for Show's .Cat gone for walkees, sports six padded clutch DMF
    Remapped 173BHP///278lbft, RS4 F/R ARB's , happy with that ........

  13. #12
    BahnStormer77's Avatar
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    other thing to bear in mind for anybody who's got FWD and wanting that hot-rod stnad with slightly chunkier tyres on the rear... it may seem really obvious, but wider tyres = more grip... so the back will grip more and increase understeer...

    One of the later model Polo GTI's (2008?) has NARROWER tyres on the back to give the car a more neutral balance on the limit
    LostBok/BahnStormer77
    A6 (C7) Avant 3.0TFSI, DSG, rain and light sensor pack, LED headlight pack, MMI touch, SDS high, AMI, 360deg sensors + auto-park, Dunlop SP Winter Sports / Pirelli P Zero's.

  14. #13
    quattrojames's Avatar
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    Quote Originally Posted by lostbok View Post
    One of the later model Polo GTI's (2008?) has NARROWER tyres on the back to give the car a more neutral balance on the limit
    I 'think' RS3's do too.
    Ingolstance Read about my A6 HERE.

  15. #14
    DIESEL DOG

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    Will 245/40/18 on 8j et 43 go on the avant sport front and rear as i have a full set from an a6 but unsure if they will fit.
    Grey A4 Avant Sport B6 1.9 TDI

  16. #15
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    Quote Originally Posted by avantsport View Post
    Will 245/40/18 on 8j et 43 go on the avant sport front and rear as i have a full set from an a6 but unsure if they will fit.
    they'll be about 2% bigger (RR / circumference ) than standard 215/55/16 baseline

    Tyre Calculator - Alloy Wheels - Specialist supplier of alloy wheels and tyres packages, Fast Delivery, Buy Online.

    gives you loads of option for tyre width / size.

    don't know about width (+5mm both in and out) but if people are running spacers and 35 et's then the ouside 'rim' shouldn't be a problem

    don't know about the 5mm nearer inner wheel liner though.

 

 

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