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Winter rims

Discussion in 'RS3 Forum (8P & 8V Chassis)' started by tee-bee, Sep 14, 2013.

  1. tee-bee

    tee-bee Member

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  3. klauster

    klauster Well-Known Member

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    they look good, but remember you can run 18'' winters, which will save quite of bit of cash when it comes to the tyres
     
  4. JonnyG

    JonnyG Active Member

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  5. 45bvtc

    45bvtc Well-Known Member
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    And here's the ET explanation diagram for the original 19inch x 8J RS3 wheel again, just in case:

    [​IMG]

    So, if you're looking at 8J wheels with an ET of 35mm then the 68mm dimension (as shown in the diagram above) will INCREASE by 15mm (50-35) and the effect of which is that the wheel will stand 15mm further OUT from the hub i.e., 15mm CLOSER to the wheel arch = Ooops!

    Be VERY careful!
     
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  6. Mr_Freeze

    Mr_Freeze Well-Known Member

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    Professor, errrr I mean John :haha: what's the recommended et for 8.5 rims?

    Also do you think you could put a 8.5 on the rear with a 235 tyre?
     
  7. 45bvtc

    45bvtc Well-Known Member
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    Hey Neil, welcome home...

    Ok, we know that the 8J rim with a 235/35 does fit and has sufficient clearance (just) with 4/5 up.

    So lets do the math… :think:

    1) Overall 'fitted' width of a 235/35 tyre on an 8J rim is: 246mm (taken from ETRTO tables)

    The 'ET' of the 8J rim is: 50mm (taken from Audi wheel rim markings)

    So, 246mm divided by 2 = 123mm

    And 123mm minus 50mm = 73mm i.e., the distance from the mounting face to the outside edge of the as fitted tyre

    2) Overall 'fitted' width of a 235/35 tyre on an 8.5J rim is: 251mm (taken from ETRTO tables)

    The 'ET' of the 8.5J rim is: 53mm (taken from Audi wheel rim markings)

    So, 251mm divided by 2 = 125.5mm

    125.5mm minus 53mm = 72.5mm i.e., the distance from the mounting face to the outside edge of the as fitted tyre

    0.5mm MORE clearance Neil, you decide, it's very, very tempting… :yes:

    And until you asked the question, and I did the sums Neil, I didn't know that!

    What a can of worms you've opened Neil, a right Pandora's box I'll be bound… :meeting:



    And here's a wheel/tyre data diagram:

    [​IMG]
     
    #6 45bvtc, Sep 22, 2013
    Last edited: Sep 22, 2013
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  8. tee-bee

    tee-bee Member

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    Yea, unfortunately I've purchased a set of winter Vredestein tyres for my existing RS3 rotors (same like 45bvtc).

    Will be posting my shiny new brakes protected via POR-15 (thanks to 45bvtc again) as well.

    Will be looking for a set of summer 19" rims but the fronts at 8.5J come spring time...

    Cheers
     
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