Bigger Tyres Question...

Discussion in 'Wheels & Tyres' started by KombiKommando, 13 Aug 2018.

  1. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map
    Going from 215/65/R16 to 225/70/R16. How much will this raise my roof hight on my standard suspension kombi???

    (Thinking about those pesky hight barriers.......)
     
  2. xpfloyd

    xpfloyd Senior Member T6 Guru

    Map
    If my calc is correct it will increase the side wall height by 18mm so 36mm overall. It is 6am though and I’ve not had coffee so might have done that wrong.
     
  3. Loz

    Loz California 204 DSG 4Motion MY17 VCDS User Admin Moderator VIP Member

    Map
    Bookmark this; Tyre Size Calculator

    D7189EC1-F75B-483E-A330-EA2B33B2ACD0.jpeg

    As you only have the 16inch brakes, personally I think this is too big a difference and will affect your braking, But this is your choice.
     
    KombiKommando likes this.
  4. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map

    What size do u suggest buddy? I'm going down the swamper route... any advice would be great fully received.
     
  5. Dellmassive

    Dellmassive 204 T32 DSG LWB SPORTLINE PV MY18 VCDS User Moderator VIP Member T6 Guru

    Map
    Am I missing something?
    He's going from a 65mm sidewall to a 70mm side wall..

    So the van would sit 5mm higher. Due to the additional 5mm rubber between the floor and the lower edge of the wheel rim? Push in the chassis up 5mm.
     
  6. Tourershine

    Tourershine Senior Citizen VIP Member T6 Legend

    Map
    The profile number is the percentage of the width, not the size in MM.
     
  7. Loz

    Loz California 204 DSG 4Motion MY17 VCDS User Admin Moderator VIP Member

    Map
    Correct, sidewall is percentage of width.
     
  8. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map
    According to the tyre calc I will raise about 9-10mm?? Why will it affect my braking??
     
  9. Loz

    Loz California 204 DSG 4Motion MY17 VCDS User Admin Moderator VIP Member

    Map
    The general advice is max 3% but a more aggressive tread pattern that runs down the side wall a bit like new BFG's will help give the look of larger tyre.
    Some of the more aggressive tyre patterns are not speed rated but again its your choice.
     
    KombiKommando and Tourershine like this.
  10. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map
    Cheers buddy! Mmm what a quandary! Now I'm thinking stay with 215/65/R16 but just go for the more aggressive tread pattern..... mmmm. Decisions decisions.... what y'll think?
     
  11. Tourershine

    Tourershine Senior Citizen VIP Member T6 Legend

    Map
    Here's a set of 16" steels I did on knoblies to give you an idea on how they look.

    Same size as your originals.


    Screenshot_20180813-091018_Gallery.jpg
     
    KombiKommando likes this.
  12. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map
    Lovely lovely! Thanks for pic buddy!! They look bigger don't they. Cool. What's your thoughts on the tyre pattern? And noticeable driving differences? (Noise, performance)
     
  13. Tourershine

    Tourershine Senior Citizen VIP Member T6 Legend

    Map
    No idea.
    I spent a day refurbing the wheels, that I'd spent another day fetching, and then fitting tyres to then learn my 204 has brakes that are meant to stop a boeing 747, so they didn't fit.
    They did look very chunky against the side of the van if that helps.
     
    KombiKommando likes this.
  14. Dellmassive

    Dellmassive 204 T32 DSG LWB SPORTLINE PV MY18 VCDS User Moderator VIP Member T6 Guru

    Map
    The wheel size is.

    215/65/R16

    So 215mm wide / 65mm height / 16 inches rim diameter

    The letters before and after are special demoniators like load and speed rating etc
     
    ei-aprilia likes this.
  15. xpfloyd

    xpfloyd Senior Member T6 Guru

    Map
    No.

    215mm wide / 65% of width high / 16”

    The second number is a %, not mm
     
  16. KombiKommando

    KombiKommando Senior Member T6 Pro

    Map
    Correct. That why I was trying to figure out just how much a /70/ side wall would lift my van.... lol
     
  17. xpfloyd

    xpfloyd Senior Member T6 Guru

    Map
    Just re-checked my first post and I made a slight mistake (I doubled the increase but realised now that I have woke up you only need to include it once)

    215/65/16 = 215x65% = 139.75mm side wall
    225/70/16 = 225x70% = 157.5mm side wall

    Therefore your van will sit 17.75mm higher than before.

    According to willtheyfit.com the speedo error will be -4.92% which is within the advised 5% so that is ok too. I dont see an issue with you making that switch. Not sure what the braking issue would be as its the same rim and it currently fits over your brakes.
     
  18. Loz

    Loz California 204 DSG 4Motion MY17 VCDS User Admin Moderator VIP Member

    Map
    If you increase the overall diameter the braking force required to stop is increased, not the ability to fit the wheels over the brakes..
     
  19. xpfloyd

    xpfloyd Senior Member T6 Guru

    Map
    The increased diameter will mean that the van is going faster than the speedo is indicating but the ability to stop should not be affected i.e. the speedo says 70mph but the van is actually going 5% faster so 73.5mph. The van will be able to slow down the same way it would as if you were travelling at 73.5mph on the orignal tyres. Yes the braking force is greater as you are travelling 5% faster than indicated but its not exactly out of spec. If you had the original tyres on and were travelling at 80mph it would be greater still.
     
  20. Loz

    Loz California 204 DSG 4Motion MY17 VCDS User Admin Moderator VIP Member

    Map
    It's basic physics, the greater the lever the greater the force applied.. That is why all the tyre comparison sites recommend staying within 3.5% of original size for braking and gearing etc.

    Speedo error is just another artifact of going bigger..
     
    andys likes this.

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