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Tyre Upgrade - Discussion

Discussion in 'Tyres & Alloys' started by Andy, Jun 18, 2010.

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  1. deba

    deba Amatore

    Messages:
    102
    Itanagar, Arunachal Pradesh
    itanagar
    Grande Punto 1.3
    Thanks buddy much appreciated.
    Last edited by a moderator: May 22, 2013
  2. moksh

    moksh Regolare

    Messages:
    351
    Mumbai/Germany
    Linea 1.3
    165/80-14 =0%
    175/75-14 =-0.24%
    185/70-14 =-0.81%
    195/70-14 =1.45%
    195/65-14 =-1.69%
    205/65-14 =0.4%
    215/60-14 =-0.97%
    225/60-14 =0.97%


    prefer this size

    go for 205/65 best size
    Last edited: May 22, 2013
  3. Fiat-Yamaha

    Fiat-Yamaha Superiore

    Messages:
    521
    Bangalore
    Isnt 205 overkill on a 14 steel wheels?

    I would say 185 is best and 195 to some extent(broad look).


    Sent from my GT-I9100 using Tapatalk 2
  4. Phew

    Phew Esperto

    Messages:
    1,109
    New Delhi/Mohali
    FASS
    Grande Punto 1.3
    Does the mrf/bridgestone come in this size ?

    @deba - Just don blindly go about calculating, try to find the brand and size balance first.

    Sent from my Samsung Galaxy s3 using Tapatalk 2
    1 person likes this.
  5. PatchyBoy

    PatchyBoy Esperto

    Messages:
    2,438
    Bangalore
    The 14" steel rim which now is mounted with 165/80 R 14 will most certainly be too narrow for 205/65. Upsize calculation is not just about width and profile. Please read the tyres and wheels section in the car bibles.

    Rajan
    Last edited: May 22, 2013
  6. gurjinder

    gurjinder Staff Member Janitor

    Messages:
    3,989
    Punjab
    185 / 70 /14 is pretty much the ideal combo on stock rims. Go for it. This setup is biased towards comfort and since we don't drive on Autobahns, comfortable tyres are the need of the hour.

    Change all 4 in one go.

    Cheers.
    2 people like this.
  7. moksh

    moksh Regolare

    Messages:
    351
    Mumbai/Germany
    Linea 1.3
    Well Calculation Is pretty much imp ,the speed,average,kms totally depends upon tyres. If you have more then +/-2 you would not see the perfrect avg,speed and kms.well i have give you list just see to it and choose size according to it .it should not exceed +2 or -2 .Try to get close to 0

    165/80-14 =0%
    175/75-14 =-0.24%
    185/70-14 =-0.81%
    195/70-14 =1.45%
    195/65-14 =-1.69%
    205/65-14 =0.4%
    215/60-14 =-0.97%
    225/60-14 =0.97%
    Last edited: May 22, 2013
    1 person likes this.
  8. PatchyBoy

    PatchyBoy Esperto

    Messages:
    2,438
    Bangalore
    @Moksh - We all agree that calculation is very important, but that is just one factor.

    Right now, the size is 165/80 R14. You have recommended 205/65 R14, based on these calculations, since the difference is 0.4%. Then why not 175/75 R14? That is only 0.24%, right?

    The present size is 165/80 R14.

    The recommended rim width for this size is 4.5 inches to 6 inches.

    Let us look at 205/65 R14.

    The recommended rim width for this size is 5.5 inches to 7 inches.

    Assuming that the current rim width is 6 inches (suitable for both), there is still a risk. A rim that is too narrow in relation to the tyre width will allow the tyre to distort excessively sideways under fast cornering. On the other hand, unduly wide rims on an ordinary car tend to give rather a harsh ride because the side walls have not got enough curvature to make them flex over bumps and potholes. That's why there is a range of rim sizes for each tyre size.

    Also, there is the issue of wheel well clearance. The tyre size you have recommended will definitely rub against the wheel well / suspension when cornering. While calculation of the difference in rolling radius and keeping it less than 2% is important, all we are trying to communicate is that there are other equally important factors. I have mentioned some of them above.

    Rule of thumb - Increase rim size by 1 inch, width by 20 mm and reduce profile by 10%. In this case, that would mean 185/70 R15, the difference being 0.31 %. If only this calculation was the deciding factor, one could get away with 335/40 R14 as well, considering that the difference is only 0.65%,right?

    This is a platform for learning. It is up to you to learn or to argue that you are right till the cows come home. The only person to whom it will make a difference is you.

    Cheers,

    Rajan
    1 person likes this.
  9. Phew

    Phew Esperto

    Messages:
    1,109
    New Delhi/Mohali
    FASS
    Grande Punto 1.3
    All aside.....in what brands are 205's available in 14" sizes. All this calculation is waste if you done have a product in that size.

    @Moksh - Pls suggest a brand that is selling the size you mentioned above

    Sent from my Samsung galaxy s3 using Tapatalk 2
    2 people like this.
  10. nkapoor777

    nkapoor777 Regolare

    Messages:
    467
    New Delhi
    Haha! Sat vachan bole ICE guruji converted into Tyre guruji!!
    Last edited: May 23, 2013
    2 people like this.
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