Torque Cars

Low or hi profile's ?

Discussion in 'General car Chat' started by yankfan101, 12 June 2016.

  1. yankfan101

    yankfan101 Torque Junkie

    Messages:
    177
    From:
    Taplow
    Car:
    1987 Range Rover
    Why do people fit massive rims & low profiles or the other side of the coin, smaller rims & higher profiles.
     
  2. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    1. Appearance and (if they're lucky) improved roadholding and handling. They should remember that car makers do know a thing or two about suspension design, of which rims and tyres are an inclusive part.

    2. People as in car makers do this as it's generally cheaper than lower and wider alternatives. There have been plenty of great handling cars though on modest rims and tyres. Nissan's Primera was phenomenal on 185/65 14 steels - decent tyres of course, not budget ones. Peugeot's base model 405 (1987) was on 165 width on 14" rims. It set a new standard for midrange family car handling and ride. Not many modders take the route of smallers wheels.
     
  3. yankfan101

    yankfan101 Torque Junkie

    Messages:
    177
    From:
    Taplow
    Car:
    1987 Range Rover
    If the gearing's right then small means fast, look at F1 or top fuelers.
     
  4. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    I was thinking of keeping the rolling diameter notionally the same thus not changing overall gearing by more than about 1-2% either way.
     
  5. yankfan101

    yankfan101 Torque Junkie

    Messages:
    177
    From:
    Taplow
    Car:
    1987 Range Rover
    if wheels were kept to a max of 17" with 40 profiles, then that would suit all.
     
  6. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    How do you propose that would work? It's easy to set a notional and arbitrary bar. Would that autonomously fix the overall gearing? No.
     
    Last edited: 13 June 2016
  7. SLEEPER

    SLEEPER Pro Tuner

    Messages:
    2,782
    First of all you cannot just transfer something from F1 top fuel cars to road cars (or to each other )
    In F1 the sizes are determined by very strict regulations. In top fuel there is only one - grip.

    The tyres run mostly on completely different surfaces SO the "performance required" In both means the compounds used bear little resemblance to road tyres which in tern means the tyres are equally different.
    the wheels and tyres are also designed for the car. Cant see a mini with 17" tyres working too well.

    back to roadcars - low profile tyres are perfonmance based - smaller wall less flex . As most cars are not set totally for handling lower profile tyres often can improve things. Of course the suspension set needs to be taken ito account.

    I think that this is more relevant to older cars as current sports cars are pretty well sorted.
     
    Lunchmoney, HDi fun and T9 man like this.
  8. old-git

    old-git Moderator

    Messages:
    9,182
    From:
    Essex
    Car:
    Elan & Robin Hood
    F1 uses 13" wheels because the rules say so. The diameter of the wheel has no influence on speed, that is dictated by tyre's diameter.

    Top fuel dragsters use small wheels so that they can fit large, flexible walled, tyres. Again, the wheel diameter has no direct influence on speed.

     
  9. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Agreed. whether it's 13" metal and 10 inches of sidewall or 22" metal and 1" sidewall the rolling radius is identical.
     
  10. yankfan101

    yankfan101 Torque Junkie

    Messages:
    177
    From:
    Taplow
    Car:
    1987 Range Rover
    I had a caddy servile , 76-77, near as damb it 425 hp, after id re-built the eng & inject sytem I couldn't figure out why it was bouncing & rollin' at the back end, the side walls of the Pirelli 6000's were not strong enough so I stuck on a set of Merc sprinter tyres, cured the prob but whited out all the time, very strong walls, lack of grip, great fun though.
     
  11. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    I am always puzzled why Pirelli's P6000 is still available. It's an early 90's pattern. Pirelli itself has far better tyres available now.
     
  12. yankfan101

    yankfan101 Torque Junkie

    Messages:
    177
    From:
    Taplow
    Car:
    1987 Range Rover
    Yep, it was the early 90's. But now it's 215.80.16's for the Classic.
     

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