Results 1 to 9 of 9

Thread: Changing wheel size/speedo question (Again - Sorry!)

  1. #1
    Mind that bus, what bus? Splat!
    Join Date
    Sep 2003
    Location
    Hertfordshire
    Posts
    1,440
    Thanks
    52
    Thanked
    21 times in 21 posts
    • Gr44's system
      • Motherboard:
      • Asus P5K Premium
      • CPU:
      • C2Q Q6600 G0 @ 3.68Ghz
      • Memory:
      • 4x1GB Crucial Ballistix PC8500+
      • Storage:
      • 2x 500GB Spinpoint
      • Graphics card(s):
      • 8800 Ultra
      • PSU:
      • Enermax 720w
      • Case:
      • Lian Li G70
      • Monitor(s):
      • 2x Dell 2408's
      • Internet:
      • Virgin 100MB

    Changing wheel size/speedo question (Again - Sorry!)

    Hi, I asked a question a while ago about putting larger wheels on a car, and how it makes the speedo out. You guys were very helpful and I was given a calculator to work out the differance in speed ( http://www.polo-gt.co.uk/mechanical/tyrecalc.html )

    But just to be a pain in the ass, I can't seem to find a near match in standard tyre sizes, eg: at the moment the car has 14" steels on it! ( 195/45/14 ) but if I want 16" or 17" wheels, I can't seem to find a standard size that would keep my speedo just under the speed, they all seem to be in excess of 8%, which I'm sure you'll agree is too much.
    So my question is, does anyone know the 'standard' tyre sizes you can buy, or do you know how if garages can get speedos changed or do something to make it show the speed correctly? I'd go into a garage, but I can't afford new wheels at the moment anyway, so thought i'd ask some people who won't rip me off

    Thanks for any help

  2. #2
    Rcb
    Rcb is offline
    F0rum Lurker
    Join Date
    Dec 2004
    Location
    West Midlands.
    Posts
    253
    Thanks
    0
    Thanked
    0 times in 0 posts
    You can get the speedo re calibrated.
    GA-7N400 Pro2
    XP 2800+
    2 X 512MB Kingston PC3200 ram
    Nvidia 6600GT

  3. #3
    www.5lab.co.uk
    Join Date
    Sep 2003
    Posts
    6,406
    Thanks
    1
    Thanked
    0 times in 0 posts
    just adjust the width by 5mm each way - should apply < 5% to the amount

    either that or you can normally get packages which replace a cirtain wheel/tyre setup.. just ask wherever you're buying the wheels from
    hughlunnon@yahoo.com | I have sigs turned off..

  4. #4
    F.A.S.T. Butuz's Avatar
    Join Date
    Jul 2003
    Location
    Wales
    Posts
    4,708
    Thanks
    51
    Thanked
    72 times in 59 posts
    • Butuz's system
      • Motherboard:
      • MSI Z77 MPOWER
      • CPU:
      • I7 3770K @ 4.6
      • Memory:
      • 16GB Corsair XMS 1866
      • Storage:
      • Sandisk SSDs
      • Graphics card(s):
      • 3xR9 290
      • PSU:
      • be quiet! Dark Power Pro 10
      • Case:
      • Inwin H Frame
      • Operating System:
      • Windows 7
    I can see your problem, your already on low profile rubber on your standard wheels, so going to big wheels doesnt allow you to lower the profile sufficiently to keep the original rolling radius.

    If you do want big wheels, your just gona have to get your speedo recalibrated. The larger rolling radius is going to make your acceleration slower in all gear, but your top speed in each hear higher.

    I wouldnt go more than 2" bigger wheels than where on as standard as anything more will affect the handling considerably on 90% of cars.

    Butuz

  5. #5
    Mind that bus, what bus? Splat!
    Join Date
    Sep 2003
    Location
    Hertfordshire
    Posts
    1,440
    Thanks
    52
    Thanked
    21 times in 21 posts
    • Gr44's system
      • Motherboard:
      • Asus P5K Premium
      • CPU:
      • C2Q Q6600 G0 @ 3.68Ghz
      • Memory:
      • 4x1GB Crucial Ballistix PC8500+
      • Storage:
      • 2x 500GB Spinpoint
      • Graphics card(s):
      • 8800 Ultra
      • PSU:
      • Enermax 720w
      • Case:
      • Lian Li G70
      • Monitor(s):
      • 2x Dell 2408's
      • Internet:
      • Virgin 100MB
    Ok, thanks for your help guys - interesting about the accel/top speed - didn't know that.

    Was looking at 15 or 16" - seen some people with 19"'s on my car, how crazy is that!

    Again, thanks all

    Sean

  6. #6
    F.A.S.T. Butuz's Avatar
    Join Date
    Jul 2003
    Location
    Wales
    Posts
    4,708
    Thanks
    51
    Thanked
    72 times in 59 posts
    • Butuz's system
      • Motherboard:
      • MSI Z77 MPOWER
      • CPU:
      • I7 3770K @ 4.6
      • Memory:
      • 16GB Corsair XMS 1866
      • Storage:
      • Sandisk SSDs
      • Graphics card(s):
      • 3xR9 290
      • PSU:
      • be quiet! Dark Power Pro 10
      • Case:
      • Inwin H Frame
      • Operating System:
      • Windows 7
    No probs.

    Btw - what car is it?

    Butuz

  7. #7
    Senior Member Shad's Avatar
    Join Date
    Jul 2003
    Location
    In front
    Posts
    2,773
    Thanks
    22
    Thanked
    40 times in 24 posts
    Are your current 14" wheels 6/6.5" in width? Fine if they are, but otherwise a 195 section tyre is way too big! This might be throwing out your calculations, maybe your speedo is already out...
    Simon


  8. #8
    Real Ultimate Power! Grey M@a's Avatar
    Join Date
    Oct 2003
    Location
    Newcastle
    Posts
    4,625
    Thanks
    52
    Thanked
    156 times in 139 posts
    • Grey M@a's system
      • Motherboard:
      • Gigabyte Z97X Gaming 7
      • CPU:
      • i7 4790K (With H100i cooling)
      • Memory:
      • Corsair Vengeance Pro 16GB DDR3 (2 x 8GB)
      • Storage:
      • Samsung 840 Pro 128GB SSD, 1TB Cavier Black WD HD, 4TB Cavier Black WD HD
      • Graphics card(s):
      • MSI R9 390X Gaming Edition 8GB
      • PSU:
      • SuperFlower Leadex GOLD 850W Fully Modular
      • Case:
      • Corsair 650D
      • Operating System:
      • Windows 8.1 Pro x64
      • Monitor(s):
      • 24" LG 24GM77-B 144Hz
      • Internet:
      • 100MB Virgin Media Cable
    Thats a good point, do you know your speedo is correct in the first place? I know mine when I bought the car new, clock says I am doing 30mph gps certified show's that it was doing 26mph and it gets futher and futher out the faster I go. Thanks for the link though as I am changing from 15's to 17's

  9. #9
    Mind that bus, what bus? Splat!
    Join Date
    Sep 2003
    Location
    Hertfordshire
    Posts
    1,440
    Thanks
    52
    Thanked
    21 times in 21 posts
    • Gr44's system
      • Motherboard:
      • Asus P5K Premium
      • CPU:
      • C2Q Q6600 G0 @ 3.68Ghz
      • Memory:
      • 4x1GB Crucial Ballistix PC8500+
      • Storage:
      • 2x 500GB Spinpoint
      • Graphics card(s):
      • 8800 Ultra
      • PSU:
      • Enermax 720w
      • Case:
      • Lian Li G70
      • Monitor(s):
      • 2x Dell 2408's
      • Internet:
      • Virgin 100MB
    Aheam, I read the tyre size at night, with a led keyring - was abit off!

    It's 165/65/14 ( should double check that again mind, was early this morning when I was de-icing the car I noticed.

    Man I'm such a n00b with cars

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Newbie question about changing graphics cards?
    By YorkieBen in forum Graphics Cards
    Replies: 3
    Last Post: 16-02-2005, 12:51 AM
  2. Quick SATA drive question...
    By Nick in forum PC Hardware and Components
    Replies: 5
    Last Post: 03-02-2005, 04:07 PM
  3. The 78th Annual Hexus Quiz!
    By Stewart in forum General Discussion
    Replies: 19
    Last Post: 23-01-2005, 02:05 PM
  4. Find me a new steering wheel
    By Lowe in forum Automotive
    Replies: 27
    Last Post: 05-10-2004, 04:38 PM
  5. Fans - newbie question (hides in embarrassment)
    By spindle in forum Chassis and Mods
    Replies: 13
    Last Post: 28-04-2004, 02:20 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •