User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 9 of 9

Thread: 19" to 18" wheels !

  1. #1
    Regular Member Kcs's Avatar
    Join Date
    Feb 2007
    Location
    Tamworth
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default 19" to 18" wheels !

    Hi all, can any one tell me if i need to get the engine re-calibrated if i down size from 19" wheels to 18" ? ive been told the speedo and mpg computer might be out !
    many thanks and Merry Xmas

  2. #2
    Regular Member ditchp's Avatar
    Join Date
    Jan 2007
    Location
    The world famous city ground
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Vectra cdti estate

    Trim : Get a

    Engine : Dirty diesel

    Year : 2006

    Default

    as long as the rolling radius is the same, then all will be ok, i have 225/45/17 on my car and standard was 16" ( sorry forgot tyre sizes).....

    there is alway's a little speedo error as my speedo say's 30mph and the sat nav say's 28 mph
    Midlands Mod Shop - NFFC.

  3. #3
    Regular Member Whoosh's Avatar
    Join Date
    Aug 2006
    Location
    North East
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats






  4. #4
    Regular Member leeds vectra's Avatar
    Join Date
    Jun 2005
    Location
    Leeds
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Insignia

    Trim : VX-Line

    Engine : BiTurbo

    Year : 2014

    Default

    Quote Originally Posted by Kcs View Post
    Hi all, can any one tell me if i need to get the engine re-calibrated if i down size from 19" wheels to 18" ? ive been told the speedo and mpg computer might be out !
    many thanks and Merry Xmas
    Your Dealer can do it via tech2. I had mine done when I went from 17's to 18's.

  5. #5
    Regular Member Kcs's Avatar
    Join Date
    Feb 2007
    Location
    Tamworth
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Thanks for help, tyresizer was very helpfull.
    cheers

  6. #6
    On a Sabbatical VauxVeteran's Avatar
    Join Date
    Mar 2006
    Location
    Nicking Ya Dinner.
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Sat Nav never lines up with the speedo, mine says 66mph when the speedo reads 70mph. hth.

  7. #7
    Regular Member dave-g's Avatar
    Join Date
    Dec 2007
    Location
    durham
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Most speedo's actually display slightly faster than you are doing.

    Thats why all traffic police vehicles have to get specially calibrated speedo's.

  8. #8
    Regular Member Whoosh's Avatar
    Join Date
    Aug 2006
    Location
    North East
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    I replaced 215/50 with 225/45 2.5% difference in rolling circumference
    Independent Sat Nav checks show speedo under reads by 7%
    That's why your on-board sat nav does not show actual speed...it would always be diferent from your speedo, which by law can under-read by up to 10%

  9. #9
    Regular Member Maverick's Avatar
    Join Date
    Jun 2005
    Location
    Leicester
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    If you have 235 35 19's as standard, the correct size to go for in 18" is 225 45 18"

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. "Winter" Wheels ? Are 19" Snowies best for the "Summer" ?
    By Woody in forum Vectra C / Signum Car Chat
    Replies: 21
    Last Post: 5th October 2012, 18:43
  2. Correct O.E tyre sizes for 18" & 19" wheels
    By ROCKATANSKY in forum Vectra C / Signum Car Chat
    Replies: 7
    Last Post: 28th July 2010, 09:26
  3. LXY Haines 19" or 18" Alloy Wheels on a Vectra
    By nickabbott2008 in forum Styling
    Replies: 6
    Last Post: 27th May 2009, 22:15
  4. Powder coating wheels...."some pics"
    By Big Davie in forum Vectra C / Signum Car Chat
    Replies: 16
    Last Post: 22nd September 2006, 09:52

Visitors found this page by searching for:

Nobody landed on this page from a search engine, yet!

Bookmarks

Posting Permissions

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