Re: [Chrysler300] 14" to 15" - speedometer cable gear?

["George Cann" <grcann@xxxxxxxxxxx>]

Hi all.
A good tool for speedometer calibration is the portable GPS unit.
For either changing rim diameter or just changing from OEM to more modern tire,
 a very easy way to check speedometer accuracy.
Regards,
George Cann

  ----- Original Message ----- 
  From: Edward Mills Antique Tractors 
  To: 2HsandaHeritage@xxxxxxxxxxx 
  Cc: Chrysler 300 Club International 
  Sent: Thursday, June 30, 2011 12:45 AM
  Subject: Re: [Chrysler300] 14" to 15" - speedometer cable gear?


    
  Its not the wheels but the tires on the wheels - need to know the 
  circumference of tires. If you are changing from 14" to 15", you can 
  match dia fairly close.

  For example an original 8.50-14 would have been about 28.3 inch OD 
  (varies slightly by brand and grade). 9.00-14 would have been 28.6 to 
  about 28.8. Current P225/75R15 also shows 28.0 to 28.3 in. Current 
  P235/75R15 shows 28.6 to 28.9 in OD. Note that a well worn tire would be 
  about 16/32 or 0.5 in smaller or about 1.5 % difference on speedometer.

  Or if you already have tires and know you are 8% off, you can either 
  change tires or rear end gears or speedo gearing but if you are only 
  changing the 19 tooth gear, 1 tooth is a bit over 5%, 2 teeth is a bit 
  over 10% - so you probably need to look at tire dia / circumference too.

  On 6/29/2011 11:26 PM, 2HsandaHeritage@xxxxxxxxxxx wrote:
  >
  >
  >
  > Hi Group,
  >
  >
  >
  > When changing from 14" wheels to 15", what needs to be done to correct 
  > the speedometer/odometer readings?
  >
  > The plastic gear on the end of the speedometer cable that fits into 
  > the 727 on my H (15") is clear plastic and has 19 teeth.
  >
  > The same gear on my sport (14") is light blue and also has 19 teeth.
  >
  > The speedometer/odometer readings on my H are off by only 0.2%.
  >
  > The readings on my sport (with 15'' wheels installed) are off by about 
  > 8%.
  > Also both vehicles have a 323 rear end.
  >
  > Help!
  >
  >
  >
  > Doug Warrener
  >
  > [Non-text portions of this message have been removed]
  >
  > 

  [Non-text portions of this message have been removed]



  

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