www.CVOHARLEY.com

CVO Technical => Wheels/Tires/Suspension/Brakes => Topic started by: grim on September 11, 2018, 11:04:51 AM

Title: rear tire
Post by: grim on September 11, 2018, 11:04:51 AM

Hi Springer Softails.  I just purchased a 2009 that is in need of tires, the book calls for a 240/55R18 and it has a 240/40VR18  Does this have much of a effect on the Speedometer?
Thanks

Title: Re: rear tire
Post by: grc on September 11, 2018, 02:31:16 PM

I can't find a listing on Dunlop's site for a 240/55 R18, only a 240/40 R18.  I also searched other brands and came up blank as well.  I wonder if that original tire spec in the owner's manual was incorrect.  The parts manual calls for part number 41688-08 (updated to revision A at  some point) and that part number translates to a 240/40 R18.

As for your question, if the stock tire really was a 240/55 and not a 240/40, there would be a big difference in overall diameter and circumference, which would alter the speedometer reading significantly.  For example, a 240/55 tire would have an approximate overall diameter of 28.4", while a 240/40 would have an approximate OD of 25.6". 

Jerry

Title: Re: rear tire
Post by: grim on September 11, 2018, 04:10:40 PM

It must be a misprint in the owners manual I just checked the service manual and it calls for a 240/40R18
Problem solved
Thanks
Jim

Title: Re: rear tire
Post by: TrAnc on September 12, 2018, 03:28:59 PM

Hey
There is an error in manual , same mistake on harley site manual , it says 240/55/18 . The correct is 240/40/18 , if you want you can fit 250/40/18 , it fits but will be quite tightely.
Greetings