On page 56 of the08 touring modelsowners manual is a interesting piece of information.
It says "ABS motorcycles must always use tires and wheels that are the same as the original equipment."
It goes on to say if you change to different size tires or wheel diameters you can upset the ABS calibration and it will not work the way it was designed.
Read the whole thing yourself and check it out with your dealer before you make any changes that might upset the ABS system.

 

This is the case with cars and trucks equipped with ABS as well. Slip threshold is calibrated to have a small buffer to account for noise. Different size tires can cause a speed difference greater than the buffer and cause false triggering. Not a good thing!

 

The only thing worse than a pissed off ABS system isa PMS system.....and we all know nobody likes to go there

 

I went with 20s on my truck and the ABS acts a little funny from time to time.

 

PMS system going through the change. Could be worse[:-]

 

Yes it says that in the book. It also says Never use after market parts on your Harley. Page 5 says don't operate with the forks locked. I didn't expect HD to say yes it ok to change wheel size. The sensor is in the bearings, after lots of checking I'm going to keep mine 21/18's

 

Damn I never read page 5 no wonder i can only go in circles.

 

thanks for the tip

 

That made me laugh!!

 

the change.... that made me laugh... kinda