Wow, thanks for all the replies, much more than expected.
I was actually thinking of putting the 25's if they would fit for sheer ground clearance reasons. (I have a 74 landcruiser and in it the taller tires obviousely give better clearance = less high centering.) I have a 15 tooth front sprocket that I was waiting to put on till I figured out the tires. currently it has 12/42 with 20x12x9 very tired shredders. I have plenty of pickup but would like a little more top end.
The ticking I guess I will have to live with. I wonder why yamaha seems to be the only manufacturer with the ticking option as standard feature.
(it actually started making a different noise, kind of like bell sounding ticking if that makes any sense, after going through Lots and lots of water in the form of a flooded air field.

Thanks again

 

My buddy put holeshot xct 22-9-11 rear and 23-7-10 front, I must say the rears look fairly large but he turns them pretty good. Not much of a slide, alot of hookup.