So I have a 21x3.5 and a 18x3.5 on the way for my 08 ultra.. What size tire are you guys with this combo running on yours? I don't want to go too wide, that I have to worry about rubbing issues in the rear.. Thanks for the help.

 

120/70 21 front and 150/70 18 rear with no issues. Metzeler 880's.

 

thanks, is this the size everyone runs?

 

Seems pretty thin to me. That rear should be 5.5 or 4.25

 

Good call, with no issues is the key here.

 

And is your rear rim 3.5" wide?

 

Yep. 10k miles on the last rear tire. Riding curvy roads constantly.

 

I thought 08 and up were supposed to be 18x5.5 rear rim. My Bad.

 

150 on a 3.5 rim is very safe, I would not go any wider

 

My 08 has a 18x4.25 wheel and a 160 metzeler