I would like to put the wheels and tires from a 2007 Screamin Eagle Roadking on a 2007 FLHX. The front is 18"x3.5" with a 130/70 R 18 tire. The rear is 17"x4.5" with a 170/60 R 17 tire. I know the Screamin Eagle Roadking has a wider swingarm but there appears to be plenty of clearance for a 1 inch wider rim on my stock FLHX. I have read that 150/70 R 18 was the biggest tire you could put on the rear but I would be using a 17" rim not an 18" rim. Also If I used a slightly smaller tire on the rear could this combination be used? Any input would be appreciated.