05 1800, 215/45-18 ....any install tips?...seems huge, but the internet says it fits, so I have that going for me.....General Altimax RT43 205-65-16 radial on my 1800 C. 40 psi, Progressive 444 shocks. Ride-On gel internal balancer/ sealer, 2- 8 oz. bottles. 90* steel valve stem. Once the tire was mounted and aired up, I deflated it to get it up under the fender, then re-aired it. With the wheel off, excellent time to get rid of road debris, pitting, scuff, by sanding and or polishing.