I'm looking to replace my tires and been searching the forum for what others have done. My bike currently have some old dry rotted tires. The rear is a 120/90-18 which I plan on keeping the same size. My issue is the front the tire has 3.50/3.75 H18 and the rim has 1.85x18. I was looking to put a 100/90 18 on the front. Does this sound right?