Hi guys. Name is Nathan. I've owned a CX500 for about 48 hours now. I'm loving the bike, but it has some old rubber on it that will need to be replaced soon. I am blessed to have a commute that most guys would kill for. 8 miles of highway canyon riding (~55mph speed limit) & 2 miles of tight canyon riding (~30mph speed limit). If you're familiar with the Denver area, it's Hwy 285 & North Turkey Creek. Obviously this bike will be spending a lot of time on the edges of the tires. I know this thing isn't a modern sport bike, but I'd like to set it up to handle as well as possible. I'm willing to sacrifice durability for better grip. Dual-compound would be nice, but I'm told there's none available. So my question is two-fold. What metric sizes should I be looking for to get the proper shape of tire on the rim? And what rubber would you recommend in that size? I should also note, the tires have to be able to handle some rain. The weather can change quickly around here. Thanks so much for taking the time to read/respond.