Hello everyone, Just picked up a new (to me) 2000 drz400s. I'm a newb so please be patient. I need to get new tires and was going to order a 50/50 Kenda K270 set off bikebandit. My stock Trailwing tire size on the S is Front: 80/100-21 and Rear 120/90-18 Looking at the site, they have my front tire at 80/100-21 ok. However on the rear, the only one close is a 120/100-18 for the Kenda. Will this bigger size fit my bike and be safe/good to ride with?? Also should I balance the wheels as well since I'm doing street? Also, it shows an aspect size or something with 3.00/3.25 for the front and 5.00/5.10 for the rear. What is that? And are they the same or do I need to pick one of each of these as well?