Nashbar 26x1.5 Streetwise Mountain Tire. If your mountain bike spends all its time on the road, ditch those knobbies and throw on a set of these. Guaranteed to add speed, the Streetwise is a perfect choice for ripping through town on your daily commute or cruising for miles on the weekends.Nashbar 26x1.5 Streetwise Mountain Tire. If your mountain bike spends all its time on the road, ditch those knobbies and throw on a set of these. Guaranteed to add speed, the Streetwise is a perfect choice for ripping through town on your daily commute or cruising for miles on the weekends.