A long climb that ends in a descent on cracked pavement tests a tire in both directions, and the Challenge Strada Pro Clincher Tire is a handmade road tire with a rounded profile that softens the hit of rough surfaces. SMARTprime tread compound rolls with lower resistance than Challenge's basic Smart rubber while holding traction and durability. A supple Super Polyester casing carries that profile and keeps the tire compliant over broken asphalt. What Our Gearhead(R) Experts Are Saying:"This tire runs on hooked clincher rims with a standard tube, so my existing road wheels needed nothing new. The pre-formed shape made mounting and inflating easy."