We love the high-density compound in the Pr1mo Sentinels, which is specially formulated to mimic a properly inflated pneumatic (air tube) tire so the wheel still rolls efficiently and comfortably.

SPECIFICATIONS

Sizes 22" in (501), 24" (540), 25" (559), 26" (590)
Width 1"
Color Black
Tread Smooth/grooved
Puncture Protection Solid tire (no tube required)