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- High thread-count superpoly casing increases suppleness and reduces rolling resistance compared to Poly casings
- Includes PPS2, two layers of puncture protection with one special fabric placed between the tread and casing and another on the inside of the casing
- Open Tubular tire includes lightweight aramid bead for compatibility with ETRTO standard clincher bead rims
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700×36 CHALLENGE GRAVELGRINDER PRO OTBLK. High thread-count SuperPoly casing increases suppleness and reduces rolling resistance compared to Poly casings. Includes PPS2, two layers of puncture protection with one special fabric placed between the tread and casing and another on the inside of the casing. Open Tubular tire includes lightweight aramid bead for compatibility with ETRTO standard clincher bead rims.