O-rings for tubeless wheels/Terra rims are made of ozone-resistant polyisoprine rubber. O-Ring No. OR20JM Highway. Rim Size: 20". Sold by the each.
2013 Master Catalog: Page 727
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The O-ring did not work
By willy
from Martinez, CA
Comments about One OR20JM Highway O-Ring (rim dia. 20''):
It dit not work