Stan's ZTR Arch EX rim combines the lightweight design of their race-specific rims with more internal reinforcements to create a super-strong, singletrack-ready rim. The Arch EX also uses Stan's BST technology for easy tubeless conversions, while its wide inner profile and lowered sidewalls boost tire volume for enhanced traction.
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I use these laced to Hope Pro11 hubs with a 15mm Maxle, the combination is first class for hard trail riding on my Commencal (5.5") The have been hammered and show no signs of problems at all. The rim weight is low giving great speed but with stiffness and strength.