G-Sport Ribcage Rim material: 6061-T6 aluminum diameter: 20 inch width: 36mm height: 18mm ERD: 389mm (effective rim diameter) lacing: cross | offset spoke hole spokeholes: 36 color: cyan rain additional information: rim uses internal re-enforcement to keep spokes from pulling through while supporting the nipples holes are drilled and re-enforced for cross-spoke lacing other walls are extra thick to protect against case dents