The Excess XLC Alloy Rim (451mm x 19.5mm, 32H with Braking Surface) is a high-performance, double-walled aluminum race rim custom-engineered for BMX Mini, Junior, and Expert setups. Designed to optimize strength-to-weight ratios on the racetrack, this rear-specific profile features a dedicated CNC-machined brake track, explicitly optimized for linear-pull V-brakes or caliper rim pads.

Key Technical Specifications

Official architecture data points from BMX Racing Group (BRG) include:

• Sizing Standards:
  20" OS / fractionally-sized BMX race layout featuring a 451mm ETRTO diameter.
• Width Dimensions:
  19.5mm external width with optimized internal geometry, perfectly suited for standard 20" x 1-1/8" and 20" x 1-3/8" high-pressure race tires.
• Brake Configuration:
  Features a Machined Sidewall Braking Surface, with the brake track cleared of black anodization to guarantee instant, shudder-free pad friction.
• Structural Engineering:
  Extruded from 6061-T6 aluminum alloy with a low-profile aero shape. Incorporates custom angled nipple holes, allowing spokes to line up straight with the hub flanges, increasing wheel rigidity and eliminating nipple binding.
• Valve Drillings:
  Pre-machined cleanly for narrow Presta valves.
• Component Weight:
  264 grams.
• Effective Rim Diameter (ERD):
  438mm (Note: The baseline 451mm blank uses a 434mm ERD, but the 32H variant specifically lists a 438mm ERD for spoke calculation).
• Spoke Tension Boundary:
  Maximum recommended tension of < 115 kgf to protect the un-eyeleted alloy spoke beds.