Specifications

Bolt Circle Diameter (BCD): 107 mm (4-bolt).
Number of Teeth: 35 T (commonly paired with 48 T outer ring).

Compatibility:

SRAM RED eTap AXS BCD107×4
SRAM Force eTap AXS BCD107×4
SRAM AXS Power Meter BCD107×4

Groupsets: SRAM AXS 12-speed road systems (e.g., Red, Force, Rival).
Chains: SRAM 12-speed (Flattop) compatible.
Ovality: ~12.5 % change in effective radius through the pedal stroke.