Ritchey Stem Shim- adapts 31.8 to 28.6, 1-1/4" to 1-1/8
Forks with a 25.4mm (1") steerer can be used with stems with a 28.6mm (1-1/8") diameter and forks with a 28.6mm (1"-18") steerer can be used with stems with a 31.8mm (1-1/4") diameter thanks to the genuine Ritchey Stem Shim adaptor.