2.5 mm spacer for 41 mm press-fit (and Screw-Fit 41) bottom brackets (BB92 & SRAM)
This spacer is required for any frames with an 89.5 mm wide BB shell, unless using a 2.5 mm wide chain guide or BB mount derailleur

ID: 41.3 mm, OD: 44.3 mm, W: 2.5 mm