The Middleburn RS8 X-Type direct mount Uno spider & chainring with a thick/thin (TT) tooth profile is for use in 1x systems, and with the RS8 X-Type cranks.
The TT Uno’s are machined from 7075 T6 aerospace aluminium and then a hard coat anodising treatment is applied for maximum strength and wear protection.
The chain line is standard 50mm. Boost variations are also available!