广州市虚数空间科技有限公司
guǎng zhōu shì xū shù kōng jiān kē jì yǒu xiàn gōng sī
Guangzhou, Guangdong
Drivetrain specialist building ultra-light cassettes, crank arms and hollow carbon chainrings. Its MK2 cassette pairs CNC steel cogs with a 7075 alloy largest cog for about 160g in 11-30T, offered with either a DLC coating for the lowest friction or PVD for wear resistance.