7400 covered the move from 6-8 speed, 7700 was 9, 7800 was 10 - so I reckon it's a strong chance of being 7400. The ratios will go well with the 52/43 rings.
@Dammit started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
7400 covered the move from 6-8 speed, 7700 was 9, 7800 was 10 - so I reckon it's a strong chance of being 7400. The ratios will go well with the 52/43 rings.