They do look quite narrow but I expect those are PDI longneck XL grips and I doubt the bars are narrower than drops or bulls and people often ride on the tops of those.
@IR 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.
They do look quite narrow but I expect those are PDI longneck XL grips and I doubt the bars are narrower than drops or bulls and people often ride on the tops of those.