Riding on the back wheel on all the proper climbs surely has negligible effect
The speed they're going it has plenty of effect.
The mental aid of being paced is also not something to be underestimated.
@Hovis 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.
Riding on the back wheel on all the proper climbs surely has negligible effect