The numbers that stop the bonk

Your body stores roughly 90 minutes of glycogen at race pace. Fuelling replaces what you burn before the tank hits empty. The targets:

Session length Carbs per hour What that means
Under 60 min 0–30g Water or electrolytes only — you have the glycogen
1–2 hours 30–60g Start fuelling at minute 20, not when you feel it
2–3 hours 60–90g 1:1 glucose:fructose lets you absorb past 60g/hr
3+ hours 80–90g Train your gut in the weeks before — see below

What 60g/hr actually looks like

  • One FTP taster pack per hour — each pack is 60g of carbohydrate. Set a timer: 3–4 pastilles every 15–20 minutes. No gagging on gels, no sticky wrappers.
  • Or split it: half a pack (30g) + one bottle of Power Fluids per hour — fuel and fluids in the same 500–750ml.
  • Heat rule: when it's above 20°C or you're a heavy sweater, add electrolytes to every second bottle.

Race-day templates

2-hour ride or long run (60g/hr)

0:20 — first 3 pastilles · then 3–4 pastilles every 15–20 min · 500–750ml fluid per hour. Total: 2 taster packs or ~120g from a 1kg bag.

Marathon (75g/hr for 3:30–4:30 finishers)

Fuel from the first drinks station. 4 pastilles every 15 min, alternate water and electrolytes. Total: ~250g — pre-portion into two pouches, one for each half.

Century ride / 100 miles (80–90g/hr)

Bottles do the heavy lifting: Power Fluids in both bottles (~40g each) + 4–5 pastilles per hour between refills. Refill at the halfway stop. Total: ~450–500g for a 5–6 hour day.

Gut training: the part everyone skips

  • Practise your race-day fuel rate on your two longest weekly sessions, starting 6 weeks out.
  • Build up: 60g/hr for two weeks → 75g/hr for two weeks → 90g/hr race simulation.
  • Never introduce new fuel on race day. Same brand, same doses, same timing you trained with.

Every number above is the protocol we fuel with ourselves — the same 1:1 glucose:fructose ratio in every FTP pastille and every scoop of Power Fluids.