Century Ride Fueling & Hydration: The 100-Mile Protocol
A century burns 3,500–5,500 kcal. Nobody has that in liver and muscle glycogen. Ride nutrition is the difference between finishing strong and blowing up at mile 80.
The Numbers
- Carbs: 60–90 g/hour for most riders. 90–120 g/hour is possible with gut training and a 2:1 glucose:fructose ratio.
- Fluid: 500–1,000 ml/hour depending on temperature and sweat rate.
- Sodium: 500–1,000 mg/hour. Heavy sweaters and hot conditions: up to 1,500 mg/hour.
- Caffeine: 3–6 mg/kg total, split across the ride.
Pre-Ride (24 Hours Out)
- Carb-load: 8–10 g/kg carbs on the day before. Not a single pasta binge — spread across breakfast, lunch, dinner, and snacks.
- Sodium pre-load: extra 3–5 g sodium in the 24 hours before (salted foods, broth, an electrolyte drink at dinner).
- Sleep, foam roll, don't try new gear.
Race Morning
- 3 hours out: 1.5 g/kg carbs (oatmeal, banana, honey, coffee).
- 60 min out: 500 ml electrolyte drink, 200 mg caffeine.
- 15 min out: Small gel (25 g carbs) with sip of water.
On the Bike
Two-bottle setup: Bottle A is your carb+electrolyte mix (80 g carbs + 500 mg sodium per bottle). Bottle B is plain water for gels, cooling, and pill washing. Alternate.
- Miles 0–20: Sip Bottle A every 10 min. Small gel at mile 15.
- Miles 20–60: Keep sipping. Gel every 30 min. Second caffeine dose (100 mg) at mile 40.
- Miles 60–90: Add a real food option (rice cake, banana, PB&J bite). Third caffeine dose (100 mg) at mile 70.
- Miles 90–100: Sip only. Save the last gel for the final climb or sprint.
The Bottom Line
Never eat, drink, or supplement anything on race day you haven't practiced in training. Century performance is a fueling problem more than a fitness problem — solve it.
Frequently Asked Questions
- Can I hit 90–120 g carbs per hour without GI trouble?
- Only if you've trained your gut. Practice at your race pace with race products for 6–8 weeks before targeting elite carb rates. Start at 60 g/hr, add 10 g every 2 weeks. Use a glucose:fructose blend (2:1 ratio) for higher intake tolerance.
- What about salt tablets vs sports drink sodium?
- Salt tabs are for very high sweat losses (>1,200 mg Na/L) or when you need to reduce fluid volume. Sports drink sodium (400–800 mg/L) covers most riders. Combine both for hot day centuries with heavy sweaters.
- How much caffeine should I take?
- 3–6 mg/kg total across the ride, split. 200 mg pre-ride, 100 mg at mile 40, another 100 mg at mile 70. Don't stack it late — you'll wreck post-ride sleep.
