What to Eat and Drink on a 100-Mile Bike Ride
Not a product review. A working hour-by-hour plan — carbohydrate, fluid and sodium targets for roughly five hours on the bike, and what that translates to on a shopping list.
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This is a planning problem, not a shopping problem
"What should I eat on my first 100-mile ride" is not really a product question. It is a scheduling question: what goes in, roughly how often, over four to six hours, so that hour four does not fall apart the way hour one never does.
The numbers below assume a moderate pace century — somewhere around 5-6 hours of riding time for many club riders — at a moderate carbohydrate target of 70-90g/hour. Faster riders finishing in 4-4.5 hours, or those pushing a genuinely high carb rate, should shift toward the upper end of every range.
Before you start: the meal that actually matters
The pre-ride meal tops up liver and muscle glycogen that the ride will draw down from the first pedal stroke. Eaten 2-3 hours before the start:
- 60-90g of carbohydrate, mostly from familiar, low-fibre foods — porridge, white toast with jam or honey, a bagel, rice pudding.
- Moderate protein, low fat and low fibre, to avoid slowing digestion or causing gut discomfort on the start line.
- 500ml of fluid with a pinch of salt or a weak electrolyte mix, finishing roughly an hour before departure so you are not queuing for a toilet at the start.
This is not the meal to trial something new. Use whatever has already worked before a long training ride.
Hour-by-hour plan
Ranges assume a rider in mild-to-warm conditions with an average sweat rate. Hot weather or a known heavy sweat rate should push sodium toward the top of the range — see best electrolytes for heavy sweaters to work out your own number rather than guessing.
| Time | Carbohydrate | Fluid | Sodium | Suggested source |
|---|---|---|---|---|
| Hour 1 | 40-60g | 500-750ml | 250-500mg | Easy pace, water plus a light electrolyte mix, maybe half a gel |
| Hour 2 | 60-80g | 500-750ml | 300-500mg | One gel or a rice cake, one bottle of carb drink |
| Hour 3 | 70-90g | 500-750ml | 300-500mg | Real food (banana, malt loaf) plus a gel |
| Hour 4 | 70-90g | 500-750ml | 300-500mg | This is where riders most often under-fuel — stick to the plan even if you do not feel hungry |
| Hour 5 | 60-90g | 500-750ml | 300-500mg | A high-carb gel or two, whatever has sat best so far |
| Final push | Small, frequent | To thirst | Top up if legs cramp | A gel or two if the finish is further off than expected |
Total for a 5-hour century at these targets: roughly 320-400g of carbohydrate, 2.5-3.75 litres of fluid, and 1,500-2,500mg of sodium — before accounting for a higher personal sweat rate.
What that adds up to on a shopping list
One reasonable way to hit the totals above without carrying an unreasonable number of pockets.
3 bottles of carb-electrolyte drink mix
Covers a baseline of carbohydrate and sodium without any chewing required — roughly 150-200g carbs and 750-1,500mg sodium depending on strength.
4-5 gels, mixed carb load
A couple of standard gels early, one or two higher-carb gels later when appetite for real food drops. Roughly 100-160g of carbohydrate.
1-2 pieces of real food
A banana, a rice cake or a slice of malt loaf around the two-to-three-hour mark — cheaper carbohydrate and a welcome break from sweetness.
Extra sodium for hot days
Salted rice cakes or an electrolyte capsule alongside drink mix if you know you are a heavier sweater than average.
Build the exact version for your ride
The table above is a sensible default. It is not your default — your weight, pace, the temperature on the day, and your own sweat rate all shift the real numbers meaningfully. Rather than scaling the table by hand, put in your ride time, temperature, body weight and preferred foods and get the carbohydrate, fluid and sodium targets built specifically around that ride, plus which products can supply it and roughly what it will cost.
Build my exact 100-mile nutrition plan — it takes the guesswork out of the maths above and turns it into an actual shopping list for the week before your ride.
100-mile ride nutrition questions
How many carbs do I need for a 100-mile bike ride?
For a moderate-pace century of roughly 5-6 hours, most riders need somewhere between 300-500g of carbohydrate across the ride, depending on pace, fitness and how aggressively they fuel. Faster riders pushing a higher carb rate over a shorter time can need more per hour even though the ride is quicker overall.
How much water should I drink on a 100-mile ride?
A commonly used starting point is 500-750ml per hour in mild conditions, adjusted up significantly in heat or for known heavy sweaters. Drinking to a fixed schedule rather than only when thirsty helps avoid under-drinking on long rides.
What should I eat the morning of a 100-mile ride?
A carbohydrate-rich, low-fibre, low-fat breakfast 2-3 hours before the start — porridge, toast with jam, a bagel or rice pudding are all sensible, familiar choices. Avoid trying new foods on the morning of the ride itself.
What happens if I don't eat enough on a long ride?
Under-fuelling on a long ride typically shows up as a sudden drop in power and mood, often called "bonking" or hitting the wall, usually once glycogen stores are significantly depleted. Eating on a schedule from hour one, rather than waiting until you feel hungry, is the main way to avoid it.
Related guides
Best energy gels for long bike rides
The gel and drink combinations behind the hour-by-hour numbers on this page.
Maurten vs SIS Beta Fuel
Choosing between the two most common high-carb gels for a ride this long.
Best electrolytes for heavy sweaters
Work out your own sodium target rather than using the average figures below.
Best energy gels for cycling
The full gel-by-gel comparison, if you want to swap products in the plan below.
Best electrolyte drinks for cycling
Product-level detail on the hydration mixes used in this plan.