Century Ride Fueling Plan: What to Eat and Drink for 100 Miles

Race Day / Cycling Nutrition / Fueling Plans

A century ride is long enough that fueling mistakes compound. A missed bottle in hour one can show up as poor decisions in hour four. The goal is to start with a plan that covers carbs, fluids, sodium, aid stations, and backup fuel before the ride begins.

Estimate the ride time first

A 100-mile ride can take four hours for a very strong group or eight-plus hours for a recreational event. Fueling should be based on expected time, not just distance. Terrain, wind, stops, heat, and group dynamics all change the demand.

5-hour century at 60 g/hour = 300 g carbohydrate.
6-hour century at 60 g/hour = 360 g carbohydrate.
7-hour century at 50 g/hour = 350 g carbohydrate.
6-hour century at 75 g/hour = 450 g carbohydrate.

Pick a carb target you have practiced

For many century rides, 60 g/hour is a practical starting target. Some athletes may use less on easier events with frequent stops, while trained riders in hard events may target 75-90 g/hour. Higher targets should be practiced because gut tolerance matters as much as the number.

Jeukendrup's review explains that a single carbohydrate source is commonly limited around 60 g/hour, while higher intake usually depends on multiple transportable carbohydrates. That matters for century events because gels, drink mixes, and chews often use different carbohydrate blends.

Build a carry-and-refill plan

Do not assume aid stations will solve everything. Decide what you will carry from the start, what you expect to refill, and what happens if an aid station has different products than expected.

Bottles: know how many grams of carbohydrate and sodium are in each bottle.
Gels or chews: count servings by hour, not just by pocket space.
Bars or real food: use them when chewing is realistic, often earlier or during easier sections.
Backup: carry at least one familiar emergency option for delays or missed stops.

Plan fluid and sodium around conditions

Hydration needs vary widely across athletes and conditions. NATA recommends using individual sweat-rate context and avoiding both excessive body mass loss and overdrinking that causes weight gain during exercise. In hot weather, fluid needs may rise, but drinking beyond losses can create its own risk.

For a century, think in segments. What will you drink in the first hour? Where is the first refill? How will sodium intake change if the day is hotter than expected?

Use timing reminders

Century rides are full of distractions: group rotations, climbs, descents, traffic, aid stations, mechanicals, and conversations. A 15- to 30-minute fueling rhythm makes the plan easier to execute than waiting for hunger. BonkGuard can turn your selected fuels into a timeline and send local notifications when the plan is started.

Example plan

For a 6-hour century at 60 g/hour, the target is 360 g carbohydrate. One possible plan is two 60 g bottles at the start, four 30 g gels, two 40 g bars, and two refill bottles with 50 g carbohydrate each. That adds up to 420 g available, giving a margin in case the ride runs long or a serving is missed.

The exact products matter less than the audit: does the plan add up, can you carry it, can you refill it, and have you practiced it?

Key takeaway

A century fueling plan should be built from expected ride time, target carbs per hour, fuel availability, fluid and sodium needs, aid-station strategy, and reminders. BonkGuard helps turn that into a ride timeline instead of a pocket full of guesses.

Sources and context

Educational note

This article is educational and is not medical or nutrition-treatment advice. Athletes vary widely in tolerance, sweat rate, health history, and goals. Practice fueling and hydration changes in training, not for the first time on race day, and work with a qualified professional when you need individualized medical or nutrition guidance.