For a cyclist heading out for two hours, 30–60g of carbohydrate per hour is a useful starting point. For a ride lasting more than two-and-a-half to three hours, particularly a hard sportive or race, intake can rise towards 90g per hour. Neither number is a requirement for every ride. A gentle 45-minute spin is a different nutritional problem from a four-hour ride that ends with a sustained climb.
That distinction is becoming more important as professional racing pushes towards ever-higher fuelling rates. Reports of WorldTour riders taking 120g of carbohydrate or more each hour are genuine, but they do not mean an amateur rider needs to copy them. The best number is the one justified by the ride and comfortably achievable in practice.
Photo Credit: Vitalii Pavlyshynets / UnsplashHow many grams of carbohydrate should you eat per hour on the bike?
The Australian Institute of Sport’s guidance separates exercise by duration and demand. For brief exercise lasting under 45 minutes, carbohydrate during the session is generally unnecessary. For sustained hard efforts of roughly 45–75 minutes, even small amounts can be useful. Endurance sessions of one to two-and-a-half hours commonly justify 30–60g per hour, while longer events can call for up to 90g per hour.
| Ride duration and intensity | Practical carbohydrate target | How to interpret it |
|---|---|---|
| Under 45 minutes, especially easy riding | Usually none needed during the ride | Normal meals beforehand and afterwards may be sufficient |
| 45–75 minutes of sustained hard riding | Small amounts may help | Benefit depends on intensity and pre-ride fuelling |
| One to two-and-a-half hours | About 30–60g per hour | Start nearer the lower end for easier sessions; move higher for demanding efforts |
| More than two-and-a-half to three hours | Up to about 90g per hour | Most relevant to hard, long rides where carbohydrate availability matters |
| Elite racing at very high intensity | Sometimes 90–120g per hour or more | A specialist approach, not a default recreational target |
These are broad sports-nutrition guidelines, not precise thresholds at which the body suddenly runs out of fuel. Someone who ate a substantial carbohydrate-rich meal before a steady 90-minute ride may need less than somebody starting a hard session after a long day at work. The same cyclist can have different requirements on different days.
Think in terms of the work being done, the time spent riding and how the session fits into the rest of the week. A relaxed café ride with several stops is not nutritionally identical to a non-stop club chain-gang, even when the elapsed time is the same.
Why carbohydrate matters more as the ride gets longer
The body draws on a combination of carbohydrate and fat during cycling. The proportion changes with intensity and individual physiology, but carbohydrate becomes particularly important when the effort rises. Muscle and liver glycogen provide a valuable supply; they are not an unlimited tank. Taking carbohydrate during a ride gives the working muscles access to an additional source of fuel and can help preserve the ability to sustain demanding efforts late in the session.
That does not mean every tired cyclist is experiencing a simple carbohydrate shortage. Poor pacing, inadequate sleep, heat, dehydration and insufficient training can all make riding harder. Eating more will not solve all of those problems. Equally, an athlete who consistently fails to take in enough energy may struggle with recovery and training quality even when individual rides feel manageable.
This is why the advice to fuel the work required is more useful than a universal rule about gels. The higher-intensity parts of a long ride are precisely when readily available carbohydrate becomes valuable, yet technical descents, crowded bunches and hard climbs can make eating awkward. A good fuelling plan anticipates those moments.
What does 30g, 60g or 90g per hour look like in real food?
Carbohydrate figures are quantities of carbohydrate, not the weight of the food or drink. A 60g energy bar does not necessarily provide 60g of carbohydrate. The same applies to a sachet of drink mix. Check the nutritional label for the amount in the portion you are actually using, including the number of scoops added to a bottle.
At 30g per hour, one carbohydrate-containing snack may cover much of the target. At 60g, it might be a drink providing 30g plus a gel providing 25g and a few bites of another snack. At 90g, a rider may prefer a mixture of drink and gels because swallowing several bars becomes impractical while riding hard. These are arithmetic examples, not claims about any particular product: the numbers must come from the packaging.
Ordinary food works too. Bananas, jam sandwiches, malt loaf and rice cakes can be useful, especially on gentler rides. They are often cheaper and easier to enjoy than an uninterrupted succession of gels. However, portion size, fibre, fat and how much chewing is involved all matter once intensity increases. Solid food that sits happily during an endurance ride may be difficult to tolerate in a fast group.
British Cycling’s published indoor-fuelling guidance illustrates the point with familiar foods and gives examples of how several small servings can add up towards a 30–60g hourly intake. It is the total that matters, not whether every gram comes from a specialist sports product.
How to calculate carbohydrate for a three-hour or four-hour ride
Start with a target per hour, then multiply it by the number of hours you expect to be moving. A three-hour ride at 60g per hour calls for approximately 180g of carbohydrate consumed during the ride. Four hours at that same rate calls for about 240g. If you choose 75g per hour for a four-hour demanding sportive, the total becomes 300g.
That is the amount you need access to, not a suggestion to consume it in one sitting. Most riders will find it easier to spread intake through the hour. For example, 60g can be divided into three 20g portions at roughly 20-minute intervals. Others prefer sipping carbohydrate drink regularly and eating a snack each half-hour. Either approach can work if the total is sensible and gastrointestinal comfort is good.
A useful practical detail is to leave some flexibility. The same 100km sportive may take one rider three-and-a-half hours and another more than six, depending on terrain, stops and speed. Packing only enough food for the fastest possible completion time is a poor plan, particularly in winter when mechanical delays are more uncomfortable. Start with moving time, add a margin, and know where additional food is available if the route takes longer than expected.
Should amateur cyclists copy the professionals eating 120g per hour?
Professional intake has changed substantially. A 2026 review from the UCI Sports Nutrition Project, published in the International Journal of Sport Nutrition and Exercise Metabolism, describes a shift from commonly reported on-bike intakes of roughly 30–60g per hour before 2010 towards 90g and, in selected modern racing conditions, 120g or more. Faster, harder racing and more systematic practice with fuelling help explain the change.
The distinction between what riders do and what research has proved is important. That UCI review notes the limited direct evidence of extra performance benefit above 90g per hour. A 2026 study of 16 endurance-trained cyclists and triathletes found that taking 120g per hour, compared with 60g or water, better preserved critical power after a demanding three-hour protocol. That is an interesting finding about performance under fatigue, but it is not proof that every amateur will ride faster by doubling their intake.
There is also a mechanical limit to what the gut finds comfortable. At higher rates, using different carbohydrate types, commonly glucose or maltodextrin alongside fructose, can support absorption through different pathways. Riders targeting high intakes usually practise them progressively. Turning up with a 120g-per-hour plan for the first time on sportive day is much more likely to create problems than reveal hidden fitness.
For a typical two-hour club ride, 30–60g per hour remains a far more sensible reference point. A rider racing hard for four or five hours may have good reason to work towards 90g. A much higher target deserves the same care as any other specialist training intervention: an actual performance need, a plan and enough practice to tolerate it.
When to start eating and how to avoid stomach problems
Do not wait for the dramatic feeling of running out of energy. On a long ride, begin taking small amounts early enough that eating becomes a routine. The goal is steady intake rather than trying to correct two hours of under-fuelling with several gels in the final half-hour.
Practice at a manageable level first. If 40–50g per hour feels straightforward on endurance rides, try a modest increase during a similar session and note how it affects comfort. Large jumps, highly concentrated drinks, unfamiliar products and hard efforts immediately after a substantial meal can all make it more difficult to tolerate carbohydrate. The best routine is established on ordinary training days, not while trying to hold a wheel in a race.
It also helps to separate eating from drinking. A bottle may contain carbohydrate, electrolytes, both or neither. More carbohydrate powder does not necessarily provide more appropriate hydration, particularly in warm conditions. Fluid needs vary with the weather, sweat rate, clothing and intensity; a rigid one-bottle-per-hour rule cannot cover every rider. The ProCyclingUK guide to electrolyte tablets looks at those products separately.
Anyone managing diabetes, a gastrointestinal condition or another health issue that affects fuelling should adapt these general sports-nutrition guidelines with appropriate professional advice rather than treating a table as a personal prescription.
A fuelling plan that fits an ordinary weekend ride
Consider a three-and-a-half-hour weekend ride with a sustained climb near the finish. A rider who has practised 60g per hour could aim for around 210g across the riding time, split between bottles and food. That might mean planning one bottle with a known carbohydrate quantity for each segment of the ride, a few familiar snacks and an extra gel that can be taken before the climb. The exact combination is less important than counting the total correctly and ensuring there is enough plain fluid available for the conditions.
By contrast, the same cyclist doing a 50-minute easy indoor recovery spin may have no need for on-bike carbohydrate. The session itself might be surrounded by normal meals, and there is no performance advantage in treating it like a mountain stage. For riders still developing a fuelling routine, ProCyclingUK’s beginner guide to eating on the bike covers everyday meal and snack choices.
Count the carbohydrate before setting off, then make the plan easy to follow while riding. If the route finishes with its hardest climb, carrying the right food will be of little use if you have left most of it untouched until the final hour.
