How Many Carbs per Hour When Cycling? 30/60/90/120g Explained
The number that decides almost every other fuelling decision. Here's what 30, 60, 90 and 120g of carbohydrate an hour actually mean, and how to work out where you sit.
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The single number behind most fuelling decisions
Almost every gel, drink mix and "how much should I eat" question eventually comes back to one figure: grams of carbohydrate per hour. It decides how many gels you need, whether you need a high-carb product or a standard one, and roughly what a ride is going to cost you in nutrition. Getting this number roughly right matters more than which specific brand you choose.
What 30, 60, 90 and 120g actually mean
| Target | Typical use case | What limits it | Roughly equivalent to |
|---|---|---|---|
| 30g/hour | Short or easy rides under 90 minutes, or as a floor even on easy long rides | Barely tests gut tolerance — almost anyone can manage this | One standard gel per hour, or a few mouthfuls of a carb drink |
| 60g/hour | The commonly cited baseline for rides over 90 minutes to 2-3 hours at moderate-to-hard effort | Roughly the ceiling for glucose-only carbohydrate absorption in an untrained gut | Two standard 20-25g gels an hour, or one gel plus part of a carb drink bottle |
| 90g/hour | Long or hard rides — sportives, races, 3+ hour efforts where performance matters | Requires a glucose:fructose blend (multiple transportable carbohydrates) to absorb this much without distress | One high-carb 40g gel (Beta Fuel) plus a carb drink, or 3-4 standard gels |
| 120g/hour | The current upper edge of competitive endurance and ultra-distance fuelling | Needs a well gut-trained rider and a carefully built glucose:fructose mix, usually a combination of drink, gel and sometimes real food | Roughly one high-carb gel every 20 minutes, or a strong carb drink plus gels throughout |
These are targets, not requirements — plenty of recreational riders do perfectly well at 30-60g/hour on rides under two hours, and pushing higher only matters once duration or intensity genuinely demands it.
How to work out where you should sit
- Ride under 90 minutes, moderate effort: 30-45g/hour, or even none at all if you ate well beforehand.
- Ride 90 minutes to 3 hours, moderate-to-hard effort: 60g/hour is a sensible working target for most riders.
- Ride 3+ hours, or racing/sportive intensity: 80-90g/hour is where most current sports nutrition guidance sits, provided your gut can handle it.
- Ultra-distance or elite-level racing: 100-120g/hour is achievable with training and the right carbohydrate blend, though it is not necessary for most riders outside competitive long-distance events.
Duration matters as much as intensity here. A hard 90-minute crit and an easy 6-hour gravel ride can call for very different hourly targets even though both are demanding in their own way.
Why you can't just jump to 90-120g/hour
The gut absorbs glucose through a limited number of transporters, capping glucose-only intake at somewhere around 60g/hour for most people before it risks sitting undigested and causing bloating or cramping. Getting past that ceiling requires two things:
- A glucose-plus-fructose blend, which uses a second absorption pathway and allows meaningfully higher total intake — this is why high-carb gels like SIS Beta Fuel and Maurten use these blends rather than simple glucose.
- Gut training — gradually increasing carbohydrate intake during training rides over several weeks, which measurably improves the gut's ability to absorb higher carb loads without distress.
Jumping straight to 90g/hour on race day without either of these is a common and avoidable cause of mid-ride gut problems.
Where this number turns into a shopping list
Once you know your target grams per hour, the next step is converting it into an actual combination of gels, drink mix and food for the length of ride you're doing. See best energy gels for long bike rides for combinations built around 60, 90 and 120g/hour, or what to eat and drink on a 100-mile ride for a full worked example.
Carbs-per-hour questions
How many carbs per hour do I need cycling?
It depends on ride duration and intensity. Roughly 30-45g/hour for short or easy rides, 60g/hour as a common baseline for rides over 90 minutes, and 80-120g/hour for long or hard efforts, provided your gut is trained to tolerate it.
Can I eat 90g of carbs an hour without gut training?
Some riders can, but many cannot without discomfort. Gradually building carbohydrate intake during training rides over several weeks is the standard way to improve tolerance before relying on a high carb rate in a race.
Why can't I just eat more glucose to hit 90g/hour?
Glucose-only carbohydrate absorption is limited to roughly 60g/hour for most people through a single gut transporter. Going higher generally requires a glucose-plus-fructose blend that uses a second absorption pathway.
Is 120g of carbs per hour necessary for most cyclists?
No. That level is mainly relevant to competitive endurance and ultra-distance racing. Most recreational and club riders do well on 60-90g/hour, and shorter or easier rides need far less.
Related guides
Best energy gels for cycling
Which gels suit which carbs-per-hour target, compared on cost and gut comfort.
Best energy gels for long bike rides
Turning an hourly carb target into an actual shopping list for a 4-6 hour ride.
What to eat and drink on a 100-mile ride
A full hour-by-hour plan built around exactly this kind of carb-per-hour target.
Maurten vs SIS Beta Fuel
The two gels most associated with the 90g/hour-plus end of this scale.