NutritionAnswer

HOW MANY CARBS PER HOUR SHOULD I EAT WHILE CYCLING?

By Anthony WalshRoadman CyclingUpdated 10 July 2026

ANSWER

For rides over 90 minutes, aim for 60-90g of carbohydrates per hour using a 2:1 or 1:0.8 glucose-to-fructose mix to maximise absorption across dual intestinal transport pathways. World Tour teams now push up to 120g/hr in Grand Tour stages, but this requires systematic gut training over 4-8 weeks. Start at 40-50g/hr and increase by 10g per week to allow your gut to adapt. Below 90 minutes, water and a small amount of carbohydrate (20-30g) are sufficient for most riders. The single biggest fuelling mistake in amateur cycling is eating too little, not too much.

KEY TAKEAWAYS

60-90g of carbs per hour is the evidence-based target for rides over 90 minutes.
A 2:1 glucose-to-fructose ratio maximises carbohydrate absorption by using two separate intestinal transporters (SGLT1 and GLUT5).
Gut training over 4-8 weeks allows you to tolerate higher intake rates — start at 40-50g/hr and build up.
Professional riders now consume 90-120g/hr in races, a significant increase from the 40-60g/hr recommended a decade ago.

WHO THIS IS FOR

IS THIS YOU?

Riders who bonk on long rides despite eating

You carry food but still hit the wall after 3-4 hours because the amount you consume falls well below your expenditure rate.

Sportive riders planning fuelling strategy for an event

You want a specific plan for what and how much to eat during a 100+ mile ride rather than guessing on the day.

THE ROADMAN VIEW

The sports nutrition world has shifted dramatically in the past five years. The old advice of 30-60g/hr has been replaced by 60-90g/hr as the baseline, with elite riders going even higher. The research from Asker Jeukendrup and others is clear: most amateurs massively under-fuel on long rides, and the performance penalty is enormous.

The practical challenge is gut tolerance. You cannot go from eating one gel per hour to three overnight. Gut training is a real physiological adaptation — your intestinal transporters upregulate with consistent practice. Start on training rides, build gradually, and by the time your event arrives your gut should handle the target intake without complaint.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Prof Asker JeukendrupSports nutrition researcher, founder of Mysportscience
The dual-transport model shows that glucose absorption via SGLT1 saturates at approximately 60g/hr. Adding fructose, which is absorbed via the separate GLUT5 transporter, allows total carbohydrate oxidation to reach 90-100g/hr or higher. The 2:1 glucose-to-fructose ratio has been the standard recommendation, but more recent data suggests ratios closer to 1:0.8 may be equally effective and better tolerated by some athletes.

PRACTICAL APPLICATION

DO THIS WEEK

Calculate your target intake and build a fuelling plan
For a four-hour sportive, aim for 60-80g of carbs per hour from a mix of gels, bars, and drink mix. That means roughly one gel (25g) plus 500ml of carbohydrate drink (40-50g) per hour, or two gels and plain water. Lay out exactly what you will consume in each hour before the ride starts, and set timer reminders on your head unit.
Train your gut systematically over 4-8 weeks
Start at 40g of carbs per hour on your long training rides. Each week, increase by 10g. Practice with the exact products you will use in your event. If you experience GI distress at a given level, hold there for two weeks before trying to increase again. Most riders can reach 80-90g/hr within 6-8 weeks of consistent practice.
Choose products with the right glucose-to-fructose ratio
Look for gels, drink mixes, and bars that use maltodextrin (a glucose polymer) combined with fructose. Many modern sports nutrition brands (SiS Beta Fuel, Maurten, Precision Fuel) now formulate specifically for high carbohydrate intake with dual-transport ratios. Avoid products that use only glucose or sucrose if you are targeting 60g/hr or above.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEWaiting until you feel hungry or depleted before eating.
FIXStart fuelling from the first 20-30 minutes of a ride. By the time you feel hungry, glycogen stores are already significantly depleted. Eating early and consistently prevents the deficit from building.
MISTAKEUsing only glucose-based products and hitting the absorption ceiling.
FIXSingle-carbohydrate products max out at ~60g/hr absorption. Switch to dual-source products (glucose + fructose) to access the second transporter and push absorption above 60g/hr without GI distress.
MISTAKENot practising race-day nutrition in training.
FIXYour gut adapts to what it is trained to do. If you never eat 80g/hr in training, attempting it on race day will likely cause stomach problems. Rehearse your exact fuelling plan on multiple training rides before the event.

FAQ

FREQUENTLY ASKED QUESTIONS

Can I get 90g of carbs per hour from real food?

It is difficult but possible with foods like rice cakes, bananas, and dates, though the convenience and absorption speed of gels and drink mix makes them the preferred option at higher intake rates. Real food works well for the first 60g; many riders top up the remaining 20-30g with gels or drink mix.

Do I need to eat carbs on rides under 90 minutes?

For most riders, no. Glycogen stores are sufficient for 60-90 minutes of moderate to hard riding. A mouth rinse with a carbohydrate drink may provide a small performance boost for hard efforts under an hour, but solid food intake is unnecessary for shorter rides.

Is it possible to eat too many carbs per hour?

Yes — exceeding your gut's absorption capacity causes GI distress: bloating, cramping, and sometimes vomiting. The ceiling is individual and trainable. Most recreational cyclists should cap at 80-90g/hr unless they have specifically trained for higher intake over several months.