Cycling gels and bars: fueling strategy for long rides

When you're 80 km into a 150 km ride and your legs feel heavy, your mind foggy, it's not weakness, it's an empty tank. This is where cycling gels and bars become non-negotiable. Unlike casual rides, anything over 90 minutes demands external fuel. Your glycogen stores don't last forever, and waiting until you're desperate to eat is too late.

Why cycling gels and bars matter on long rides

Your body stores roughly 90 minutes of hard riding worth of carbohydrate (glycogen) in your muscles and liver. After that, you're drawing down reserves. Bonking, the sudden loss of power and mental clarity, happens when glycogen depletes. It's not a character flaw; it's physiology.

Cycling gels and bars solve this by delivering quick carbs when your gut can absorb them. A good energy gel gives you 20–30 grams of carbs in an easily digestible form. A bar, typically 40–60 grams of carbs, takes longer to break down but gives steadier energy. Together, they're the difference between finishing strong and crawling home.

Research consistently shows that carbohydrate intake during endurance cycling improves both performance and recovery. A study published in the Journal of Sports Sciences found that riders consuming 60–90 grams of carbs per hour maintained power output and reduced perceived effort compared to those who didn't fuel (Jeukendrup, 2004).

Types of cycling gels: which to choose

Energy gels come in three main camps: simple sugar gels, complex carb gels, and caffeinated variants.

• Simple sugar gels (glucose, maltose): Fast-acting, 20–25g carbs per serving. Best for immediate energy boost or in the final hours when digestion isn't the priority. Brands like GU, Clif Shot, and SiS fall here.
• Complex carb gels (maltodextrin blends): Slower digest, less spikey, easier on the stomach. Often 25–30g carbs. Better for mid-ride fuel when you want steady energy without the crash.
• Caffeinated gels: 25–50 mg of caffeine per gel, helpful in final hours for mental sharpness and a small power boost. Use cautiously if caffeine unsettles your gut.

Real-world choice? Test during training rides, not race day. Your stomach is highly individual. Some riders thrive on single-ingredient gels; others need the complex carbs and electrolytes of premium brands. Start with one gel brand and stick with it until you know it works.

Energy bars for cycling: when to use them

Energy bars (also called nutrition bars or cycling bars) are solid food, they take 30–45 minutes to fully digest, but they feel more like eating, which many riders prefer. A typical bar delivers 40–60g carbs plus 5–15g protein.

Use bars when you have time to digest, early-to-mid ride, not in the last hour. They're also better for riders with sensitive stomachs or those who get bored with gels. Bars with oats, nuts, or whole grains digest slower, giving steadier energy. Simpler bars with fewer ingredients digest faster.

Don't rely on bars alone for rides over 3 hours. You can only absorb a limited amount of food when riding hard. A bar might be 5 minutes of chewing and 30 minutes of digestion, gels, by contrast, are absorbed in 15–20 minutes with minimal gut work.

Fueling strategy: the timing that works

Fuel before you're empty. The rule of thumb: 60–90 grams of carbs per hour of hard riding. That's one gel (25g) plus half a bar (30g), or two gels, every 45 minutes, not a fixed schedule, but tied to intensity and remaining ride time.

• First hour: Eat conservatively. Your glycogen is full; pace your intake.
• Hours 2–3: Ramp up. Consume gels or bars every 30–45 minutes, aiming for 60–80g carbs per hour.
• Final hour: Intensity matters. If you're racing or pushing hard, maintain the same rate. If cruising, you can drop intake.
• Always carry water or sports drink: Gels need liquid to absorb. Dehydration kills digestion faster than anything.

Adapt on the day. If the route has harder sections, fuel a bit earlier. If it's hot and your stomach feels tight, switch to liquid calories (sports drink) and save gels for when you feel settled.

Avoiding stomach issues and maximizing absorption

A gel sitting badly in your stomach is worse than no gel. The cardinal rules:

• Drink with every gel: 150–200 ml of water or sports drink per gel. A dry gel is a cramped stomach.
• Don't test new products on long rides: Train your gut. Use the same gels and bars in training so your digestive system adapts.
• Space intake evenly: Dumping 100g carbs in one sitting overloads your gut. Smaller, frequent doses absorb better.
• Eat before you bonk: Once you're truly empty, food won't help fast enough. You've lost the window.
• Match intensity to digestion: Hard efforts demand simple gels; easy spins allow bars and real food.

Caffeine can also upset stomachs in heat or at high intensity. If you're new to caffeinated gels, trial them on short, steady-paced rides first.

How MoguWind helps you fuel smarter

MoguWind calculates the exact wind and effort you'll face at each kilometre of your route. This matters for fueling: a route with a brutal headwind in the final 30 km will cost you 200+ extra calories compared to flat terrain. By seeing the wind profile ahead of time, you can plan your intake strategically, take extra gels before the hard section, not after it when digestion is already working overtime.

Similarly, if you're planning a long route and want to know how hard it'll be (and thus how much fuel you need), MoguWind Plan shows you the wind impact kilometre by kilometre. A 100 km loop with 3000 m of climbing and consistent headwinds demands much more fuel than 100 km of rolling terrain with a tailwind. Plan your nutrition around the actual effort, not just distance.

And if you're serious about getting the timing right, Bidón, a free Garmin Edge app from the same team, alerts you in real time when to eat and drink. It adapts to your cadence, heart rate, and effort, sending notifications so you never miss a fueling window. That's the difference between fueling by the clock and fueling by your actual physiology.

Practical fueling checklist for your next long ride

• Choose one gel and one bar type. Stick with them through training.
• Carry 25% more fuel than you think you'll need (things go wrong, routes get longer).
• Start fueling at 75 minutes, not 90.
• Aim for 60–90g carbs per hour depending on intensity.
• Drink 150–200 ml with every gel or bar.
• Test fueling strategy on rides under 2 hours before applying it to 4+ hour efforts.
• Use MoguWind to preview the wind and adjust your fueling plan based on the hardest sections of your route.

Cycling gels and bars aren't optional luxury items, they're tools that let you finish strong instead of empty. Master the timing, know your gut, and you'll ride better on every long day out.