How to Fuel a Long Bike Ride: The Complete Cycling Nutrition Guide

You've felt it. Somewhere past the three-hour mark the legs go from tired to hollow, the road tilts up, and the wheel in front of you just... rides away. That's not weakness. That's an empty tank. And the frustrating part is that the bonk at km 120 was decided hours earlier — probably before you clipped in.

Fueling a long ride isn't one decision. It's three, spread across three phases: what you do before, how you drip-feed during, and how you refill after. Get the arc right and the last hour feels like the first. Get it wrong and no amount of watts saves you.

This is the hub. Each phase below gets the rule of thumb you can actually use on Sunday, plus a link to the deep-dive when you want the detail.

The whole arc in one glance

Before we break it down, here's the shape of it. Think of your body as a fuel tank that holds only so much — most riders store roughly 1,500–2,000 kcal of carbohydrate as glycogen, enough for maybe 90 minutes to two hours of real work. Everything in this guide is about topping that tank before you leave, defending it while you ride, and refilling it fast when you're done.

The three-phase fueling arc for a long ride

Phase	Goal	Rule of thumb
Before	Top off glycogen, arrive not hungry, not stuffed	1–2 g carbs per kg bodyweight, 2–3 hours out
During	Spare your own stores by feeding from outside	60–90 g carbs per hour after the first hour; drink to thirst, ~500–750 ml/hr
After	Refill fast, kick-start repair	~1 g carbs per kg + ~0.3 g protein per kg within the first hour or two

• SGLT1 · glucose
• GLUT5 · fructose
• Glucose only
• Glucose + fructose
• g/hr absorbed
• Carbs per hour
• 0
• 120 g
• Both doors keep up
• Glucose maxed — fructose adds the rest
• Both maxed — the rest is wasted
• Fructose mix
• Glucose only
• 1:0.8 mix

Before: arrive with a full tank

Here's the myth worth killing first: a big pasta dinner the night before does not "load" you for a Sunday club run. Glycogen loading matters for stage races and all-day epics, not your usual four-hour bunch ride. For a normal long ride, the night before is just a sensible dinner. The meal that actually counts is the one 2–3 hours before you roll out.

That pre-ride meal has two jobs: top off the glycogen you burned overnight (your liver stores empty while you sleep), and settle before you start so you're not digesting a brick on the first climb. Aim for something carb-heavy and easy on the gut — porridge with banana and honey, toast with jam, a bowl of rice, a bagel. Roughly 1–2 grams of carbohydrate per kilo of bodyweight. For a 70 kg rider that's 70–140 g: think two slices of toast with honey plus a banana, or a decent bowl of oats.

Keep the fat and fibre modest — both slow digestion and both love to remind you of their presence on a hard effort. And if the ride starts early and eating at 5 a.m. makes you gag, a smaller carb hit (a banana and a bottle of sports drink) plus fuelling harder from the gun works fine.

Rule of thumb: 1–2 g carbs per kg bodyweight, 2–3 hours before you roll. Carbs high, fat and fibre low.

The full breakdown — timing, exact meals, what to do for a dawn start — is in what to eat before a long bike ride. Start there if breakfast is where your rides fall apart.

• Fat
• Carbohydrate
• FatMax
• LT1
• Intensity
• Easy
• Hard
• Mostly fat — the Zone-2 fuel
• The crossover — an even split
• Mostly carbs — burning sugar fast
• Fat-adaptation
• Sugar-burner
• Fat-adapted

• Glycogen stores
• Without fuelling
• The bonk
• With fuelling
• Hours riding
• Carbs per hour
• 0
• 120 g
• Empty before the finish — you bonk
• Fuelled to the finish
• Ride intensity
• Easy
• Hard

During: feed before you're empty

This is the phase that makes or breaks the ride, and it's the one riders neglect most. The single biggest mistake in amateur fuelling is waiting until you feel bad to eat. By the time you feel the bonk, you're already 20–30 minutes behind — a gel can't dig you out of a hole that deep. You fuel on a clock, not on feel.

The mechanism is simple. Your glycogen tank drains as you ride. Every gram of carbohydrate you take in from a bottle, gel, or bar is a gram your body doesn't have to pull from its own limited stores. Feed steadily and you protect the tank for the moment that matters — the last climb, the finishing move, the drag back into a headwind.

How much: the number that matters

For anything under about 90 minutes, water and your breakfast will carry you. Past that, you need carbs coming in. The Gatorade Sports Science Institute's review of the research puts the useful range at 30 to 90 grams of carbohydrate per hour for rides over 60 minutes, scaling up with duration and intensity.¹ In plain terms:

• 1–2 hour rides: 30–60 g/hr. One gel or one bar plus a bottle of mix per hour.
• 2–3 hours and beyond: 60–90 g/hr. This is where you need a plan, not vibes.

To go above 60 g/hr you need more than one type of sugar. Your gut can only pump so much glucose per hour through one intestinal transporter (SGLT1). Add fructose — which rides a separate pathway (GLUT5) — and you can push intake higher without the sloshing-stomach misery. That's why modern gels and drink mixes advertise a glucose-to-fructose blend. But a warning: your gut has to be trained for 90 g/hr. Try it cold on race day and you'll spend the ride looking for a hedge. Practise it on your long rides first.

The full mechanism — transporters, how to build up to 90+ g/hr, and how to space your feeds so you never spike or crash — is in how many carbs per hour: fuelling long rides without bonking. If you take one deep-dive from this guide, take that one.

Hydration: drink to thirst, replace the salt

Fuelling and hydration ride together. Aim for roughly 500–750 ml per hour, more in the heat, less on a cold winter spin — and let thirst be your guide rather than force-drinking to a rigid schedule. On rides over two hours, or any hot day, get sodium in too (an electrolyte tab or a proper sports drink). Plain water for five hours in July is how cramps and that foggy, flat feeling arrive. A neat trick: run your carbs in one bottle as drink mix and keep a plain water bottle for the rest, so your fuel and your fluid don't fight.

Rule of thumb: start eating by the 45–60 minute mark. 60–90 g carbs/hr on long rides. ~500–750 ml/hr with salt. Set a head-unit alarm every 20 minutes if you forget.

• What your gut clears
• Absorbed
• Backing up — gut rot
• Carbs per hour
• 0
• 120 g
• All absorbed
• At the limit
• Overflowing — gut rot
• Gut training
• Untrained
• Trained

• Bottle — every hour
• Gel — every ~40 min
• Real food — at halfway
• Hours
• Carbs per hour
• Gut's limit

Carbs per hour by how long you're riding

Ride length	Carbs per hour
Under 1 hr	0 g
1–2 hr	45 g
2–3 hr	70 g
Over 3 hr	90 g

After: the refill window

You've finished, you're wrecked, you want a shower and the sofa. But the 60–90 minutes after you stop are the cheapest performance you'll ever buy — especially if you're riding again tomorrow.

Two jobs here: refill glycogen and start muscle repair. For the refill, carbohydrate is king. For repair, add protein. Research on recovery points to roughly 1–1.2 g of carbohydrate per kg per hour in the first few hours to refill glycogen fastest, and co-ingesting around 0.3 g of protein per kg both supports muscle repair and helps glycogen storage when your carb intake is on the lower side.²

You don't need a shaker of powder to hit that. For a 70 kg rider, ~70 g carbs and ~20 g protein looks like: a big bowl of rice with chicken, a couple of eggs on toast with a glass of juice, or the classic that's popular for a reason — a large glass of milk with a banana and some cereal. Chocolate milk genuinely works because it lands close to the carb-and-protein ratio you're after.

How urgent is the timing? If your next hard ride is more than a day away, don't stress the exact minute — hit your totals across the day and you'll be fine. But if you're doing back-to-back long days, or training twice, eat within the first hour. That's when your muscles soak carbs up fastest.

Rule of thumb: within an hour or two, roughly 1 g carbs per kg plus ~0.3 g protein per kg. A real meal beats a supplement.

• Drink
• Gel
• Solid
• fast · hydrates
• fast · portable
• slow · filling
• Gut comfort
• Intensity
• Easy
• Threshold
• Easy pace — anything goes, solids spare your gels
• Tempo — gels and drink, go easy on solids
• Threshold — drink or gel; solids sit heavy

Put it together

None of this is complicated once you see the arc. Arrive full. Feed on a clock before you're empty. Refill fast. The riders who never seem to blow up aren't fitter by magic — most of the time they just fuel with a plan while everyone else guesses.

A few mistakes to stop making:

• Under-fuelling the "easy" days. A steady Zone 2 endurance ride still empties the tank over three or four hours. Long and easy is not the same as free.
• Trying new products on the big day. Your gut needs to rehearse. Test every gel, bar, and mix on training rides first.
• Treating water as fuel. Water hydrates. It doesn't refill glycogen. You need both, and on long days you need salt too.
• Skipping the refill because you're "not hungry." Hard efforts blunt appetite. Eat anyway — a drink often goes down when food won't.

If you're the one organising the ride, fuelling is a group problem too: a café stop at the right place, a nudge to newer riders to eat early, a spare gel in your pocket for whoever cracks. There's more on running the day well in the club group-ride playbook.

Nail the arc on a few long rides and it stops being something you think about. It just becomes the reason the last hour feels like the first.

---

¹ Gatorade Sports Science Institute, "Dietary Carbohydrate and the Endurance Athlete: Contemporary Perspectives" — carbohydrate ingestion of 30–90 g·h⁻¹ during exercise longer than 60 minutes, with glucose-fructose mixtures preferable at the higher end.
² Alghannam, Gonzalez & Betts, "Restoration of Muscle Glycogen and Functional Capacity: Role of Post-Exercise Carbohydrate and Protein Co-Ingestion," Nutrients (2018), PMC5852829.

FAQ

How many carbs per hour do I actually need for a normal Sunday ride, not a race?

Depends on duration. Under 90 minutes, your breakfast and water carry you fine — no gels needed. From 1-2 hours, aim for 30-60 g/hr, roughly one gel or bar plus a bottle of mix. Past 2-3 hours, push to 60-90 g/hr and treat it as a plan, not a vibe — that's where riders who never bonk are actually different from you.

Do I really need glucose-and-fructose gels, or is any gel fine?

Below 60 g/hr, plain glucose is fine — your gut's single transporter (SGLT1) handles it. Push past that and glucose alone saturates; the surplus just sits there. A glucose-fructose blend opens a second absorption pathway (GLUT5), letting you climb toward 90 g/hr without the sloshing gut. Only matters once you're feeding harder than 60 g/hr — and even then, train your gut on it first.

Is chocolate milk actually a decent recovery drink, or is that just a cliché?

It genuinely works. The refill window wants roughly 1-1.2 g of carbs per kg per hour plus about 0.3 g of protein per kg to refill glycogen and kick-start repair. A big glass of milk with a banana and cereal lands close to that carb-to-protein ratio without any shaker of powder — which is exactly why it's become the go-to, not just a cute recovery-room prop.

How much should I actually be drinking on a long ride?

Roughly 500-750 ml per hour, more in the heat, less on a cold spin — let thirst guide you rather than forcing a rigid schedule. Past two hours, or on any hot day, get sodium in too, since plain water alone for hours is how cramps and that flat, foggy feeling show up. Running your carbs in one bottle and water in another keeps fuel and fluid from fighting each other.