Cycling Nutrition for Gran Fondo: How to Fuel Big Days in the Saddle
A gran fondo is a different animal to your usual Sunday club run. Most events land somewhere between 120km and 200km, with 1,500m to 3,000m of climbing stacked into the middle third, and you will be out there for anywhere from five to nine hours. That duration is the whole problem. Your body stores roughly 400-500g of glycogen across muscle and liver, which is about 1,600-2,000 kcal of readily available fuel. At a steady tempo you are burning 600-900 kcal an hour. Do the arithmetic and you will find the tank runs dry somewhere around the two-and-a-half hour mark, which on a big fondo is usually just as the road starts pointing upwards.
Nobody trains for six months and then loses twenty minutes on the final climb because their legs gave out. They lose it because they stopped eating properly at hour three. Getting your cycling nutrition for gran fondo right is not complicated, but it does need to be deliberate — planned in grams and minutes rather than vaguely intending to grab something at the feed station. Here is how to build a plan that actually holds up over a long day.
Start With the Hourly Carbohydrate Number
Everything else follows from this one figure. For rides over three hours, the research consistently supports 60-90g of carbohydrate per hour. The lower end is achievable on glucose alone, because your gut can only absorb glucose at roughly 60g per hour through the SGLT1 transporter. To go beyond that you need fructose in the mix, which uses a completely separate transporter called GLUT5. Combine the two and total absorption climbs to 90g per hour or more.
For a gran fondo, here is a sensible way to pitch it:
- Sub-4 hours, steady effort: 60g per hour is plenty
- 4-7 hours with serious climbing: 75-90g per hour
- 7 hours plus: 90g per hour, and expect to want savoury food by hour five
Note that this is per hour from the start, not from when you begin to feel hungry. Hunger on the bike is a lagging indicator — by the time you notice it, you are already thirty to forty grams behind. Set a timer on your head unit for every twenty minutes and eat a third of your hourly target each time. It feels obsessive for the first hour and then it feels like the smartest thing you have ever done.
Build a Gran Fondo Fuelling Plan You Can Actually Follow
A plan that lives on a spreadsheet is worthless. A plan that lives in your jersey pockets in a specific order is the one that works. Here is the structure I use for a 160km fondo with roughly 2,000m of climbing, riding at around 700 kcal an hour and expecting to finish in six hours.
The night before: 6-8g of carbohydrate per kg of bodyweight across the day. For a 72kg rider that is around 450-570g. Rice, pasta, potatoes, bread — nothing exotic, nothing high in fibre, nothing you have not eaten before a long ride.
Three hours before the start: 1.5-2g per kg. Porridge with honey and a banana is the classic for a reason. Roughly 110-145g of carbohydrate for that same 72kg rider.
Hours 1-2: 60g per hour, mostly solid or chewable. Your gut is fresh and your stomach will handle texture happily at this stage. This is the cheapest fuelling you will do all day, so bank it.
Hours 3-5: 80-90g per hour. This is where the event is decided. Shift the balance towards easier-to-digest fuel — chews, drink mix, anything that does not require chewing through a climb.
Final hour: 60g per hour plus caffeine if you use it. Around 3mg per kg taken 45-60 minutes before the finish gives a genuine performance lift and reduces perceived effort on the last climbs.
Practise this exact sequence on at least three long training rides. Gut tolerance is trainable — the intestinal transporters upregulate with repeated exposure over four to six weeks — but nobody trains it on race morning.
Hydration, Sodium and the Feed Station Trap
Most riders lose between 500ml and 1,200ml of sweat per hour depending on temperature and effort. Sodium losses vary enormously between individuals, anywhere from 400mg to over 1,500mg per litre. The practical target for a long fondo is 500-750ml of fluid per hour with 500-800mg of sodium per litre. In genuine heat, push the upper end. In cold weather, do not stop drinking just because you are not thirsty — cold blunts the thirst response and dehydration will still cost you power.
Now, the feed stations. They are a trap for three reasons. First, you cannot control what is on the table, and event organisers change suppliers every year. Second, the queue at a busy fondo can be six or seven minutes, which wrecks your rhythm and lets your legs go cold. Third, and most importantly, whatever is on offer is food your gut has never met before. Half the GI misery at these events comes from riders trying an unfamiliar bar at kilometre 90.
Carry your own carbohydrate. Use the feed stations for water, and take a small amount of real food if you fancy it, but never rely on them for your hourly numbers. Two bottles plus enough fuel for four hours in your pockets, then one planned stop to refill, is a far more reliable structure.
What We Use at FTP Endurance Fuel
We built our pastilles around the problems above. They come in a 1kg bulk pack rather than single-serve sachets, which means you decant exactly what you need into a small bag for your jersey pocket and leave the rest at home. For a six-hour fondo that is roughly 450-500g of carbohydrate carried without a pile of wrappers to manage in the wind at 35kph.
The Mixed Fruit Pastilles are what most of our riders use during an event — the flavour rotation matters more than people expect, because palate fatigue at hour five is real and a single sweet flavour repeated forty times becomes genuinely difficult to swallow. The Tart Cherry Pastilles earn their place at the sharper end of the day and afterwards: Montmorency tart cherry is rich in anthocyanins, the pigment compounds shown to reduce markers of oxidative stress and muscle damage after prolonged effort. If you have a second big ride the following weekend, that matters.
The bulk format also fixes the cost problem. Fuelling properly at 80g an hour for six hours, every weekend through the summer, gets expensive fast with single-serve products — which is exactly why so many riders quietly under-fuel. Working out cost per gram of carbohydrate rather than cost per packet tends to change the maths considerably.
Sort your cycling nutrition for gran fondo the same way you sort your gearing: decide before the start, test it in training, and do not improvise on the day. Pick your hourly number, put the fuel in your pockets in the order you will eat it, set the timer, and let the plan carry you through the hours when your legs start voting against you. If you want to trial a flavour before committing to a 1kg pack, the Taster Pack is the sensible place to start — take it out on your next four-hour ride and see how your gut gets on with it.
