A first century is realistic for most healthy riders who can already ride about 50 km (30 miles) comfortably, and the way to get there is a slow build of one long ride per week, with easy rides around it, over roughly 16 weeks. Longer is fine; shorter works for riders who already ride long regularly. The plan below is an example progression, not a standard: adjust it to your fitness, terrain and calendar.
Decide whether you are ready to start
Begin the block when a 50 km (30 mile) ride feels comfortable and you recover from it within a day or two. If you are not there yet, ride three or four days a week at an easy pace until you are. A century is a long aerobic effort, so the base you build matters more than any single hard workout.
Check with a health professional before starting if you have a medical condition or have been inactive. One hospital health library lists conditions where this matters most, including a diagnosed heart condition and blood pressure medication. Stop riding and get medical advice for chest pain, dizziness or unusual shortness of breath during training. Chest pain that does not ease with rest is an emergency.
How long to plan for
Published plans differ. TrainerRoad treats about twelve weeks as the minimum for base training, while Blood Cancer UK’s beginner century plan runs 20 weeks. Sixteen weeks sits between them and fits most schedules. If you are newer to cycling, choose the longer end.
Example 16-week plan
Each week has one long ride, two or three shorter easy rides, and at least one rest day. In every third or fourth week the long ride drops for recovery. Increases stay modest, usually 5 miles (8 km) at a time, so the later 70 to 80 mile rides come after a steady build rather than a jump. Add one steady mid-week effort, a pace slightly harder than conversational, from week 6 if you are recovering well.
| Week | Long ride | Focus |
|---|---|---|
| 1 | 48 km (30 mi) | Baseline: ride this comfortably before starting the block |
| 2 | 56 km (35 mi) | Add a little distance; keep other rides easy |
| 3 | 64 km (40 mi) | Add a little distance; practice drinking and eating every 20-30 minutes |
| 4 | 48 km (30 mi) | Recovery week: shorter long ride, extra rest |
| 5 | 72 km (45 mi) | Resume building |
| 6 | 80 km (50 mi) | Add a steady mid-week effort |
| 7 | 88 km (55 mi) | Practice the exact food and drink you plan to use on event day |
| 8 | 64 km (40 mi) | Recovery week |
| 9 | 97 km (60 mi) | Longest ride so far; check bike fit, saddle and clothing over this duration |
| 10 | 105 km (65 mi) | Practice holding a steady, conversational-to-moderate pace for hours |
| 11 | 113 km (70 mi) | Dress rehearsal: ride at planned event pace with planned fueling |
| 12 | 80 km (50 mi) | Recovery week |
| 13 | 121 km (75 mi) | Near-peak ride; keep the effort easy |
| 14 | 129 km (80 mi) | Peak long ride; one is enough, no need to go further |
| 15 | 80 km (50 mi) | Taper: cut volume, keep a few short easy rides |
| 16 | Event week | Two or three short, easy spins early in the week; rest the day before; ride the century |
You do not need to ride the full 160 km (100 miles) in training. Many riders peak near 80 miles and let the event atmosphere, aid stations and a rested body carry them the rest of the way. If a week leaves you sore, sleeping badly or dreading the bike, repeat the previous week rather than moving on. Reading about building cycling endurance and cycling training zones helps you judge effort without a power meter.
Pacing on the day
Use effort, not the clock. TrainerRoad suggests an effort of 6 or 7 on a 1 to 10 scale for a century, which should feel steady and sustainable, never a race. Expect at least five hours in the saddle; hilly courses or heat can push that to six or seven hours. Starting too fast is the most common way to ruin the second half, so keep the first hour easier than feels necessary. If you ride in a group, see how to ride safely in a group, and for climbs see how to ride uphill without burning out.
Fueling and drinking
Carbohydrate becomes a very important fuel once exercise passes two hours. Sports-nutrition research describes about 60 g of carbohydrate per hour for efforts of 2 to 3 hours and about 90 g per hour for ultra-endurance events, but those figures are for well-trained athletes and the same source says aspiring athletes may need to adjust them downward. Absorption is the limit: the gut transporter for glucose becomes saturated at around 60 g per hour, and higher intakes need a mix of carbohydrate types that use different transporters. For a first century, start well below those ceilings and build up. Research shows the gut can adapt to carbohydrate during training, so practice during long rides.
Eat on a schedule. A timer set to every fifteen to thirty minutes prompts you to eat and drink before you feel empty. Test foods on training rides, because something that works off the bike may not sit well on it. Our cycling nutrition guide covers specific foods and amounts.
For fluids, drink to thirst rather than forcing a fixed volume. An international consensus statement on exercise-associated hyponatremia (dangerously low blood sodium) concluded that drinking when thirsty is the best approach to prevent it. Overdrinking plain water on a long, hot ride is a real risk. If you feel confused, nauseated, swollen or severely headachy during or after a ride, stop and seek medical help. In heat, read cycling in hot weather.
Bike and kit check
Do the long rides on the bike you will ride on the day. Saddle discomfort, numb hands and neck pain show up after three or four hours, so use the long rides to adjust position (see how to fit a bike properly). Replace worn tires and have a mechanic inspect brakes and drivetrain a week or two before the event. Carry a spare tube, a pump or CO2 inflator, and a multitool. If anything on the bike feels loose or brakes feel weak, do not ride it until it is serviced.
Sources
- TrainerRoad: Training for a Century: Be Prepared for Your First 100 Mile Ride
- Blood Cancer UK: 100-mile century cycle ride
- Jeukendrup (Sports Medicine, 2014): A Step Towards Personalized Sports Nutrition: Carbohydrate Intake During Exercise
- Wolters Kluwer Health via ScienceDaily: Drink when thirsty to avoid fatal drops in blood sodium levels during exercise
- University Hospitals: Exercise: Before Starting an Exercise Program
Last reviewed: October 2026.