CHARLY GAUL CYCLOSPORTIVE TRAINING GUIDE: LUXEMBOURG'S 4,000M CLIMBING CHALLENGE

Charly Gaul won the 1958 Tour de France in conditions that would make most modern riders abandon. Rain, cold, mountain passes ridden on steel bikes with downtube shifters. The Luxembourg climber earned the nickname "The Angel of the Mountains" for his ability to float uphill when others crumbled. The cyclosportive named in his honour takes riders through the same Ardennes countryside that shaped him -- and while the roads are better now, the hills have not changed.

The Charly Gaul cyclosportive covers 160 kilometres with approximately 4,000 metres of climbing across Luxembourg and the surrounding Ardennes region. No single climb exceeds three kilometres, but the course strings together dozens of short, steep walls -- many hitting 10-18% gradient -- with just enough recovery between them to let your heart rate drop before the next one drags it back up. The character is closer to Liege-Bastogne-Liege than to the Marmotte. This is a condensed Ardennes classic, not an Alpine grind.

This is the training framework we use with riders inside Not Done Yet who are targeting the Charly Gaul and comparable Ardennes-style sportives. A 12-week block built around the specific demands of the course: repeated short climbs, high power-to-weight surges, and the endurance to sustain that pattern for six to nine hours.

What Makes the Charly Gaul Different

The acceleration pattern. Most sportives let you find a rhythm. Alpine events give you 30-60 minutes of sustained climbing where you settle into a pace and hold it. The Charly Gaul gives you two minutes of searing effort up a 14% wall, ninety seconds of descent, four minutes of rolling recovery, then another wall. Then another. The pattern repeats for the entire day. Your body never reaches a steady state -- it oscillates between high-intensity surges and partial recovery, accumulating fatigue in a way that sustained climbing does not.

The gradient, not the length. A 2km climb at 14% average is a fundamentally different effort to a 14km climb at 6%. The short, steep walls on this course demand 1-3 minute power outputs well above FTP. On a long Alpine climb you can ride at 85% FTP and survive. On a wall at 15%, you are often at 110-120% FTP just to maintain forward motion at a reasonable cadence. The muscular cost of repeated above-threshold efforts compounds across the day in ways that steady-state climbing does not.

The cumulative toll. Four thousand metres spread across dozens of walls is physiologically more expensive than four thousand metres spread across four long climbs. Every wall requires acceleration from low speed, a neuromuscular punch to get over the top, and a brief recovery that never fully repays the debt. By the final third of the course, your legs carry the residue of fifty or sixty above-threshold efforts. Riders who have not trained this specific pattern find the last 40 kilometres brutally hard -- not because any individual climb is worse, but because the accumulated fatigue has eroded their capacity to produce short, sharp power.

The Ardennes atmosphere. Luxembourg is compact, green, and surprisingly hilly. The roads wind through dense forest, drop into river valleys, and kick up through small villages perched on ridgelines. The spectators are knowledgeable -- this is a country that takes cycling seriously. The feed stations are well stocked. The organisation is typically efficient in the way you would expect from a wealthy, well-run small nation. It is a civilised suffering.

The Key Climbs

The Charly Gaul course features dozens of categorised and uncategorised climbs. These are the ones that define the character of the ride and the ones you should study before you start.

Cote de Bourscheid (2.4km, 8.5% average, pitches to 14%)

The Cote de Bourscheid climbs from the valley floor through a series of switchbacks that steepen as you gain altitude. The opening 800 metres are deceptive -- manageable at 6-7% -- before the road kicks up through a section that holds 12-14% for 400 metres. The temptation is to push the early section. Resist it. Target 90-95% FTP for the first half and save the effort for the steep pitch where you will need 110-115% FTP regardless of how you pace it. Use the climb time calculator to estimate your split based on current fitness.

Cote de Heiderscheid (1.8km, 10.2% average, pitches to 16%)

Shorter than Bourscheid but steeper and more relentless. The gradient rarely drops below 9% and the final 500 metres hold 14-16% through a narrow lane between hedgerows. This climb is a pure power-to-weight test. A 75kg rider at 3.0 W/kg produces 225 watts sustained -- on a 16% pitch at 60 RPM in a 34x34 gear, that rider is close to the limit. Consider this climb when deciding your cassette choice.

Cote de Kautenbach (2.1km, 9.1% average, pitches to 15%)

Kautenbach arrives in the middle third of the course when fatigue is building. The climb follows the river valley before turning sharply uphill through forest. The gradient is inconsistent -- 7% for 200 metres, then 15% for 100 metres, then back to 8%. This inconsistency is harder to pace than a steady gradient because you cannot settle into a rhythm. Target an average power of 95-100% FTP across the full climb, accepting that the steep pitches will push you to 115% and the easier sections will let you recover to 85%.

The Unnamed Walls (0.5-1.5km, 12-18% average)

Between the named climbs, the course threads through a dozen or more unnamed walls -- short, vicious ramps of 500 metres to 1.5 kilometres that appear around a bend with no warning. Several hit 18% gradient. These walls are where the race is won or lost, because they are the efforts that accumulate without fanfare. You will not remember their names. You will remember the feeling of cresting the fifteenth one and realising there are fifteen more to come.

Fitness Benchmarks

Your power-to-weight ratio and your ability to repeat short, hard efforts predict your experience on this course more than any other metric. Check your VAM calculator output against these targets.

| Target | W/kg (sustained) | 1-Min Power | 5-Min Power | Long Ride Capacity | Notes | |--------|------------------|-------------|-------------|-------------------|-------| | Strong | 3.5+ W/kg | 7.0+ W/kg | 5.0+ W/kg | 160km with 3,000m+ | Can attack walls and recover between them. Targeting sub-7 hours. | | Comfortable | 3.0-3.4 W/kg | 6.0-6.9 W/kg | 4.2-4.9 W/kg | 140km with 2,500m+ | Manages walls at sustainable effort. Finishes 7-9 hours. | | Completion | 2.5-2.9 W/kg | 5.0-5.9 W/kg | 3.5-4.1 W/kg | 120km with 2,000m+ | Survives the walls with conservative pacing. 9-11 hours. |

Three metrics to track across your preparation:

1. 1-minute peak power -- this is the single best predictor of how you will handle the steep pitches. Test it monthly with a full-gas 1-minute effort from a rolling start on a steep hill. Track it alongside your training load.

2. Repeatability -- can you produce 90% of your 1-minute peak power on the sixth effort as well as the first? Test this with 6 x 2-minute hill repeats at maximum sustainable effort with 3-minute recovery. If your sixth effort drops below 85% of your first, your repeatability needs work.

3. Endurance under fatigue -- your TSS for a 5-6 hour training ride with significant climbing tells you whether your aerobic base can absorb the cumulative workload. Target a TSS of 280-350 for a long hilly ride without falling apart in the final 90 minutes.

The 12-Week Training Structure

Twelve weeks is enough time to build the specific fitness this event demands, provided you arrive at week one with a baseline of 6-8 hours per week of riding and at least one ride of 100km or more in the previous month. If you do not have that base, add four weeks of general endurance riding before starting this block.

Phase 1: Endurance Base (Weeks 1-4)

Volume: 8-10 hours/week. Three to four rides, with 70% of volume in Zone 2 and the remainder in Zone 3.

The purpose of this phase is to build the aerobic foundation that allows you to absorb the intensity in later phases without breaking down. Long rides get progressively longer. You introduce hills but do not attack them yet.

Weekly structure:

• Tuesday: 60-75 minutes Zone 2, flat or rolling
• Thursday: 75-90 minutes with 20-30 minutes accumulated at Zone 3 (tempo)
• Saturday: 2.5-4 hours progressive long ride with as much elevation as available
• Sunday (optional): 60-90 minutes easy recovery spin

Quality session -- Tempo with hills: Ride 90 minutes total. After a 20-minute warm-up, ride 3 x 8 minutes at 80-85% FTP on a rolling course, targeting hills where possible. Recover 4 minutes between efforts. This teaches your body to sustain moderate intensity on varied terrain without over-cooking the climbs. Use the Race Predictor to benchmark your current capacity against the event demands.

Long ride progression: Week 1: 90km. Week 2: 105km. Week 3: 120km. Week 4: 100km (recovery week). Seek routes with 1,500-2,000m of climbing by week 3.

Phase 2: Specific Build (Weeks 5-8)

Volume: 9-12 hours/week. Four to five rides, with intensity shifting towards race-specific efforts.

This phase introduces the two sessions that matter most for the Charly Gaul: hill repeats and tempo with surges. These sessions train the specific energy systems the course demands -- the ability to produce high power on steep gradients and recover enough to do it again.

Weekly structure:

• Tuesday: Hill repeats (key session 1 -- see below)
• Wednesday: 60-75 minutes Zone 2 recovery
• Thursday: Tempo with surges (key session 2 -- see below)
• Saturday: 3.5-5 hours long ride with race-specific climbing
• Sunday (optional): 60-90 minutes easy spin or strength session

Key session 1 -- Hill repeats: Find the steepest hill you can access that takes 2-3 minutes to climb. Warm up for 20 minutes. Ride 6-8 repeats at 110-120% FTP, seated where possible to build the specific muscular endurance the walls demand. Recover by descending and spinning easy for 3-4 minutes. Cool down for 10 minutes. Progression: Week 5: 6 repeats. Week 6: 7 repeats. Week 7: 8 repeats. Week 8: 6 repeats (recovery week).

Key session 2 -- Tempo with surges: Ride 90-100 minutes total. After warm-up, ride 40-50 minutes at 75-80% FTP on a rolling course. Every 6-8 minutes, surge to 110-115% FTP for 30-45 seconds, simulating hitting a wall mid-tempo. Recover back to tempo immediately -- do not soft-pedal. This session trains the acceleration-recovery pattern that defines the Charly Gaul course. Track the session with your TSS calculator.

Long ride focus: Weeks 5-7 should include your longest rides of the block -- 130-150km with as much vertical as you can find. If you live in flat terrain, repeat the same hill circuit to accumulate 2,500-3,000m. Week 8 is a recovery week: drop volume by 30% and drop intensity to Zone 2 only.

Phase 3: Sharpening (Weeks 9-10)

Volume: 8-10 hours/week. Maintain intensity but begin reducing volume.

The fitness is built. These two weeks sharpen the specific systems and begin the process of absorbing the training load so that it converts to performance on race day.

Weekly structure:

• Tuesday: Hill repeats -- 5-6 repeats at 115-125% FTP. Shorter than Phase 2 but slightly harder.
• Thursday: Race simulation (key session 3 -- see below)
• Saturday: 3-4 hours at race pace with targeted efforts on climbs
• Recovery rides as needed

Key session 3 -- Race simulation: This is a 3-3.5 hour ride that compresses the race pattern into a shorter format. Ride the first hour at 65% FTP. Then ride 90 minutes on the hilliest route you can find, hitting every climb at race effort (95-105% FTP average, with pitches at 115-120% FTP). Finish with 30-45 minutes at 70% FTP on tired legs. The purpose is to practise pacing under fatigue and to rehearse your nutrition strategy for the event. Use the power-speed calculator to calibrate your effort targets.

Phase 4: Taper (Weeks 11-12)

Volume: 5-7 hours/week. Reduce volume by 40-50% while keeping two short, sharp sessions to maintain neuromuscular sharpness.

Week 11:

• Tuesday: 4 x 2-minute hill repeats at 110-115% FTP. Short, sharp, done.
• Thursday: 60 minutes with 3 x 5 minutes at 85-90% FTP. Controlled.
• Saturday: 90-120 minutes easy with 2-3 short efforts at race pace to stay sharp.

Week 12 (race week):

• Monday/Tuesday: 45-60 minutes easy Zone 2
• Wednesday: 30 minutes easy with 3 x 30 seconds at race pace. Openers.
• Thursday: Rest or 20-minute spin
• Friday: Rest. Travel if needed.
• Saturday/Sunday: Race day

Do not add volume in the taper. Do not add intensity. Do not test your fitness. Trust the twelve weeks of work. The taper feels wrong -- you feel sluggish, heavy, and slow. That is the fatigue dissipating. Your body is absorbing the training. By race morning, the legs will be there.

Strength Work

One to two strength sessions per week during Phases 1 and 2, dropping to one session in Phase 3 and none in Phase 4. Focus on single-leg work that supports the demands of steep climbing without the injury risk of heavy barbell movements.

Key exercises:

• Walking lunges: 3 x 12 each leg
• Bulgarian split squats: 3 x 10 each leg
• Single-leg press: 3 x 12 each leg
• Step-ups (high box, 40-50cm): 3 x 10 each leg
• Core stability: side planks, pallof press, dead bugs -- 2-3 sets of 30-45 seconds each

These exercises build the hip and knee stability required for sustained seated climbing on steep gradients, where lateral stability under load becomes a genuine performance factor.

Fuelling: The Repeated-Effort Problem

Fuelling for the Charly Gaul is more demanding than fuelling for a comparable Alpine event at the same total elevation. The reason is intensity. Every wall pushes you above threshold, and above-threshold efforts burn glycogen at roughly double the rate of steady-state endurance riding. Over 160km with 4,000m of climbing, the total energy expenditure for a 75kg rider sits between 5,000 and 6,500 kilojoules depending on pace. You cannot carry that much fuel. You must eat relentlessly from the start.

Target: 80-90g of carbohydrate per hour from kilometre one. Use the fuelling calculator to calculate your specific requirements based on bodyweight and target intensity.

| Segment | What to Eat | Notes | |---------|------------|-------| | Hours 1-3 | Drink mix (40-50g/hr) + 1 bar or rice cake per hour | Eat aggressively while absorption is strong and the effort feels easy. | | Hours 4-6 | Drink mix + alternate between gels and solid food each hour | Vary texture to maintain palatability. Start gels earlier if stomach tightens. | | Hours 7-9 | Gels and drink mix primarily | Gut function declining. Liquid carbs absorb fastest. Small bites of solid food if tolerable. |

Pre-race nutrition: Eat a carbohydrate-rich breakfast 3-4 hours before the start. 100-150g of carbohydrate from familiar sources -- porridge with banana and honey, toast with jam, a rice-based meal. Nothing new on race morning.

Hydration: Target 500-750ml per hour depending on temperature. Late August in Luxembourg can range from 15C and damp to 28C and humid. Adjust accordingly. Use the hydration calculator to dial in your specific needs. Add sodium to your bottles -- 500-700mg per litre -- particularly if conditions are warm.

Feed stations: The event typically provides well-stocked feed stations every 30-40km. Use them to refill bottles and grab extra food, but do not rely on them as your primary fuel source. Carry your own nutrition plan and treat the feed stations as supplements.

Gearing

The steep gradients on this course demand lower gearing than most riders use in training. Check your setup with the gear ratio calculator before you travel.

Recommended setup:

• Crankset: Compact (50/34). Do not ride a semi-compact (52/36) unless your FTP exceeds 4.0 W/kg.
• Cassette: 11-34 minimum. 11-36 recommended for riders under 3.5 W/kg or over 80kg.
• Chain: Ensure your chain length accommodates the big-big combination if you run a 36-tooth cassette. Test this before you travel.

The maths: A 75kg rider on a 15% gradient in a 34x34 gear at 60 RPM produces approximately 310 watts. That is above threshold for most sportive riders. Dropping to a 34x36 at the same cadence reduces the power requirement to roughly 285 watts -- a meaningful difference across fifty climbs. The 30 seconds per climb you might lose in speed is irrelevant compared to the muscular cost of grinding a gear that is too heavy on the fortieth wall.

Tyre choice: 28mm is the sweet spot for this course. The road surfaces vary from smooth national roads to rougher communal lanes. Wider tyres absorb the rough sections without meaningful speed penalty. If your frame clears 30mm, that is a sensible choice for comfort over 160km.

Kit and Logistics

Weather: Late August and early September in Luxembourg typically sees temperatures between 15-25C, with the possibility of rain at any time. The Ardennes region sits at moderate altitude (300-550m) and weather can change across the course. Mornings are often cool, afternoons can be warm.

What to wear:

• Start with arm warmers and a gilet if the morning temperature is below 18C. Both are easy to stow.
• Bib shorts are fine for most conditions. Pack a lightweight rain jacket in your pocket or jersey if rain is forecast -- wet descents in the Ardennes at 15C are properly cold.
• Sunscreen regardless of cloud cover. Six to nine hours of exposure adds up.

Travel: Luxembourg is well served by direct flights from most European hubs. Luxembourg City is compact and bike-friendly. A hire car gives you flexibility to recce the course but is not essential -- the country is small enough that a taxi or train can get you to the start. Accommodation in the Ardennes towns fills up around the event, so book early. Ettelbruck, Diekirch, and Vianden are all within range of the course and offer decent options.

Bike logistics: If flying, a bike box or bag and early booking with the airline. If driving from the UK, the Eurotunnel or ferry to Calais puts you roughly four hours from Luxembourg by motorway. Many riders combine the trip with a long weekend of riding in the Ardennes.

Race Day Pacing

The single biggest mistake riders make in the Charly Gaul is pacing the first third too hard. The walls feel manageable when your legs are fresh. They feel very different at kilometre 120. Split your race into thirds and pace accordingly.

Kilometres 1-55: Discipline. Ride the opening climbs at 90-95% FTP maximum, even though you feel strong enough to push harder. Ride the flat and rolling sections between climbs at 60-65% FTP. Eat and drink consistently. This section is about banking discipline, not fitness. Your goal is to arrive at kilometre 55 feeling like you could have ridden harder. That feeling is correct.

Kilometres 55-110: Controlled effort. The middle third is where the race begins. The climbs are familiar in character now but fatigue is building. Ride the walls at 95-100% FTP on the steeper pitches, accepting brief surges to 110% on the worst gradients. Between climbs, target 65-70% FTP. Do not chase riders who are going harder than you -- many of them will come back to you in the final third. Continue eating. This is where most riders start to under-fuel because the effort suppresses appetite. Force it down.

Kilometres 110-160: Truth. The final fifty kilometres reveal whether your preparation was right. The climbs have not changed but your capacity to respond has. Ride each wall at the effort you can sustain and recover from -- this may be 95% FTP or it may be 80% FTP depending on how the day has gone. Between climbs, spin easy and eat whatever you can stomach. The riders who paced the first two thirds conservatively are the riders who still have the neuromuscular capacity to punch over these walls. The riders who went out hard are walking.

Use the Race Predictor to model your target time and power distribution across the full course before race day.

Common Mistakes

Starting too hard on the early climbs. Fresh legs and the adrenaline of the start line push riders into efforts they cannot repeat fifty times. The first wall at 115% FTP feels fine. The fortieth wall at 115% FTP is where you discover you have been borrowing from the final quarter all day. Ride the opening climbs at 90-95% FTP and trust that the restraint pays dividends at kilometre 130.

Under-gearing the bike. Pride has no place on an 18% gradient at kilometre 140. Riders who bring a semi-compact crankset or an 11-28 cassette to this event spend the second half of the course grinding at 50 RPM, destroying their quadriceps on every wall. Fit the gears you need, not the gears you think you should ride.

Neglecting fuelling after the halfway point. The effort pattern of this event suppresses appetite more aggressively than steady-state riding. By hour five, many riders have dropped from 80g/hr of carbohydrate to 30g/hr without realising it. The consequence arrives 60-90 minutes later as a catastrophic energy drop. Set a timer on your bike computer to remind you to eat every 20 minutes. Gels become your primary fuel source in the final third -- they require minimal chewing and absorb quickly.

Training only long climbs. If you live near a 10km hill and your training consists of repeated rides up it, you are training for the wrong event. The Charly Gaul demands repeated 1-3 minute efforts with incomplete recovery. Find short, steep hills and do repeats. If you have no hills at all, use turbo sessions with 2-minute maximal efforts and 3-minute recovery to simulate the demand. The specificity of training matters more than the total volume.

Frequently Asked Questions

These are the questions we hear most from riders inside Not Done Yet who are preparing for the Charly Gaul cyclosportive.

Can I do this event on a gravel bike? You can, but it is not ideal. The course is entirely on tarmac and a road bike with 28mm tyres gives you the best balance of speed, comfort, and gearing range. A gravel bike with road tyres is fine if that is what you have -- the gearing may actually be an advantage. But dedicated gravel tyres (40mm+) will cost you speed on the flat sections and descents, adding 30-60 minutes to your total time.

How many hours should I expect it to take? For a rider at 3.0 W/kg with good pacing, expect 7-8.5 hours of riding time plus stops. Stronger riders (3.5+ W/kg) can target 6-7 hours. Riders at 2.5-2.9 W/kg should plan for 9-11 hours including feed stops. The event has generous time limits but the final cut-off is firm -- check the event website for the specific time and work backwards from there.

Is a power meter essential? Not essential, but seriously useful. The pacing demands of this event -- restraint early, controlled effort in the middle, survival at the end -- are much easier to execute with power data than by feel alone. Heart rate is a reasonable substitute for pacing on the flat sections, but on short, steep climbs your heart rate lags too far behind the effort to be useful for real-time pacing. If you have access to a power meter, use it.

Should I taper for two weeks? Yes. The 12-week structure in this guide includes a progressive taper across weeks 11 and 12. Week 11 reduces volume by 30% while keeping two short, sharp sessions. Week 12 reduces further and includes only openers on Wednesday. Riders who maintain high training load into the final week arrive at the start line fatigued rather than fresh. The fitness adaptations from training take 10-14 days to fully absorb -- a two-week taper gives your body time to convert the work into performance.

What if I live somewhere completely flat? You can still prepare effectively. Indoor hill repeats on a smart trainer set to 10-15% gradient simulate the muscular demands well. Outdoors, bridge ramps, car park ramps, motorway overpasses, and even headwind intervals can provide resistance training that transfers to climbing. The key is training the 1-3 minute effort pattern with incomplete recovery, not training on actual hills. Riders from the Netherlands and Denmark complete Ardennes sportives every year using creative flat-terrain training.