CoachingAnswer

HOW DO I TRAIN FOR A 100-MILE RIDE IN 12 WEEKS?

By Anthony WalshRoadman CyclingUpdated 9 July 2026

ANSWER

Train for a 100-mile ride in 12 weeks by dividing the block into three phases: base building (weeks 1-6, three to four easy rides per week with a long ride growing from 40 to 70 miles), build phase (weeks 7-10, add one tempo or sweet-spot session and push the long ride to 80 miles), and taper (weeks 11-12, reduce volume by 30-40% while keeping one short sharp session). You need a minimum of 8 hours per week by the build phase. Practise your race-day nutrition on every long ride.

KEY TAKEAWAYS

Weeks 1-6: base building. Long ride grows from 40 to 70 miles, all other rides easy.
Weeks 7-10: build phase. Add one tempo session, push long ride to 80 miles.
Weeks 11-12: taper. Cut volume 30-40%, keep one sharp session, rest into the event.
Practise your nutrition plan on every long ride — the century is as much a fuelling test as a fitness one.

WHO THIS IS FOR

IS THIS YOU?

The first-century rider

You can ride 50 miles comfortably and want a structured path to your first 100.

The sportive entrant

You have signed up for a 100-mile sportive and have 12 weeks to prepare.

THE ROADMAN VIEW

A century is not a fitness problem — it is a fuelling and pacing problem that happens to require fitness. Anthony has watched riders with an FTP of 220 watts finish 100-mile sportives comfortably while riders with an FTP of 280 bonk at mile 70 because they never practised eating on the bike. The training matters, but the nutrition rehearsal matters just as much.

The structure is simple. Spend the first six weeks building your long ride from whatever your current comfortable distance is up to 70 miles. Keep everything else easy — this is about teaching your body to sustain output for 4-5 hours. In weeks 7-10, add one session with tempo or sweet-spot effort to build the power you will hold on the day. Then taper for two weeks so you arrive fresh.

The thing most plans miss is the long-ride nutrition rehearsal. Every long ride from week three onwards should use the exact fuelling strategy you plan to use on the day — the same products, the same timing, the same bottles. The riders who finish strong at mile 90 are the ones who solved their fuelling six weeks ago, not the ones improvising at the feed station.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Dr Sam ImpeySports nutritionist
The century ride is one of the clearest cases where fuelling determines the outcome. A rider taking 60g of carbohydrate per hour from the first 30 minutes will hold power to the finish; one who waits until they feel hungry will bonk in the last quarter and no amount of fitness saves them.
Hear it: Why Pros' 120g Carb Rule Fails Amateurs | Roadman Cycling
Joe FrielAuthor of The Cyclist's Training Bible
The single most important session in century preparation is the long ride. It is the one session that cannot be replicated indoors or compressed into a shorter interval format — you need time on the saddle at the duration you will face on the day.
Hear it: Joe Friel's Cycling Training Plan Structure | Roadman Cycling

PRACTICAL APPLICATION

DO THIS WEEK

Build the long ride progressively
Start at your current comfortable long-ride distance (typically 40-50 miles for a moderately fit rider). Add 5-10 miles each week through the base phase. Peak at 75-80 miles three weeks before the event — you do not need to ride the full 100 in training.
Add one tempo session from week 7
Two blocks of 15-20 minutes at 85-90% of FTP, or an effort where you can speak only in short phrases. This builds the sustained power you will hold on the century without burying you.
Rehearse nutrition every long ride
From week three, take 60g of carbohydrate per hour on every long ride. Use the same products, same bottles, same timing you plan to use on the day. If your stomach objects, you have weeks to fix it — not miles.
Taper properly in weeks 11-12
Cut total volume by 30-40% but keep one short, sharp session (a few tempo efforts) to maintain sharpness. The extra rest lets your body absorb the training and arrive on the start line fresh, not fatigued.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKERiding the full 100 miles as a training ride two weeks before the event.
FIXPeak at 75-80 miles three weeks out, then taper. A full-distance dress rehearsal that close to the event leaves you tired, not prepared.
MISTAKENeglecting nutrition rehearsal until race day.
FIXPractise your exact fuelling plan on every long ride from week three. Gut training takes weeks, not hours.
MISTAKEStarting the century too fast.
FIXRide the first 30 miles at a pace that feels almost too easy. The century is won in the last 20 miles, and every watt you spend in the first 30 is borrowed from the finish.

FAQ

FREQUENTLY ASKED QUESTIONS

Do I need to ride 100 miles before my century event?

No. A peak long ride of 75-80 miles three weeks before the event is sufficient. The training effect of those last 20 miles does not justify the recovery cost. Taper and nutrition do the rest.

How many hours a week do I need to train for a century?

Plan for 6-8 hours per week in the base phase, rising to 8-10 in the build phase when your long ride peaks. The minimum that works is about 6 hours with smart distribution.

Can I train for a 100-mile ride on an indoor trainer?

Mostly, but you need at least some long outdoor rides to practise bike handling, nutrition, and position comfort over 4-5 hours. Indoor rides are excellent for the structured sessions but cannot fully replicate the demands of a century.

What should I eat during a 100-mile ride?

Aim for 60g of carbohydrate per hour from the first 30 minutes — gels, bars, drink mix, or real food. For a 5-6 hour ride that is 300-360g of carbohydrate total. Start before you are hungry and eat on a schedule.

How should I pace a 100-mile ride?

Start at 65-70% of FTP for the first third, hold 70-75% through the middle, and ride the last quarter on feel. If you start at 80% you will fade badly in the last 20 miles. Patience in the first hour buys power in the last.

What if I only have 8 weeks instead of 12?

Compress the base phase to four weeks, the build to three, and taper for one. You will arrive less prepared than with 12 weeks, but it is still enough to finish if you can already ride 40-50 miles comfortably.

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Joe Friel's Cycling Training Plan Structure | Roadman Cycling