NutritionAnswer

WHAT SHOULD YOU DRINK WHILE CYCLING?

By Anthony WalshRoadman CyclingUpdated 10 July 2026

ANSWER

For rides under 60-90 minutes, plain water is sufficient. For rides over 90 minutes or in hot conditions, use an electrolyte drink containing 500-700mg sodium per litre plus 30-60g carbohydrate per 500ml bottle. Aim for 500-750ml per hour in temperate conditions and up to 1,000ml per hour in heat. Drink before you feel thirsty — by the time thirst kicks in, you are already 1-2% dehydrated. A 2% loss in body weight from dehydration reduces aerobic performance by 6-10%. Electrolyte tablets or powder added to water are a practical, low-cost solution.

KEY TAKEAWAYS

500-750ml per hour in temperate conditions; up to 1,000ml in heat.
Water is fine for rides under 90 minutes; add electrolytes and carbs for longer rides.
Sodium is the critical electrolyte — aim for 500-700mg per litre of fluid.
A 2% bodyweight loss from dehydration reduces performance by 6-10%.
Drink to a schedule, not to thirst — thirst is a lagging indicator of dehydration.

WHO THIS IS FOR

IS THIS YOU?

The rider who only drinks water

You ride with plain water regardless of distance and want to know if that is enough.

The rider who cramps on long rides

You get cramps or feel wiped out after two hours and suspect hydration is part of the problem.

THE ROADMAN VIEW

Most riders under-drink. They carry one bottle of water on a three-hour ride and wonder why they feel awful in the last hour. The maths is simple: you lose 500-1,000ml of fluid per hour through sweat, more in heat. If you are only replacing 250ml per hour, you accumulate a litre deficit every two hours. That deficit costs watts, concentration, and recovery time.

For anything over 90 minutes, put electrolytes in at least one of your bottles. Sodium is the big one — it drives fluid absorption and prevents the diluted-blood-volume problem that comes from drinking plain water for hours. You do not need expensive products; an electrolyte tablet dissolved in a bidon does the job.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Dr Asker JeukendrupSports nutrition and hydration researcher
Fluid intake during exercise should aim to prevent more than a 2% loss of body mass from dehydration. A drink containing sodium (500-700mg/L) and carbohydrate (3-6% solution) promotes faster fluid absorption than plain water and maintains performance over prolonged exercise.
Dr Andy BlowSports hydration researcher, Precision Hydration founder
Sweat sodium concentration varies widely between individuals — from 200mg to over 1,500mg per litre of sweat. Athletes with high sweat sodium losses (salty sweat stains, cramping tendency) need higher sodium drinks and may require 1,000-1,500mg sodium per litre to maintain performance.

PRACTICAL APPLICATION

DO THIS WEEK

Set a drinking schedule
Every 15-20 minutes, take 3-4 large gulps from your bottle. This delivers roughly 150-200ml per interval, adding up to 500-750ml per hour. Set a repeating timer on your cycling computer if you tend to forget.
Use the two-bottle system for long rides
Carry one bottle of electrolyte/carbohydrate drink and one bottle of plain water. Alternate between them. The electrolyte bottle provides fuel and sodium; the water bottle lets you rinse your mouth or cool your head in heat.
Weigh yourself before and after a ride to calibrate
Weigh yourself before a ride (minimal clothing) and again after. Each kilogram lost represents approximately 1 litre of fluid deficit. Use this to adjust your drinking rate on future rides.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEDrinking only water on rides over 2 hours.
FIXPlain water does not replace the sodium lost in sweat. Prolonged water-only intake can dilute blood sodium and impair fluid absorption. Add an electrolyte tablet or powder to at least one bottle.
MISTAKEWaiting until thirsty to drink.
FIXThirst is triggered by a 1-2% fluid deficit. By then, performance is already declining. Drink on a schedule: every 15-20 minutes, regardless of thirst.
MISTAKEOver-drinking to the point of bloating.
FIXDrinking more than 1,000ml per hour in temperate conditions risks hyponatraemia (dangerously low blood sodium). Match intake to sweat rate — do not force fluid beyond what you are losing.

FAQ

FREQUENTLY ASKED QUESTIONS

Is sports drink better than water for cycling?

For rides under 60-90 minutes, water is fine. For rides over 90 minutes, a sports drink containing electrolytes and carbohydrate is more effective because it replaces sodium, provides fuel, and promotes faster fluid absorption.

How much sodium do I need in my drink?

500-700mg per litre is a good starting point. If you are a heavy or salty sweater (white salt marks on your kit), you may need up to 1,000-1,500mg per litre. Experiment in training.

Can I drink too much while cycling?

Yes. Over-hydrating — particularly with plain water — dilutes blood sodium and can cause hyponatraemia, a dangerous condition. Match your intake to your sweat rate, not a fixed target.

What about energy drinks with caffeine?

Caffeine can improve endurance performance, but carbonated energy drinks (Red Bull, Monster) are a poor choice during riding because carbonation causes bloating. Use a caffeine gel or a flat caffeinated sports drink instead.

Should I pre-hydrate before a ride?

Drinking 400-600ml of fluid with electrolytes in the 2-3 hours before a ride ensures you start well hydrated. Do not overdo it — excessive pre-hydration just means more stops.