SiS Beta Fuel for Triathlon Performance

26th Nov 2025

SiS Beta Fuel delivers up to 120g of carbs/hour using an advanced 1:0.8 maltodextrin-to-fructose ratio. This dual-source formula boosts endurance, reduces gut distress, and improves power output. Learn how to fuel swim, bike, and run segments with science-backed precision.

Why Nutrition is the Fourth Discipline in Triathlon

Triathlon isn't just about swimming, cycling, and running; nutrition is the silent fourth discipline. With races ranging from Olympic to Ironman distances, your body's glycogen stores alone won't last. You need a fuelling strategy that supports endurance, reduces fatigue, and enhances performance.

The Science Behind SiS Beta Fuel

The all-new Science in Sport Beta Fuel uses a 1:0.8 ratio of maltodextrin to fructose upgraded from the previous 2:1 ratio to maximise carbohydrate oxidation while minimising gastrointestinal issues.

Key performance gains:

17% more exogenous carb oxidation
3% higher mean power during repeated sprints
Increase in oxidised carbs from 62% to 74%
Less stomach discomfort compared to 2:1 blends

This precision fuelling is proven to support elite-level effort without crossover to fat metabolism even after 3 hours of continuous exertion.

How to Fuel Each Segment of a Triathlon

Swim: Start Smart

You can't fuel mid-swim, but you can prepare:

Before the start: Take 1x SiS Beta Fuel Gel 40g carbs
Optional: Carry a gel in your wetsuit sleeve uncommon but possible

Bike: Your Nutrition Powerhouse

The bike segment is your best chance to front-load fuel:

Start fuelling within 10 minutes of getting on the bike
Use frame-mounted bottle cages and storage pouches

Suggested bike fuelling:

1x 500ml bottle with Beta Fuel Powder = 80g carbs
2x Beta Fuel Chew Bars (40g each) = 80g carbs

Total = 160g carbs during the bike

Run: Precision Fuelling Under Pressure

Running is where GI issues often spike. The 1:0.8 carb ratio helps prevent that.

Suggested run fuelling:

1x SiS Beta Fuel Gel with Nootropics = 40g carbs

Bonus: Nootropics help with mental clarity for the final push.

Sample Strategy for Standard Triathlon (2.5 hrs)

Segment	Product	Carb Amount
Swim	Beta Fuel Gel	40g
Bike	Beta Fuel Powder + Chews	160g
Run	Beta Fuel Gel w/ Nootropics	40g
Total		240g

Test this plan in training to fine-tune digestion and absorption.

Fuel Better, Race Harder: A Final Word

Nutrition isn't optional. It's performance-critical. The SiS Beta Fuel range offers:

Flexible intake formats (powder, gels, chews)
High-carb delivery (up to 120g/hr)
Clinically proven absorption & minimal GI distress

Practice this system in your long workouts to optimise race-day performance.

Optimise Your Triathlon Nutrition Strategy

Science-backed fuelling with Beta Fuel is your edge. Use training days to simulate race intensity and nutritional load.

Frequently Asked Questions

1. How much carbohydrate should I consume during a triathlon?

Endurance athletes should target 80–120g of carbs per hour. This depends on race duration and individual gut tolerance.

2. Can I take SiS Beta Fuel during the swim?

Not during, but take a gel just before the swim. If needed, stash one in your wetsuit sleeve for longer swims.

3. Why use a 1:0.8 maltodextrin-to-fructose ratio?

This optimised ratio increases carb oxidation, reduces GI distress, and allows faster absorption than traditional 2:1 blends.

4. What’s the best way to fuel during the bike?

Use a combo Beta Fuel Powder in bottles + Chew Bars. Begin fuelling within 10 minutes on the bike.

5. Do I need to fuel during the run?

Yes, especially in longer races. Use Beta Fuel Gel with Nootropics to support both body and brain.

6. How can I avoid stomach issues with high-carb fuelling?

Train your gut by practising race-day fuelling during workouts. Start with lower doses and increase gradually.

Key Takeaways

SiS Beta Fuel enables 120g carbs/hour using a dual-source formula
New 1:0.8 ratio improves absorption and comfort
Strategy varies per triathlon segment bike is best for fuelling
Gels with nootropics enhance focus in the final push
Trial your race plan in training to avoid surprises