Chennai Duathlon Mongrels Chennai Marathon
Register Now Race Day
RACE STARTS IN
00 DAYS
00 HOURS
00 MINUTES
00 SECONDS
RUN
↗
CYCLE
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RUN
RUN
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CYCLE
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RUN
RUN
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CYCLE
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RUN
RUN
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CYCLE
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RUN
THE PACK DOESN'T SWIM

TWO RUNS. ONE HARD RIDE.
ZERO EXCUSES.

A duathlon swaps the swim for a second run — run, cycle, run. It rewards runners who can hold a bike leg and cyclists who can still move on tired legs. "Mongrels" means mixed-breed: no papers, no pedigree, just legs and grit to finish what you started.

03
RACE LEGS
02
TRANSITION
THE CLASSIC

GO LONG.
FINISH STRONG.

The full-distance challenge for athletes who want to test their speed, endurance and grit across all three legs.

Classic Duathlon
THE CLASSIC
01
RUN
10KM
Start strong.
02
RIDE
40KM
Find your rhythm.
03
RUN
5KM
Leave it all out there.
TOTAL DISTANCE
55 KM
Sprint Duathlon
THE SPRINT
THE SPRINT

SHORTER.
STILL SAVAGE.

Built for first-timers and fast movers. Same three-leg challenge — just condensed into a sharp, high-energy race.

01
RUN
5KM
Open the race.
02
RIDE
20KM
Push the pace.
03
RUN
2.5KM
Finish fearless.
TOTAL DISTANCE
27.5 KM

Moments In Motion
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels
Mongrels

Chennai Duathlon by Mongrels

Chennai Duathlon is one of Chennai’s most exciting endurance sporting events, bringing together runners, cyclists, fitness enthusiasts, and athletes from across the city and beyond. What began as a passion for creating a challenging yet enjoyable
multisport experience has grown into an event that celebrates fitness, determination, community, and the spirit of competition...

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Rider Stories

Memories from the Duathlon community

“
My first duathlon and I was honestly nervous. But the atmosphere made everything so much easier. I finished with a huge smile!
Arun Kumar
EVENT2015
“
The cycling was tough, but the energy around the course kept me going. Such a fun experience from start to finish.
Priya S
EVENT2016
“
I came with my friends and we had an amazing time. Challenging, yes, but crossing that finish line together was worth it.
Vignesh R
EVENT2017
“
What I loved most was the vibe. Everyone was pushing themselves, but there was still a great sense of community.
Deepa M
EVENT2019
“
After the break, coming back in 2022 felt really special. Great energy, great people and a proper challenge.
Rahul S
EVENT2022
“
You don't need to be a professional athlete. Just come prepared, give your best and enjoy the experience. That's what I did!
Nandhini K
EVENT2022
“
Running and cycling in one event was completely different for me. It pushed me outside my comfort zone in the best way.
Karthik P
EVENT2019
“
The finish line feeling was incredible. I went home tired, happy and already thinking about doing it again!
Swetha R
EVENT2017
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Ready to push your limits? Register now and take a step towards a stronger, healthier you.

 Register Now

FAQ

What is the Chennai Duathlon?

The Chennai Duathlon is an endurance event that combines running, cycling and running in one race. Participants will complete a run, followed by a cycling segment, and finish with another run.
What are the distances for the Chennai Duathlon?

CLASSIC: 10 KM Run → 40 KM Cycle → 5 KM Run
SPRINT: 5 KM Run → 20 KM Cycle → 2.5 KM Run
Who can participate in the Chennai Duathlon?

The event is open to participants who are physically capable of completing the run and cycling distances. Participants should have basic running and cycling experience and be prepared for an endurance event.
Do I need to be an experienced athlete to participate?

No. You don't need to be a professional athlete. However, participants should be reasonably fit and comfortable running and cycling. We strongly recommend training before the event.
Can I register for someone else?

Yes, you can register another participant, but make sure all participant details and contact information are entered correctly during registration.
Can I cancel my registration or get a refund?

Registrations are subject to the event's cancellation and refund policy. Please review the terms and conditions before completing your registration.
Can I transfer my registration to another person?

No. Registrations are non-transferable unless the organizers specifically announce otherwise.
What will I receive after registering?

Registered participants will receive their event-related details, including information regarding bib collection, race-day instructions, reporting time, route and other important updates closer to the event.