23 Most Popular Triathlons in Belgium 2026 — by Audience Size

How to read this list

Rank

Position in the Top 23, sorted by audience size from largest to smallest. Updated weekly.

Audience size

Estimated number of unique people in Belgium who actively engage with this audience, derived from anonymized search-behavior signals.

Country share

Share of the global audience that is active in Belgium. A higher value means the audience is more locally concentrated here.

Avg age

Average age in years across the people who engage with this audience in Belgium, derived from anonymized search-behavior signals. A dash means demographic data is not yet available.

Female share

Share of women among the people who engage with this audience in Belgium. 50% is gender-balanced; values above mean female-skewed, below mean male-skewed.

Ranking

Rank	Audience	Audience size	Country share	Avg age	Female share	Subtype
1	IIronman 70.3	104k	1.6%	40.0	44.0%	Triathlon
2	IIronman World Championship	102k	1.8%	39.2	40.6%	Triathlon
3	EEscape from Alcatraz (triathlon)	19k	2.3%	35.7	39.9%	Triathlon
4	WWorld Triathlon	8k	1.4%	36.7	43.1%	Triathlon
5	MMark Allen (triathlete)	5.2k	0.8%	33.9	31.7%	Triathlon
6	UUSA Triathlon	4.1k	1.0%	43.4	38.2%	Triathlon
7	JJan Frodeno	2.1k	0.9%	36.8	36.3%	Triathlon
8	IIronman Triathlon	2k	0.2%	39.3	43.1%	Triathlon
9	IInternational Triathlon Union	1k	0.8%	41.7	38.5%	Triathlon
10	SSupertri	927	2.0%	39.6	43.6%	Triathlon
11	XXTERRA Triathlon	899	0.4%	44.0	29.0%	Triathlon
12	DDave Scott (triathlete)	761	0.7%	34.3	32.9%	Triathlon
13	CChris McCormack (triathlete)	669	1.1%	33.9	32.3%	Triathlon
14	SSarah Haskins (triathlete)	630	1.7%	33.7	33.4%	Triathlon
15	TTimothy O'Donnell (triathlete)	590	1.4%	34.3	34.2%	Triathlon
16	LLondon Triathlon	561	0.3%	42.0	28.1%	Triathlon
17	IIronman Germany	495	0.2%	44.1	25.8%	Triathlon
18	IIronman Heavymetalweight Championship	402	0.1%	43.9	100.0%	Triathlon
19	IITU Long Distance Triathlon World Championships	231	1.5%	33.7	31.0%	Triathlon
20	SSebastian Kienle	226	0.6%	35.4	0.0%	Triathlon
21	BBritish Triathlon Federation	57	0.3%	46.8	34.8%	Triathlon
22	AAndreas Raelert	54	0.8%	37.6	0.0%	Triathlon
23	PPete Jacobs (triathlete)	6	0.1%	33.9	33.3%	Triathlon

Want the full picture for any of these audiences?

Open any profile to see psychographics, top regions, peer affinities and demographic splits — all derived from the same anonymized signals.

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Frequently asked questions

How is this list of the most popular triathlons compiled?

Rascasse aggregates anonymized search-behavior signals across Belgium and ranks each triathlon by its estimated audience size. Only entries with at least 5 measured entities are listed.

How often is the list updated?

The ranking is refreshed weekly from the latest search-behavior data and re-published as a static page.

What is the largest triathlon in Belgium?

Ironman 70.3 currently leads with an estimated audience of 104k people in Belgium.

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