Bromo Tengger Semeru 100 Ultra BTS 100K (Java, Indonesia) 2027
New here or unsure of your ITRA index?
Find your index in your ITRA profile. Alternatively, try the app demo or connect Strava for a prediction from training.
Preview this race in the appSaving is explicit: up to 12 races for 180 days on this device. Saving after predicting also stores the index and result locally. Targets and training plans stay unchanged.
Saved races, comparison and updates
Also known as: BTS100
Set in the highlands of Bromo Tengger Semeru National Park in East Java. The volcanic sand sea at around 2,200m is cold and windy, and the route runs rural back roads, forest and prairie with views toward Mount Semeru, Java's highest peak, and Lake Ranu Kumbolo.
The course tops out at 2,763 m (low point 1,940 m). 6 climbs of 300 m or more keep coming; the biggest is 823 m around 78–89 km. About 40% of the distance is gentle (under 5% grade). In 2025, 80% of starters finished. The median finish was about 28 h, through 2 nights.
Predict your finish from your ITRA index
How the prediction works
Enter your ITRA performance index to get your finish time, aid-station splits and cutoff margins from the results of 20 finishers of this race — the same model as the TRAIL STATUS app. Nothing is saved automatically or sent.
The app adds predictions from your training log (Strava), race-day pacing and more. Free, no sign-up.
Predict in detail from my Strava trainingOverview
- Date
- Sat, 6 Nov 2027
- Start
- 00:01
- Location
- Indonesia
- Distance
- 100.5 km
- Elevation gain
- 4,235 m
- Time limit
- 32h
- ITRA
- 100K · 4 points
- Official website
- fonesport.id
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 5.5 km | Aid 1WS1 B29（水のみ・標高2,531m） | 5.5 km | — |
| 2 | 16.5 km | Aid 2WS2 Ranu Pane 1（標高2,120m） | 11 km | — |
| 3 | 25.5 km | Aid 3WS3 Ranu Kumbolo（標高2,350m） | 9 km | — |
| 4 | 36 km | Aid 4WS4 Ranu Pane 2（標高2,150m） | 10.5 km | — |
| 5 | 44.5 km | Aid 5WS6 Jemplang（標高2,370m・ドロップバッグ・応援者のサポート可） | 8.5 km | — |
| 6 | 57 km | Aid 6WS14 Bromo Sand（標高2,192m） | 12.5 km | Day 1 20:0120h |
| 7 | 62 km | Aid 7WS7 Dingklik（標高2,137m） | 5 km | — |
| 8 | 76 km | Aid 8WS8 Mororejo（標高2,045m） | 14 km | — |
| 9 | 88.5 km | Aid 9WS9 Pananjakan（標高2,772m） | 12.5 km | — |
| F | 100.5 km | FinishFINISH Artotel Cabin（標高2,220m） | 12 km | Day 2 08:0132h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2025 results
227 starters, 182 finishers (80.2% finish rate). Finish times of those who finished:
- Fastest
- 16h 20m
- Top 10%
- 21h 2m
- Top 25%
- 24h 44m
- Median
- 27h 35m
- Top 75%
- 29h 32m
- Top 90%
- 30h 49m
- Last finisher
- 31h 47m
"Top 25%" means one in four finishers had crossed the line by this time.
Years with a different course or different cutoffs are not directly comparable.
Other races
- Trail of the Kings Lake Toba Caldera Crown 100K (Indonesia) 2026Sat, 13 Jun 2026 · Indonesia · 101.2 km
- Trail of the Kings Lake Toba Caldera Crown 100K (Indonesia) 2027Sat, 12 Jun 2027 · Indonesia · 101.2 km
- Trail of the Kings Lake Toba Ultimate Expedition 60K (Indonesia) 2026Sat, 13 Jun 2026 · Indonesia · 64 km
- Trail of the Kings Lake Toba Ultimate Expedition 60K (Indonesia) 2027Sat, 12 Jun 2027 · Indonesia · 64 km
- Trail of the Kings Lake Toba King's Ascent 28K (Indonesia) 2026Sat, 13 Jun 2026 · Indonesia · 23.6 km
- Trail of the Kings Lake Toba King's Ascent 28K (Indonesia) 2027Sat, 12 Jun 2027 · Indonesia · 23.6 km
From your training log, TRAIL STATUS estimates your finish time, aid-station splits and cutoff margins for this race.
Predict my raceCompiled from each race's official information. Details can change, so always check the race's official website for the latest. Spotted a mistake? Please tell us through the contact form.
TRAIL STATUS · FAQ · Privacy policy
Points to consider for this course
- The overall time limit allows about 19:07/km including stops. This average does not guarantee meeting intermediate cutoffs.
- The longest gap between recorded points, including the start, is about 14 km (62–76 km). This does not list every water source.
- Read the recorded profile alongside the cutoffs. Terrain, weather and your condition can change travel time.
These are simple calculations and observations from recorded information, not personal finish probabilities or difficulty ratings.
Other editions of the same race and distance
Recorded editions match by name, official domain, format and distance range. Results and courses across editions may not be directly comparable. Check the organizer for the latest schedule.
- Bromo Tengger Semeru 100 Ultra BTS 100K (Java, Indonesia) 2026 · 2026-11-07Compared recorded values match.
Results and official information
Historical field finish rates differ from your personal prediction. This is not a live results service; check official announcements for results and changes.
Check rules and results on the official siteInformation checked: 2026-10-02