Ironman UK: Official Cutoffs and Will You Make Them?
Bolton, England. Rolling self-seeded lake start at Pennington Flash, Wigan. Full Ironman (140.6) distance: 3.8km swim / 180.2km bike / 42.2km run.
Official Cutoff Gates
| Gate | Elapsed from your individual start | Notes |
|---|---|---|
| Swim + T1 | 2:20:00 | On the bike out of T1 |
| Bike (cumulative) | 10:30:00 | Off the bike, starting the run |
| Overall finish | 17:00:00 | Across the finish line |
Source: 2023 IRONMAN UK Athlete Guide (opens in a new tab) (retrieved 2026-07-16). All cutoffs are elapsed time from your individual start chip, not the fixed race clock. These are the official published cutoffs as of 2026-07-16; always verify in the current athlete guide before racing, as organisers can revise them each season.
Will you make the cutoffs at your pace?
Enter your projected swim pace, bike speed and run pace below to see your margins against the official Ironman UK gates. The calculator is pre-loaded with the verified cutoffs.
Your projected splits
Enter realistic race-day paces — including transitions — to see your margins.
Course and Start Notes
Two-lap lake swim at Pennington Flash, a rolling Lancashire bike with three intermediate bike cutoffs tied to the traffic plan, and a Bolton town-centre run. Standard full-distance gates apply: 2:20 swim, 10:30 bike and 17:00 overall, all measured from your individual start.
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How this calculator works
Cutoff gates were read verbatim from the official 2023 IRONMAN UK Athlete Guide and are elapsed time from each athlete's individual start chip. The calculator compares your projected swim, bike and run splits, plus transitions, against those gates.
Assumptions
- • Cutoff gates are elapsed time from individual start chip time
- • Standard published race distances for the format
- • Clock times depend on your individual rolling-start time
Limitations
- • Cutoffs can be revised each season; confirm in the current athlete guide
- • Intermediate time-of-day checkpoints (race logistics) are not modeled per-athlete
Who this is for
- • Athletes registered for Ironman UK planning their pacing
- • Athletes comparing their projected splits to the official gates
- • Coaches building a race-day plan around the actual cutoffs
Who this is not for
- • Athletes racing a different event (each race publishes its own cutoffs)
- • Anyone relying on a fixed race clock rather than individual start time