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TriSplitCalc
Triathlon Pace Engine

Chattanooga, Tennessee course planning

IRONMAN 70.3 Chattanooga Course Profile

A 70.3 profile with a fast downriver swim, rolling Tennessee bike, and riverfront run energy.

Race

70.3

Swim condition

calm

Bike condition

rolling

Run condition

rolling

Course difficulty:Hard4.7/10

Race conditions

Neutral baseline

Swim pace / 100m

:
km/h

Run pace / km

:

Race-day estimate

05:53:09

+14:07 vs neutral

Neutral

05:39:02

Buffer

+14:07

Bike speed

28.5 km/h

Run pace

5:43/km

Course adjustment notes

  • Course modifiers are planning buffers, not official course predictions.

Use this with

Full race plannerBuild a complete Ironman plan with course-adjusted pacing.Heat paceIsolate hot-weather run pacing when heat is the main risk.Cutoff bufferCheck whether the adjusted estimate still clears course closures.Race checklistTurn the race conditions into gear and transition reminders.

Course friction assumptions

Swim

Fast downriver swim

Calm / protected

Minimal friction. Focus on sighting and group dynamics.

The model stays conservative; reduce neutral swim pace manually if you want to model a favorable current.

Bike

Rolling countryside bike

Rolling terrain

5% speed penalty. Use VI discipline — avoid surging over short climbs.

Rolling terrain rewards consistent effort and relaxed cadence management.

Run

Riverfront run

Rolling / undulating

4% penalty. Effort-based pacing, walk early hills if needed.

Expect rhythm changes and pace by effort when the course rolls or crowds tighten.

Course logistics

Wetsuit

Non-wetsuittypical probability

This profile uses a non-wetsuit planning assumption. Non-wetsuit swimming relies more on body position, SightingSightingLifting the head briefly during freestyle to look forward and swim in a straight line. Critical in open water without lane lines. efficiency, and swim fitness.

Official water-temperature readings and race-day rules override any historical assumption.

Tire recommendation

Lightweight clinchers / tubeless

Rolling terrain needs low weight for short climbs and reliable cornering on descents. Tubeless setup reduces puncture risk on variable road surfaces.

Planning read

Cutoff pressure

The swim can create buffer, but the bike/run combination still requires controlled effort.

Best use

Accept free speed in the water, avoid surging the bike, and hold a patient first 5K on the run.

Key terms

WetsuitWetsuitNeoprene suit worn during the swim for buoyancy, insulation, and hydrodynamics. Legal when water temperature is below a race-specific threshold. ·Cutoff timeCutoff timeThe maximum allowed time to complete the swim, bike, or entire race. Athletes who exceed cutoffs are pulled from the course. ·Aid stationAid stationA designated point on the bike or run course where athletes can pick up water, sports drink, gels, and snacks. ·T1T1Transition 1: the zone between swim and bike where athletes remove wetsuit, put on helmet, glasses, shoes, and mount the bike. ·T2T2Transition 2: the zone between bike and run where athletes rack the bike, remove helmet, change shoes, and start running. ·Drafting (bike)Drafting (bike)Riding in another cyclist's slipstream to reduce wind resistance. Illegal in most non-draft-legal triathlons. ·Aero positionAero positionLow, aerodynamic body position on a triathlon bike or TT bike using aerobars. Reduces frontal area and wind resistance. ·SightingSightingLifting the head briefly during freestyle to look forward and swim in a straight line. Critical in open water without lane lines.

Hover or tap each term for a quick definition. Browse the full triathlon glossary.

Build this race plan

Open pre-filled course calculatorStart with this course's swim, bike, run, and wetsuit assumptions.Check cutoff bufferCompare the course-adjusted plan against official cutoff clocks.Plan aid-station nutritionTurn the estimated bike and run time into gels, bottles, carbs, and sodium.

Official source check

This profile was last checked on 2026-07-12. Course maps, venue rules, athlete-guide details, aid stations, weather plans, and cutoff enforcement can change. Before race week, verify everything against the official source.

Official IRONMAN 70.3 Chattanooga course page

More course profiles

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Related Content

70.3 Race Planner

Half-distance planning hub with splits, run-off-bike adjustment, and aid stations.

Aid-Station Nutrition

Turn splits into bottles, gels, carbs, and sodium per aid station.

Bike Split from FTP

Validate bike pacing from FTP, IF, and W/kg for this course.

Trust and methodology

How this page should be used

Last updated

July 13, 2026

Maintained by

M Imtinan Farooq

Status

Planning estimate, not a race guarantee

Formula summary

Race-day estimate = neutral splits adjusted by swim, wetsuit, bike, and run modifiers.

Key assumptions

Course labels are broad planning categories, not official segment-by-segment modeling.

Limitations

Official athlete guides, weather, route changes, and safety instructions override this page.

Full formulas, source notes, and limitation details are maintained on the methodology page. Use official race guides for event rules, cutoff times, venue policies, and safety instructions.