The Chattanooga Bike Leg: 3 Laps on US-27 and 5,623 Feet You Don't See Coming

The Course: Three Laps on US-27

112.2 miles, or 180.5 km, with 5,623 ft of elevation gain: roughly 1,714 m, the official figure for the current course. You ride three laps of US-27, with fresh pavement and a dedicated athlete lane. The organizer's label is 'rolling': undulating, not flat. It's the right call. There are no walls, but there's almost never a stretch where the road leaves you alone. Nearly 1,700 m of climbing spread over three laps means one thing: lots of false flats and short climbs that only cost you if you ride them badly.

Watch Out for the Numbers You Find Online

Let's be clear here. The internet is full of wildly different elevation figures for this race, from around 1,300 to around 1,800 m. The reason is simple: the course has changed over the years. Older guides describe a 2-lap route toward Chickamauga that no longer exists. If you're planning your watts or picking your gearing based on a race report from a few years ago, you're planning a different race. Go with the current official number: 5,623 ft over 3 laps of US-27, and check the elevation profile published on the organizer's course page.

Pacing: The False Flats Fool You More Than the Climbs

On a lap course the temptation is obvious: a fast first lap because you're fresh and just came out of a current-assisted swim with a dream split. It's the classic mistake at this race. A fast swim in the Tennessee River doesn't make the rest fast: the bike and run are rolling, and you shouldn't revise your goals upward just because you got out of the water 10 minutes earlier than expected.

What to do in practice:

• Set a power cap (or RPE cap) for the short climbs and stick to it from the first mile.
• Use the first lap as recon: note where the road actually climbs and where it's just false flat.
• Keep your watts in check on the false flats: that's where you burn matches without noticing, not on the obvious climbs.
• Hit the third lap with margin left: that's where the marathon gets decided.

Sun and Wind: Don't Just Look at the Thermometer

From past editions, multiple race reports mention constant sun and wind from the north. In late September the average high is 27 °C, but Tennessee has a history of record heat. Translation: even at 24 °C, five or six hours in the sun with a headwind on some sections drain both fluids and focus. Plan your fluid and sodium intake on the bike from the first lap: starting the marathon in a deficit on this run course is tactical suicide. Bike aid stations stock pre-mixed Precision PH 1000 bottles and Maurten products: test them in training or bring your own plan.

Gearing: Spin, Don't Grind

On Chattanooga's old courses, the standard advice was a compact up front and at least a 26-tooth cog in the back. With 1,714 m on a rolling course, that advice still holds: an easy cadence on the false flats saves your legs for the hills on the run. Before you commit to a cassette, though, check the official elevation profile of the current course: no extreme gradients show up in the available data, but you should verify the details of the ramps against the official source.

What to Do Now

A concrete test: a 4-5 hour long ride on rolling terrain, at race-target watts, with the exact hydration strategy you'll use on September 26. If your watts fade or you stop drinking in the final 60 minutes, your target is too high. Better to find out in August than on lap three of US-27.