Unbound Gravel 200
The defining gravel race in the world. 206 miles of Flint Hills gravel (the event billed as the 200), June heat and humidity, and long self-supported stretches between sparse checkpoints where the sodium deficit decides your day.
The Quick Answer
At Unbound Gravel 200, plan 700 to 1000 mg sodium per hour, with salty sweaters at 1000 to 1400 mg across the hot middle of the day. Checkpoints sit 50-plus miles apart, so carry capsules plus drink mix for each full segment and pre-load 1500 to 2000 mg sodium in the 24 hours before the June start.
Course Profile
Where The Sodium Math Bends
Schematic profile · Cramping windows tend to cluster around major climbs and the descents that follow them
Climate Window
60-92°F · high humidity
Climate
hot + humid
Humidity
high
Cutoff
~21 hours (3:00 AM)
Why This Race Is Hard For Sodium
The Cumulative Deficit Window
Unbound is the purest sodium-limited event on this list. June in the Flint Hills means heat into the 90s with real humidity, a 10 to 18 hour day in the saddle, and a course where the few checkpoints are 50-plus miles apart. Those long self-supported stretches are exactly where the deficit compounds, because you can only carry so many bottles and the heat drives sweat rates well past what most riders plan for. The terrain is relentless punchy climbing on chunky gravel with no sustained recovery, so effort and sweat stay high. Salty-sweater cramping is the most common reason strong riders fall apart or DNF, and it almost always traces back to under-dosing sodium across a long checkpoint-to-checkpoint segment earlier in the day. Mud years and heat years both raise the stakes: when the pace slows, time on course goes up and total sweat loss climbs with it.
Key Considerations
- Checkpoints are 50+ miles apart. Carry enough sodium for the whole segment; you cannot top up mid-stretch, so plan capsules plus drink mix per leg.
- June Flint Hills heat and humidity push sweat rates high. Salty sweaters should plan 1000 to 1400 mg sodium per hour across the hot middle of the day.
- Pre-load aggressively. Add 1500 to 2000 mg sodium in the 24 hours before the start to protect plasma volume before the first long self-supported leg.
- Slower mud or heat years mean more hours on course and more total sweat loss. Budget extra sodium and fluid for a finish time longer than your best-case estimate.
Plan the five systems
Free Tools, Pre-Filled For Unbound 200
Tap any tool. We pre-load your event, climate, and sweat profile. Adjust your weight and finish target and the plan generates instantly.
Sodium plan
Per-hour sodium and fluid targets for Unbound 200 conditions.
Carb fueling
Hourly carb targets and a fuel menu calibrated to your weight and the Unbound 200 duration.
Heat protocol
10-14 day adaptation plan if you're racing into humidity.
Hydration audit
Weigh-in test that converts a 60-minute training session into a measured sweat rate.
Caffeine timing
Pre-race dose, mid-race top-ups, and race-week taper protocol for Unbound 200 timing.
Related Reading
Dig Into The Science
How to Make Your Own Sports Drink Powder (2026)
Make your own endurance sports drink: carb ratios, sodium targets, osmolarity, and why I add Beetroot Pro to every bottle. Saves $1,800 a year vs Maurten.
Best Supplements for Leg Cramps in Endurance Athletes (2026)
The 5 supplements that prevent leg cramps in cyclists, runners, and triathletes, ranked by evidence: magnesium, potassium, beta-alanine, creatine, taurine.
Best Supplements for Energy in Endurance Athletes
The best energy supplements for endurance athletes: dietary nitrate, caffeine, creatine, and beta-alanine. Different mechanisms that stack cleanly.
Your Unbound 200 Plan,
Built From Real Data.
Pro unlocks: measured sweat-rate distributions from Unbound finishers across heat and mud years, your spring heat-training rides matched to the Flint Hills profile from Strava, and a checkpoint-to-checkpoint sodium and fluid plan calibrated to each long self-supported segment.
- Measured sweat rate from a Strava ride or weigh-in test
- Per-leg sodium schedule keyed to the course profile
- Multi-event race calendar across the season
- Post-race feedback capture so the next plan is sharper
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Common Questions
About Unbound 200
How much sodium should I take per hour at Unbound Gravel 200?
For an average rider in typical June heat, 700 to 1000 mg per hour is the working window. Salty sweaters routinely need 1000 to 1400 mg per hour across the hot middle of the day. Because the heat and the distance are both extreme, most riders under-estimate this; use the calculator with your weight and sweat profile to dial it in.
How do I carry enough sodium between checkpoints?
Unbound checkpoints can be 50 to 70 miles apart, which is 3 to 5 hours of riding. Plan each segment as a unit: combine electrolyte drink mix in your bottles with sodium capsules so you are not relying on bottle volume alone. Many riders run a fixed capsule schedule (for example one 300 to 400 mg capsule every 45 minutes) on top of their mix.
Does Unbound require pre-race sodium loading?
Yes, more than almost any US race. The combination of a 10 to 18 hour effort, June heat and humidity, and long self-supported stretches makes pre-loading high leverage. Add 1500 to 2000 mg sodium across the 24 hours before the start, weighted toward the night-before dinner and race-morning breakfast.
How long does it take to finish Unbound Gravel 200?
On the 206.9-mile 2026 course, Mads Würtz Schmidt won the men's race in 9:14:51 (22.4 mph) and Sofia Gomez Villafane won the women's race in 10:31:37 (19.7 mph). Elite fields finished in roughly 9 to 14 hours, most age-group finishers take 12 to 16 hours, and the hard cutoff is about 21 hours (3:00 AM). Your sodium and fluid plan should be built for the finish time you realistically expect, because a slower day means more hours sweating in the heat and a larger total deficit.