Know what's in range · Las Vegas
Enter the forecast for when you ride. A NW wind is 315°. The rider feels about 70% of the 10 m wind, and only the head or tail part is counted. Set 0 for calm.
Between durations the curve is interpolated on a log-time scale. Under 15 s the 15 s value is used; past 60 min it tapers slowly.
Softball (blue): the KOM needs no more than this much W/kg, whatever the length or grade. You can take it without a hard effort. Descents are never softballs; handling decides those.
Power needed. Each segment's elevation profile is split into sections of about 60 m. For a trial power, the speed on each section solves P·η = m·g·v·(sin θ + Crr·cos θ) + ½·ρ·CdA·v_air²·v, with air density set by that section's altitude and your temperature. The page finds the one steady power whose section times add up to the KOM. Wind is applied section by section along the route; crosswind is ignored.
Your power. Read off your power curve at the KOM's duration. With the curve off, a three-parameter critical-power model based on FTP, W′ and peak power is used instead.
Labels. Softball means the KOM needs 2 W/kg or less (adjustable), so you can take it without a hard effort. In range means your power at that duration beats what the KOM needs. Stretch is within the band you set. Super ouchy is further out, down to 75% of the power needed. Below that it's What are you, pro? Suspect KOM marks times beyond what a world-class rider can hold for that long (about 20 W/kg for 15 s, 11 for 1 min, 7.5 for 5 min, 6.6 for 20 min, 6.2 for an hour), faster than 40 mph off a descent, or impossible at any power. Those are usually tailwinds, drafting, cars or GPS glitches. Below that line a KOM counts as real, even if only a pro could do it. KOMs slower than 5 mph that you can beat are listed as softballs: grab them and set a real time. Short flat sprints are often set in a paceline.
Location. A ZIP uses the centre of that ZIP. For your exact spot, long-press your home in Google or Apple Maps and paste the coordinates. Distance is measured to each segment's start. Or tap Locate me to use your phone's GPS. Your location stays on the phone.
Bike type. Each route is matched against OpenStreetMap's surface, track-grade and smoothness tags. Singletrack and rough 4×4 tracks, very twisty lines, KOMs that are much slower than the grade predicts and steep unpaved pitches point to MTB. Graded dirt roads point to gravel. The dirt share also raises rolling resistance in the power numbers: dirt road ×2, rough track ×3, trail ×3.5.
My KOMs. Tap the crown on a card to mark a KOM you hold. It's saved on this device only. Use the My KOMs menu to hide yours or show only yours.
Dead segments. Tap the headstone on a card when homes, walls or fences now block the route. Dead segments are hidden unless you switch the Dead menu to Show or Only dead, and you can tap the headstone again to restore one. A card that says "May be gone" is only a hint: its route no longer follows any road or path on the current map. It's saved on this device only.
Profiles. About half the segments have a full elevation profile. The rest use the average grade and are marked "avg grade".