Corner-by-corner guides, computed.
Entry, minimum and exit speeds, brake points, radii and elevation for every corner of 19 US circuits — produced by running a motorcycle physics simulation over each track's real geometry, then written up corner by corner.
Laguna Seca
Preview
Circuit of The Americas
Preview
Road America
Preview
Road Atlanta
Free
Barber Motorsports Park
Preview
Virginia International Raceway
Preview
Sonoma Raceway
Preview
Willow Springs (Big Willow)
Preview
Streets of Willow Springs
Preview
Buttonwillow Raceway Park
Preview
Thunderhill East
Free
The Ridge Motorsports Park
Preview
Pittsburgh International Race Complex
Preview
New Jersey Motorsports Park - Thunderbolt
Preview
Mid-Ohio Sports Car Course
Preview
Watkins Glen International
Preview
Sebring International Raceway
Preview
Thunderhill West
Preview
Thunderhill Full Course
Every corner of every guide, forever.
All 19 track guides fully unlocked, as downloadable print-ready HTML plus CSV corner tables — and free updates as new tracks are added.
$59 lifetime all-access · or $12 for a single track
TRACK OUTLINE © OPENSTREETMAP CONTRIBUTORS (ODBL)
Straight answers.
Are these real lap times or measured data?
No. Every number is a physics-simulation estimate: a quasi-steady-state point-mass motorcycle model run over each circuit's real geometry with stated tire, power and drag assumptions. Simulated liter-bike laps were checked against published motorcycle lap records and land within roughly 0–25% of them — the full comparison table is on the methodology page.
What's free and what's paid?
Three full guides — Laguna Seca, Barber Motorsports Park and The Ridge Motorsports Park — are completely free. Every other guide shows its three biggest braking-zone corners free, with full data tables on all corners. The $59 all-access pack unlocks every corner of every guide as a download; a single track is $12.
Where does the track data come from?
Circuit outlines are derived from OpenStreetMap (© OpenStreetMap contributors, ODbL). The racing line, speeds and brake points are computed on top of that geometry by our simulation — they are estimates, and the guides are independent of any track or series.
Is this riding instruction?
No. The guides are reference data for studying a circuit before you ride it. Conditions, traffic, your bike and your skill all differ from the model's assumptions. Always ride within your limits and follow your track organization's instructions.