About Graveller

Graveller helps gravel cyclists find and rate gravel-compatible roads and tracks. It currently covers all of Austria and Südtirol (plus neighbouring parts of northeastern Italy).

How the ratings work

Every road and track comes from OpenStreetMap. Graveller reads the OSM tags on each way (surface, tracktype, MTB scale, smoothness, and more) and auto-classifies it into a gravel category following the Industry Standard Guide to Gravel (ISGG):

• Cat 1 - smooth, well-maintained dirt roads with little or no loose gravel. Road-bike friendly (25-28mm tires).
• Cat 2 - potholes, washboard, and loose blown-out corners; gravel outside the tire tracks. Still fine on a road bike with some skill (28-32mm).
• Cat 3 - infrequently maintained roads: exposed rocks, tire-eating rain ruts, sand bogs. A gravel bike is the right tool (33-38mm).
• Cat 4 - unmaintained forest roads with deep ruts and rock gardens. High-volume tires required (38-42mm).
• Not gravel-bike compatible - beyond Cat 4 and off the ISGG scale: surfaces or trails a gravel bike realistically can't ride.
• Uncategorized - a gravel-relevant way OSM doesn't tag well enough to classify yet.

Riders then correct and refine that automatic guess. Crowdsourced ratings are blended with the auto-classification using a confidence-weighted average, so a single contrarian rating can't flip a well-tagged segment, but real local knowledge steadily improves the map. You can also add 5-star quality ratings, condition flags (like "muddy when wet"), photos, and comments.

Giving back to OpenStreetMap

Because the data is OSM's, Graveller lets you feed corrections back: leave a public note for a mapper to check, or - if you connect your OpenStreetMap account - suggest a specific tag edit that's submitted under your own OSM identity. Those contributions become part of OpenStreetMap itself.

A note on Strava

Graveller deliberately does not use Strava as a data source. Bulk segment discovery and public display of Strava data both violate Strava's API Agreement, so you won't find any of it here.

Credits

Graveller is built on generous open data and open source:

• Map data: © OpenStreetMap contributors, available under the Open Database License (ODbL).
• Base map tiles: OpenFreeMap and OpenMapTiles.
• Map rendering: MapLibre GL.
• Elevation: Terrarium-encoded terrain tiles (Mapzen / AWS Open Data).

Graveller is a small, independent project. See the Privacy Policy for how your data is handled and the Terms of Service for the ground rules.