Motorcycle and car loop from Saint-Nazaire
From Saint-Nazaire (Pays de la Loire) we calculate the twistiest round trip in three lengths, for motorcycle and car. It runs over paved country roads without motorways. Every figure comes from the calculated route.
The app calculates a loop from your location with the same method.
Reverse: the same route backwards. Curves swap sides, the radii stay.
- Kilometres
- 67.0km
- Curves
- 124
- Climbing
- 152m
- Median radius
- 82m
- Curves per 100 km
- 62.7
Tap a dot on the map for its radius and road.
Radius explorer
Move the cursor over a bar. The curves of that class light up on the map, with their km position.
Tightest radius per curve
83 curves sit at junctions and are left out of these figures, for example turns with a small radius.
Curve character
Of 67.0 km, 16.5 km run through curves. The rest is straight or a junction turn.
- Tight
- 0.4 km, 0.6 %
- radius under 60 m
- Medium
- 6.1 km, 9.2 %
- 60 to 180 m
- Wide
- 10.0 km, 15.1 %
- 180 to 400 m
- Straights and junctions
- 49.9 km, 75.1 %
Key figures of the route
- Tightest curve
- At km 6.9: radius 35 m, right.
- Longest curve passage
- 5 curves over 1.6 km, from km 62.3 on Route de Reton.
- Densest curve stretch
- 16 curves over 10 km, from km 31.5. The quieter kilometres come before.
- Longest climb
- 10.2 km with 54 m of ascent, from km 13.5 on D 247. Average gradient 0.5 %.
Elevation profile
From 0 m to 56 m. 152 m up, 153 m down.
Drag a finger or the cursor along the profile. The map shows the spot.
Turning points
- High km 23.6: 56 m
- Low km 39.9: 1 m
- High km 54.6: 36 m
Compared with the standard loop
The reference is the fastest round trip with the same start, heading and circle radius.
| Compared with the standard loop | Twisty loop | Standard loop |
|---|---|---|
| Kilometres | 67.0 | 83.0 |
| Curves | 43 | 18 |
| Curves per 100 km | 64.2 | 21.7 |
| Motorway | 0.0 km | 0.0 km |
3.0 times as many curves per 100 km as the standard loop.
Among the cities
Rank 68 of 75 cities in France. Median 134.9 curves per 100 km, Saint-Nazaire sits at 48.0.
Similar cities
All lengths from Saint-Nazaire
Every length in both directions. The curve column shows the count away from junctions first, then the total.
| Length | Direction | Kilometres | Curves | Curves per 100 km | Median radius | Climbing |
|---|---|---|---|---|---|---|
| 60 km | Outbound | 67.0 km | 43 / 126 | 64.2 | 89 m | 148 m |
| 60 km | Reverse | 67.0 km | 42 / 124 | 62.7 | 82 m | 152 m |
| 120 km | Outbound | 130.3 km | 58 / 156 | 44.5 | 96 m | 298 m |
| 120 km | Reverse | 130.3 km | 60 / 166 | 46.0 | 96 m | 324 m |
| 200 km | Outbound | 194.7 km | 69 / 212 | 35.4 | 89 m | 481 m |
| 200 km | Reverse | 194.7 km | 70 / 205 | 36.0 | 89 m | 501 m |
Every curve with its position
43 curves away from junctions, with km position, tightest radius and road.
| km | Radius | Road |
|---|---|---|
| 3.1 | 149 m | Route de Reton |
| 3.4 | 74 m | Route de Reton |
| 3.8 | 113 m | Route de Reton |
| 4.1 | 90 m | Route de Reton |
| 4.4 | 127 m | Route de la Chaponnerie |
| 8.4 | 185 m | Route de Guérande |
| 10.3 | 144 m | Route de Guérande |
| 13.5 | 93 m | Avenue Guy de La Morandais |
| 13.8 | 76 m | Avenue Guy de La Morandais |
| 16.9 | 81 m | Place de la Victoire |
| 19.3 | 57 m | Rue du Maréchal Foch |
| 21.4 | 82 m | Boulevard des Maures |
| 25.5 | 89 m | D 45 |
| 25.6 | 102 m | D 45 |
| 28.0 | 102 m | D 92 |
| 28.4 | 62 m | Route des Marais |
| 28.5 | 59 m | Route des Marais |
| 28.6 | 59 m | Route des Marais |
| 28.7 | 65 m | Route des Marais |
| 29.2 | 72 m | Route des Marais |
| 29.4 | 65 m | Route des Marais |
| 29.9 | 73 m | Route des Marais |
| 29.9 | 43 m | Route des Marais |
| 30.0 | 43 m | Route des Marais |
| 30.3 | 133 m | Route des Marais |
| 30.6 | 89 m | Route des Marais |
| 31.5 | 123 m | Route des Marais |
| 32.8 | 138 m | Route des Paludiers |
| 34.1 | 43 m | Chemin de Kersalio |
| 34.2 | 62 m | Chemin de Kersalio |
| 34.2 | 92 m | Chemin de Kersalio |
| 35.0 | 139 m | Route des Paludiers |
| 38.4 | 117 m | D 252 |
| 45.6 | 161 m | D 247 |
| 50.1 | 139 m | Route du Chatelier |
| 53.5 | 91 m | |
| 53.7 | 128 m | |
| 54.3 | 90 m | |
| 58.1 | 69 m | Route de la Lande d'Ust |
| 58.5 | 84 m | Route de la Lande d'Ust |
| 59.1 | 84 m | Route de la Lande d'Ust |
| 59.9 | 35 m | Route de l'Angle |
| 61.9 | 84 m | Route des Carrois de Cuneïx |
How it was measured
- Route: a round trip from Saint-Nazaire, calculated on road data from 3 Jul 2026. Of several possible loops of the same length we show the one with the most rideable curves. Motorways are excluded.
- Vehicle: The route is calculated for a motorcycle and runs on paved roads. A car can drive it too. On narrow stretches a car route can differ in detail.
- Curve: a turn in one direction of at least 35 degrees. The DriveBattle app counts the same way.
- Radius: the tightest curve radius inside the curve. Turns at junctions are flagged and do not count towards radius, tightest curve or passage.
- Elevation: ground height along the route, smoothed over about 450 m. A climb counts from a 5 m height difference.
- Calculated on 5 Oct 2026. The figures describe this route. The state of the road on the day you ride can differ.
Calculated on 5 Oct 2026
Questions about the round trip
How long is the round trip from Saint-Nazaire?
There are three lengths: 60, 120, 200 km. The calculated routes measure 67.0, 130.3, 194.7 km.
Can I drive the round trip by car?
Yes. The route runs over paved country roads without motorways and can be driven by car and motorcycle. It is calculated for a motorcycle, so on very narrow stretches a car route can differ in detail.
How many curves does the round trip from Saint-Nazaire have?
On 120 km we count 156 curves, 58 of them away from junctions. That is 44.5 free curves per 100 km.
How tight is the tightest curve?
On 120 km the tightest radius is 38 m, at km 35.8. The median radius of all curves is 96 m.
How much climbing does the route have?
On 120 km it is 298 m of ascent. The highest point is 66 m, the lowest 2 m.
Can I ride this round trip with the app?
Yes. The round-trip generator in the DriveBattle app calculates loops from your location with the same method.
The round-trip generator is part of Premium. During the beta it is open to everyone.