For 2023 we have once again modeled all 21 stages of the Tour using our advanced performance modeling software. Discover our new Category Climb Detection feature and utilize our Time Analysis tools to scrutinize every stage just like the pros. With these tools, identify where modifications in power, drag, weight, and rolling resistance can deliver the most significant impact on riders' performance.
This year's race kicks off in Bilbao, Spain before heading into the Pyrenees for some early fireworks, then winds through the Massif Central and finishes with a brutal Alpine block featuring stages to the Puy de Dôme, Courchevel, and Saint-Gervais Mont-Blanc. The climb detection tool really earns its keep here — with hors catégorie and Category 1 climbs scattered throughout, knowing the exact gradient demands and optimal power targets for each ascent can be the difference between a strong finish and a blown-up race. Use the Time Analysis tool on any stage to see how small changes in your CdA or weight translate to real time savings over a 4+ hour mountain stage.
| Stage |
Type |
Date |
Avg. Watts |
Avg. Speed |
Time |
|
| Stage 1 (Bilbao to Bilbao) |
Hilly |
07/01/2023 |
335 w |
40 km/h |
04:32:01 |
|
| Stage 2 (Vitoria-Gasteiz to Saint-Sébastien) |
Hilly |
07/02/2023 |
336 w |
41 km/h |
05:05:32 |
|
| Stage 3 (Amorebieta-Etxano to Bayonne) |
Flat |
07/03/2023 |
341 w |
42 km/h |
04:30:47 |
|
| Stage 4 (Dax to Nogaro) |
Flat |
07/04/2023 |
346 w |
45 km/h |
04:02:27 |
|
| Stage 5 (Pau to Laruns) |
Mountain |
07/05/2023 |
356 w |
39 km/h |
04:09:03 |
|
| Stage 6 (Tarbes to Cauterets-Cambasque) |
Mountain |
07/06/2023 |
356 w |
37 km/h |
03:57:07 |
|
| Stage 7 (Mont-de-Marsan to Bordeaux) |
Flat |
07/07/2023 |
342 w |
46 km/h |
03:41:26 |
|
| Stage 8 (Libourne to Limoges) |
Hilly |
07/08/2023 |
343 w |
44 km/h |
04:36:11 |
|
| Stage 9 (Saint-Léonard-de-Noblat to Puy de Dôme) |
Mountain |
07/09/2023 |
363 w |
41 km/h |
04:27:35 |
|
| Stage 10 (Vulcania to Issoire) |
Hilly |
07/11/2023 |
333 w |
42 km/h |
04:01:40 |
|
| Stage 11 (Clermont-Ferrand to Moulins) |
Flat |
07/12/2023 |
344 w |
42 km/h |
04:14:38 |
|
| Stage 12 (Roanne to Belleville-en-Beaujolais) |
Hilly |
07/13/2023 |
334 w |
40 km/h |
04:12:35 |
|
| Stage 13 (Châtillon-sur-Chalaronne to Grand Colombier) |
Mountain |
07/14/2023 |
353 w |
40 km/h |
03:29:10 |
|
| Stage 14 (Annemasse to Morzine Les Portes du Soleil) |
Mountain |
07/15/2023 |
330 w |
35 km/h |
04:17:52 |
|
| Stage 15 (Les Gets les portes du soleil to Saint-Gervais Mont-Blanc) |
Mountain |
07/16/2023 |
333 w |
37 km/h |
04:49:00 |
|
| Stage 16 (Passy to Combloux) |
Flat |
07/18/2023 |
431 w |
39 km/h |
00:33:53 |
|
| Stage 17 (Saint-Gervais Mont-Blanc to Courchevel) |
Mountain |
07/19/2023 |
334 w |
36 km/h |
04:38:53 |
|
| Stage 18 (Moûtiers to Bourg-en-Bresse) |
Hilly |
07/20/2023 |
348 w |
43 km/h |
04:19:51 |
|
| Stage 19 (Moirans-en-Montagne to Poligny) |
Flat |
07/21/2023 |
384 w |
46 km/h |
03:46:24 |
|
| Stage 20 (Belfort to Le Markstein Fellering) |
Mountain |
07/22/2023 |
331 w |
35 km/h |
03:45:28 |
|
| Stage 21 (Saint-Quentin-en-Yvelines to Paris Champs-Élysées) |
Flat |
07/23/2023 |
347 w |
44 km/h |
02:34:31 |
|
How Best Bike Split Models the Tour de France
Best Bike Split's Tour de France stage analysis is built on the same physics-based power modeling used by athletes and coaches to plan real-world races. Each stage is modeled using route elevation data, distance, aerodynamic and rolling resistance assumptions, the same inputs that drive a Best Bike Split race plan. As race day approaches, models are rerun to pull in live weather data layers in wind speed, wind direction, temperature, and precipitation risk so the model reflects the most accurate weather predictions. The result is stage analysis grounded in watts, not just narrative, giving cyclists a more meaningful way to understand what each day of the Tour actually demands. Whether you're following the GC battle, chasing a breakaway stage, or just trying to understand why a 127 km stage to Alpe d'Huez can be harder than it looks on paper, Best Bike Split's stage modeling gives you the numbers behind the race. Create a free account to access all 21 stage workouts, scaled to your FTP and ready to load into Zwift or your training app of choice.
More from our Tour de France Series
2026 Tour de France Stage Analysis
2025 Tour de France Stage Analysis
BBS vs Tour de France - How Accurate Were We?
2024 Tour de France Stage Analysis
2023 Tour de France Stage Analysis
2022 Tour de France Stage Analysis
2019 Tour de France Stage Analysis
2018 Tour de France Stage Analysis
2017 Tour de France Stage Analysis
2016 Tour de France Stage Analysis
2013 Tour de France Time Trial Prediction
