This thread is a fascinating read! And great work with the index. It's an interesting framework for discussion indeed.
One of my theories about body proportions: I think the lanky climber type (tall and thin like Wout Poels and Sepp Kuss) is much better on steep gradients due to leverage and worse on shallow gradients due to bad aerodynamics. The opposite could be true for Evenepoel (at least when he is not at his climbing weight).
An example supporting this theory on the other end of the scale is how Rujano always seemed at his best on shallow climbs.
I don't know how many obscure-ish results you have covered, but do you happen to have the numbers and/or any fun facts about some of these legendary climbs:
Ivailo Gabrovski, Elmali 2012
Gonzalo Najar, Alto de Colorado 2018
Jens Voigt, Rettenbachferner 2007
Alexander Foliforov, Alpe di Suisi 2016
Pablo Torres, Finestre 2024
Mark Padun, La Plagne 2021
Andres Camilo Ardila, Passo Maniva 2019
Riccardo Ricco, Aspin 2008
Iban Mayo, Ventoux 2004
And even with all the best adjustments in the world, I still think the 2010s were relatively weak (especially the early 2010s were horrible in terms of general level, only 5-6 riders could perform at least decently). Even the top guys in the 1950s!! and 80s probably had a comparable peak level.
You might be touching on it in your upcoming best performances per year list, but I wonder what your index shows regarding changes in general performance in the years ~2005-2013. The general idea as far as I can tell is that performances dropped quite sharply around the introduction of the ABP and then a certain team said 'screw this' around 2011. I don't wanna ignite a clinic discussion as this has been discussed to death already, but maybe that storyline isn't as apparent in the numbers, so I'm curious. 2009 seemed quite nuclear as you have mentioned.
And something you also might touch on which I'm also curious about, is how Bahamontes compares to more modern riders. IIRC his Puy de Dome climb has occasionally been touted as a candidate for greatest climbing performance of all time, all things taken into consideration.
And a few random questions which you can chose to answer or ignore depending on whether there's anything interesting to say:
- How does Lipowitz' performances stack up against his second-tier rivals like Ayuso, Hindley and especially Almeida? Are his 2025 Tour numbers indicative of podium chances against f.ex. Evenepoel and Almeida?
- How good was peak Rujano? I reckon his index was way higher in 2005 than in 2011.
- Is there anything in the 2017 data (or general late-career Valverde) which lends credence to my hunch that Valverde could have dealt with Froome in the 2017 Tour with his great form that year?
- Was Geoghegan Hart as elite in the 2020 Giro as I think he was? Or had Hindley not yet reached peak numbers?
- If you keep track of any U23 races, how does the level there generally compare to the WT apart from outliers like Torres (presumably)? Or is the sample size too small to say anything?
- Which Mur de Huy ascent has the best index number?
- How good was the Klöden/Landis Alpe d'Huez? Was it the best Klöden, or was he perhaps better in 2004? And can we infer anything about Ullrich's form that year, if you have the Albulapass numbers from Tour de Suisse? That Tour is such a huge what if.