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B Xavier Disley, PhD Profile picture
B Xavier Disley, PhD
@xavierdisley
Performance analysis consultant, owner @AeroCoach. Loves a graph 😀 📊. UCI Masters World Pursuit Champion 🌈. Spinal injury in 2022, now have a dodgy left leg.
Jul 17, 2023 • 20 tweets • 4 min read
It's the big one tomorrow for this year's @LeTour - Stage 16 time trial!

With the GC top spot of Jonas Vingegaard within 10sec of @TamauPogi, small differences in the 22.4km largely uphill test will add up!

Read below for my thoughts on what to expect 👇

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#TDFF2023 The stage darts around Passy and finishes in Combloux.

It is 22.4km in length, with a tough short climb at the beginning (it's an uphill drag off the line before you even get there), and then the long >6km climb to finish at the picturesque centre of Combloux.

2/20 Image
Apr 14, 2021 • 12 tweets • 5 min read
A real world aero test of UCI illegal and legal road bike aero positions (thread!👇) - is forearm riding faster? 🧐

In order to explore the general effects of riding in different positions we headed off to an outdoor velodrome for some aero testing.

1/12 Our test rider was Richard Bussell, multi national TT champion at 76kg/183cm. We tested a variety of different hand positions - below is the data we collected for Richard with W differences quoted at 45kph. At lower speeds these differences will decrease.

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Sep 29, 2020 • 14 tweets • 4 min read
How much will the TTs at the @giroditalia influence the overall result in the final standings? A thread firstly exploring the details of the stage 1 15.1km TT on Saturday. The three time trials, totalling nearly 65km over the three week race, occur on Stages 1, 14 & 21 👇

1/14 Stage 1 should be filed under "exciting", as it is largely downhill after a short steep climb straight out of the start gate. Riders start in Montreale and head east, finishing in Palermo 15.1km later.

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Sep 25, 2020 • 6 tweets • 2 min read
So it's the elite mens @UCI_cycling TT at #Imola2020 today, over the same 31.7km course that the women rode yesterday, meaning it'll be the shortest (in terms of finishing times) mens World TT champs since it began in 1994.

Thread 1/6 Image Lots of riders are in the mix for the medals, with of course Rohan Dennis as the defending champion from 2018-2019 & looking to complete the hat trick. Unlike a normal year some riders are just days away from completing the Tour de France, others days from starting the Giro

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Sep 21, 2020 • 7 tweets • 2 min read
The #TDF2020 is over and @TamauPogi has won the maillot jaune. During Stage 20's TT to la Planche des Belles Filles, if we break down the performance of the top players at the time checks how did their individual rides play out?

Thread 1/7 Image Primož Roglič's performance on the flat kept within 10-15w (in terms of performance, assuming identical riders) to both Pogačar and Dumoulin (a former world TT champion), as well as riding faster than Porte and Van Aert.

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Sep 15, 2020 • 9 tweets • 3 min read
Looking ahead to the final @LeTour on Stage 20 and it’s going to be decisive. Time gaps by the time we get there will be close & because of the unique nature of the profile there are a few different aspects that will affect the outcome of the TT.

(Thread) 1/9 Firstly let’s break down the course itself. Starting in Lure and finishing up La Planche des Belles Filles. Three main sections – 1st a flat non technical section to Le Raddon, 2nd a gentle gradient to Col de la Chevestraye before a descent, then 3rd the climb to LPdBF.

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