I've been getting things wrong

[@tomheenan5806]

I’m one of those who enjoy your videos and don’t comment, sorry. Please don’t stop, please don’t be discouraged by negativity.

[@stevemawer848]

Negativity is great if you're being tested for Covid! 🙂

[@lunddrengabitananrevillam-989]

​@@stevemawer848that's really NEGATIVE + NEGATIVE = POSITIVE

[@stevemawer848]

@@lunddrengabitananrevillam-989 Maths not your strong point, is it? Negative plus negative is more negative. You have to multiply negatives to get a positive.

[@irondistance4313]

Be nice to Alex. The body rocket looks to be cool AF I can’t wait to see it continue to develop also loving the content in retirement, thanks again.

[@thedesigngraphik]

Love the videos, commenting to say love the videos and your details on training and aero, for us mortals its an invaluable resource. Keep these types of videos coming, simply amazing mate. Also many people outside Europe or USA have minimal access to such aero testing methods, so your providing crazy good information and content for a huge part of the world.

[@FrazerWorley]

I love this series, thank you Alex

[@DeveryAndrews]

One of the biggest gains I recently came across was purchasing a Topeak digital air pressure gauge to measure my tire pressures. My hand pump gauge was reading up to 20 psi low. Also waxed my chain, switched to aero skewers (no levers) and Cyckit’s aero saddle bag.

[@veganpotterthevegan]

Digital doesn't mean accurate and they lose calibration over time too

[@MrMarkyone]

Same here with the topeak tyre gauge, my pump gauge was 20 psi out. I also wax my chain,clean and efficient.

[@matthewwhite489]

That’s incredibly interesting stuff. The applications to bike fit, pedalling technique and hydration is probably worth more than anything. Especially over longer distances or when you still have a long run to do after the bike leg. 😎

[@123huskieman]

Really making sure you don’t upset those sponsors at 1:35 😂

[@marcusdyson2604]

I tested out some trigonometry to answer the yaw angle conundrum and this is what I think is correct: Assuming you are riding at the same speed in both directions (one direction has a cross-headwind and the other direction has a cross-tailwind). In this case, the yaw angle is greater when riding in the cross-tailwind. But realistically when you ride with a tailwind, you go faster, to the point at which the airspeed relative to you is the same compared with riding in a headwind. So the two cancel out and the yaw angle works out exactly the same. The only remaining difference when riding with a tailwind is the proportion of other forms of resistance, such as tyre resistance and drivetrain efficiency. So if you factor this in, your speed relative to the wind would be slightly slower when riding in a tailwind, which means the cross-tail wind would result in a slightly increased yaw angle.

[@AlexDowsettOfficial]

This is the conclusion I came to, just put much better 😂

[@jfitchew]

This was considering the situation where the headwind speed was the same strength in both directions so you are absolutley right that the yaw angle would be the same. The other resistive factors that increase with bike speed just mean that you need to apply more power to overcome those, they obvioulsy don't affect yaw angle if you are maintaining that same headwind speed.

[@scottmarriott1185]

Great to see real life TT cycling being analysed with data….always loved the phrase…’in god we trust…everyone else bring the data’….

[@Butters2079]

I assume a beer belly has the same effect as an aero bladder?

[@stevemawer848]

I think the bladder sits higher than the belly, so you'd really need to grow breasts. So women have an aero advantage over men?

[@bitchoflivingblah]

Real world experience of someone I passed on a bike ride who when we stopped at the traffic lights had a bit of a pot belly - thought this isn't going to be problem keeping ahead, but the guy was grease-fricking lightening, helped he was on a Giant Propel and had deep rim carbon wheels, even so, 40kph for 10 kilometres was still going some into a slight headwind. I was so glad when he had to turn off, so I could finally relax. But for some reason I was convinced his pot belly gave him a slight aero advantage, the pear shape has to be better for channeling the air around the rider and bike.

[@jonnyt8154]

I am free Billericay and this is one of my old usual rides, I have been down that straight in both directions so many times. Gustav’s bike nice 👍

[@RochsWorld]

Hi Alex, love the vids. How big does the chest faring need to be to be beneficial? Would a pool noodle be big enough? Thanks

[@CesarFalco]

i could very well be wrong 11:18 but i think the angle is smaller at higher speed because if you think of the speeds as a triangle, the long side is your speed, the side at a right angle to that is the 'amount of side wind', and then the angle between the hypotenuse and the long 'your speed' line is the yaw angle. so as you increase your speed, since the crosswind doesnt increase, that means your hypotenuse will get longer and angle will be shorter. Basically because you're only increasing one side of the triangle so it forces the angle to go down... i think lol

[@jfitchew]

Your trigonometry is correct but the qualification that is needed here is the "long speed", as you referred to it, is the headwind speed not the bike speed! So you can be travelling a lot faster with a tailwind and the yaw angle will be the same as a slower bike speed into the opposite angle of wind (i.e. same amount of side wind).

[@CesarFalco]

@@jfitchew yes, exactly!

[@cbyod]

4:10 What do you call the extension garmin mount thing? And were can you get one?

[@herrangsbiodling9778]

Interesting videos Alex. Keep doing your thing.

[@benclubb878]

Airspeed over the rider is lower when in a tailwind, as it's (bike speed-windspeed) vs (bike speed+windspeed), so the cross-wind effect is more impactful on the yaw during a tailwind. Bit like a wind sock that changes direction a lot in low wind vs pretty consistent in high winds

[@IverKnackerov]

Great vid …really useful insights 👍

[@MaggieCat83]

That downwind yaw angle reduces due to apparent wind angle. As you go faster downwind the angle changes until it’s a 4 degree headwind. Sailing stuff.

[@stevemiell4555]

Absolutely fascinating vid, nice one 👍

[@veganpotterthevegan]

Biggest reason disc brake bikes are faster(beyond the wheels) is that the UCI changed their rules on tube shapes and nobody is going to design a modern rim brake TT bike to those new limitations. The Cervelo P5 is still faster than a lot of new bikes though. But they're the exception to the rule. The replacement to the P5 disc is going to be absurdly fast as the present bike is still close to the fastest on the market and not built to those newer tube restrictions.

[@ksbbkr]

Videos are good. Your insights in training etc are interesting

[@bodyrocket6844]

Another great testing session Alex, thanks for joining us. Looking forward to making you even more aero in 'retirement' 😏

[@nigelgittins]

Good stuff. Keep them coming please kind sir🎉

[@Second247]

Well this was a great and interesting video. Man i'm glad that i race in Zwift, i barely need to think about the draft.

[@bodyrocket6844]

Smart! 😉

[@balazs_korcsog]

Def try the Q rings! Especially if you can get your hands on the more oval QXL ones! They dont make them anymore but the 16% ovailty is a beast! (Ofc when you set your ocp just right 👌)

[@messi9991]

The design on the disc wheel is rad.

[@wattswheelhouse]

I don't want to be a live data nerd when I'm on my bike. But I am. And I really want this data!

[@barmouthbridge8772]

Every day is a learning day. Look how long it took to get the mentality away from 23mm tyres on normal roads. And everyone used to ride 53/39 chain sets with small cassettes. Embedded ignorance is the hardest to exorcise to exercise.

[@DeveryAndrews]

I run a 23mm Conti on the front of my Roval CLX 60 Rapide road bike because appears to fit the rim better aero-wise from the front than say a 25mm. It’s also a bit lighter and works great for me. I do run a 25mm on the back.

[@kevinpeterman7127]

Well, I used to ride 52/42 chainset. (That just means I'm probably older than you.) 😂

[@stevemawer848]

@@kevinpeterman7127 I used to ride a 54/44 (with a 6-speed block!) - does that make me even older?

[@kevinpeterman7127]

@@stevemawer848 Nope. I had a 5 speed block.

[@johno4284]

Are those D2Z extensions an updated version?

[@dsmhiggins67]

How much does a shave save ?

[@CesarFalco]

6w according to gcn

[@bodyrocket6844]

That's something we can test!

[@GordonMcMullan]

Not testing one of those 'balaclavas'?

[@Wayfarer-Sailing]

Downwind your ground speed will be higher (for any given airspeed) than upwind, so perhaps your riding style will in some way produce a more consistent yaw angle? (Gyroscopic stability, cadence-related resonance etc).

[@FNQ_BEES]

Im another non-liker, non-commenter. Mostly because, while i enjoy the content, i don’t feel i can add anything either humorous enough or that would be of any value to you. But i assure you, yours and Shane Millers video’s are the ones i enjoy the most, especially since Francis’s Cade Media rebranding. So please ignore the haters ;)

[@peterm.7497]

There is so much to be pessimistic about; I generally refuse to be negative about a hobby (bicycling) that I pursue for fun and improved health. That said, calling the bums out and fighting back would "get people talking" and improve your income -- disagreements are good for clicks.

[@twowheelutopia]

Top videos 👍

[@andyfairchild2383]

Given I ride a Brompton, this is all pretty irrelevant to me. But it’s fascinating stuff so keep ‘em coming Alex and thanks.

[@bodyrocket6844]

Depends how aero you want to get on your Brompton ...! Commute PB incoming

[@Star14trek]

Alex grear vid .... question do you think you have a line as an amateur rider (LOL) that you wouldnt cross from a visual prospective for a couple secinds/watts? i.e. the only time TT I do us at Tri's as age grouper but i could wear that POC mario brothers mushroom hat !😵‍💫no mater how many seconds it saves .... may be its just vanity?

[@davet9655]

Love hate relationship with that stretch of road!

[@alansheard553]

I love science, trouble is, i don't understand it. Great video though Alex.

[@marcusingram522]

Interesting thanks

[@aarondcmedia9585]

Air speed is all about vectors. Increase your ground speed and the vector in your direction is increased. Eventually it wipes out the side wind vector.

[@jfitchew]

The wind is also a vector, it has head/tail-wind component as well as that side-wind component. So when you switch directions the sidewind component remains the same but the headwind component reverses, meaning you will have completely different bike speeds for the same yaw angle.

[@jonathanzappala]

The temperature of the aero bladder is a hot debate on slowtwitch 😂by people who say it doesn't cool your core temp

[@bleigh6562]

Great video so tech.... Thanks 🎉 No bad comment 😮

[@larrylem3582]

The question on trig was not clear. What is being asked?

[@bobduffy8792]

I liked this video.

[@ls1125]

If.the bladder was faster than no bladder, then by that logic, myself being a fat biffer with a belly means that i am technically more aero than my skinny mates, right? In that case...i will have another slice of cake! 😂😂

[@frederikconradsen3786]

👌🏼

[@archieatkinson2063]

AeRo iS a MyTh

[@GeneFowler-u1n]

The Cervelo P4 EVO is faster!

[@GazRadCycling]

Who doesn’t like these videos!!

[@stevemawer848]

Masochists. Else why would they watch them? 🙂

[@dundeedideley1773]

Please give the camera to someone else I'm getting seasick