The Cheapest Aero Upgrade For Cycling? | GCN Tech Wind Tunnel Tested

What is the best aerodynamic upgrade you can make? What gives you the best bang for your buck? Riding your road bike faster is not just about training. Investment in upgrading your bike and refining your position can also result in huge aerodynamic gains allowing you to ride faster for less effort. But what if you’re on a budget? Ollie and Jon investigated the most cost-effective ways to cheat the wind at Silverstone’s sports engineering hub wind tunnel with the help of Olympian and ex-pro cyclist Rob Hayles.
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What is the cheapest upgrade you've ever made on your road bike?
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[@SeraStaplz]

To this date, still one of the best GCN videos ever made. No intentional product endorsements, no biased opinions, just data with solid methodology. Not to mention, Ollie is my favorite presenter since Matt. Then again, my favorite Top Gear presenter was James May ("Captain Slow"), if that says anything about my preferences.

[@nockee]

Agree. Very good. I was looking for something that compared a full on TT vs an optimized aeroroad bike with clip on position and this was perfect. It makes me not want to spend the cash on a new TT bike.

[@tussk.]

I save about 50 watts by only riding with a tailwind. When I have a headwind, I simply turn around and pedal backwards, meaning that the wind is always behind me.

[@elive4uae]

But mostly we need to get back to the point of starting where we park our car or for example to came back to home.. so I mean that at the first the wind will be in my back but later on I have to face it when u r already exhausted

[@greedfox7842]

what a power move. I'mma try this next time I'm out.

[@ewraticcreations8277]

only if you're a carist, a cyclist can ride tailwinds and use trains headwinds. 1904 TDF athletes did use trains to get there faster, some used cars,it was considered cheating. but no need: start your next tour with Tailwind and go on with tailwind, just go anywhere the wind blows, sleep where you stop and no need for any coming back. to get home just wait until the wind turns and pause in between, in the end you'l be gone far and home again without motor aids and only tailwind

[@Triadii]

I'm weak so any headwind slows me down 10kph

[@thestopper5165]

You've got to be careful though - don't try to do this with one of those Chinese knock-off tailwinds. Make sure your tailwind is from a reputable manufacturer that sponsors a TdF team (or charges $400 for a gear shifter). Personally, I find headwinds much better; there's far less cooling with a tailwind. Cynics say that's because I ride on a Wahoo KickR.

[@cyclenutter2715]

'If you saw someone wearing a tt helmet on a road bike...' '...you'd be in richmond park' that is the most relatable thing I've ever heard. Well said Rob.

[@whatwelearned]

Resident. Can confirm.

[@cyclenutter2715]

Edward Coupe 👌

[@fastasasloth]

4 years of near daily riding around Richmond park, never saw that.......

[@neil_down_south]

@@fastasasloth maybe your TT helmet was obscuring your vision?😂😂😂

[@cyclenutter2715]

Neil Partridge 😅

[@shydncrumph8119]

i'll watch that vid every time i think i need a new bike.

[@climberevan]

Yep--it's a fantastic reality check.

[@lakishaweaks9784]

@@climberevan 7

[@lakishaweaks9784]

@@climberevan 6

[@willjones8925]

Boooooo

[@AgentSmith16]

100% correct. I was thinking of putting money into an aero bike, then watched this video. Got a set of clip on aero bars instead for 59.- and easily boosted my speed at FTHR by 4km/h

[@chrisbligh2970]

The cheapest upgrade I could do would be to stop eating so much freakin food, and stop drinking so much beer. Instant weight savings, more aero. No TT helmet is going to overcome the fact that I have the same body aero profile as a cement lorry.

[@ralph1269]

I like to complain about the cost of latex tubes and aero clothing while I waste about $150/week on booze and terrible junk food.

[@kwitwerikok8o863]

There's always room for beer. That's the best reason to ride. A 1000 calorie ride is good for over 6 beers. Cheers

[@davidkaplan5517]

1 lb off your bike is more beneficial than 1 lb off your body.

[@serakiel8430]

I just plan my route and make it so that the wind is always behind me 😂

[@lauriebarr2623]

Certainly seems like a high cost upgrade!

[@TheGloomStalker]

maybe this video is the one with highest value about aero on internet! Thank you! Good Luck!

[@gcntech]

Thanks for watching!

[@darthjohn0]

As a triathlete this is one of my favorite GCN videos. I always thought my next upgrade would be a tribke, but now I'm considering other, cheaper options.

[@crypto_que]

One day I forced myself to ride in the aero hoods position & it cut time from my normal training ride. It was very hard to stay down for the whole ride, but very worth it, it feels faster & the Strava results spoke for themselves.

[@KurtMueller]

It might have been because you were putting more effort into ride since you already had a specific outcome in mind. What was your speed and power output on that ride? Were you going faster with less power?

[@prathameshdatar3006]

After watching this video, got myself some tribars (good carbon tribars for only USD 40). They are sooo good. Tackling headwind is just so much easier. Yes they took about 2-3 weeks go get used to the intense aero position. Another big advantage is that even on long endurance rides, you can rest your elbows on the bars to help with the fatigue

[@samflint4749]

I used to work in Aerodynamics, and finally a video that sets the record straight! So many people just jump at the chance to buy an 'Aero' bike but expensive bike doesn't always mean big gains. We used to test cycling helmets and shoes, there were some other projects and my biggest surprise was the gains made with different skin suit fabric types. Buy a comfortable bike and get the cheap gains first!

[@davidadamus177]

Now if only we could buy one of those gcn skinsuits!

[@davidadamus177]

@@dsdf_fdp1858 thanks, didn't know that.

[@nockee]

It’s good to see an optimized clip on position is not much slower than a full on a TT bike.

[@MrRay645]

A 20 pound gravel bike with 40c tires is about as roadie as I get, but this types video was pretty amazing... I would have guessed aero bike, aero kit, perfect race position would be the difference between a win and a very close second place... had no idea the power savings would be so huge, really helped me follow using lower speeds.

[@scorch1102]

Ollie's TT position is a thing of beauty

[@MTMKillah]

Is it? I thought it looked super stretched out (arm angle is super wide) but I am just starting to get into TTs soooo

[@oliverbridgewood3929]

@@MTMKillah borrowed the tt bike. from mark threlfall!

[@lyon666]

saddle too high, seesaw pelvis

[@Northernerdownsouth]

I wish you’d test wheels relative to stock wheels vs high quality. The difference is massive

[@The123jonas456]

Great video! It would be nice to see something like this with more entry-level equipment, where the base-level doesn't cost more than the sum of everything that i own :)

[@gcntech]

Good suggestion, whenever we're allowed back out to visit wind tunnels this is definitely something we'd like to test!

[@testtest-ol3yi]

Pick up some used aero bars man, people give them away for next to nothing half of the time and they're insanely fun/fast for how much they cost. Apart from tires/tubes, they're absolutely my favorite upgrade.

[@ricksnyder6318]

It is great to see GCN applying Fournel's theorem: To look good is to already go fast.

[@andrekaf]

Great testing! I wish some other combinations were made: Tri bar vertical + TT helmet Tri bar vertical + TT helmet + Skinsuit These testings would give a more real comparison of the TT bike.

[@Kim_Miller]

12:25 'You are the biggest obstacle'. I've been told that all my life. :)

[@michaelmccormick3160]

Great test, guys! Great work Ollie, no complaints from you (at least on camera) for all that work! Lots of great take aways!

[@antonXPS]

Great guys, thanks for taking the subject on another level 👍

[@geoffwoods7673]

Brilliant stuff guys, loved it.

[@trevorhayes5414]

Interesting stuff guys. Enjoying this hour record series. Rob is awesome. Can we see more of his expertise on the show and maybe more of his stories too? A wealth of info. Cheers.

[@gadenhertog]

Awesome video, informative and fun to watch, thanks!

[@matthysloedolff]

Great informative video. I would particularly like to see some tests on the yaw angles of different section rims (from box to disc wheels) and their watt savings.

[@veggie-mannn]

The best tips so far I watched from GCN, and this one rey works! Thanks!

[@PeerensClement]

Great video guys and great to see the comparisons! We often hear claims about aero gains this and that, but it is good to realize your position on the bike and some inexpensive aero bars can get you most of the way there!

[@PoulHansenDK]

Please, can you publish a table with all your findings, maybe ordered in watts saved?

[@glene77is]

Have just been calculating the Wattage for 16, 19, 21, and these numbers compare favorably with a Power-Meter Bike.

[@chinboy66]

Why, none of these tests can be reproduced in “real world” conditions and this level of testing provides, at best, useful data to convince cyclists to spend money on things they don’t need

[@virtualmartijn]

Dover Ben I think one of the main conclusions is that the two things most people spend lots of money on (aero frames and deep section wheels) are much more expensive per W saved then helmets and clothing.

[@markmergatroid2348]

This really is a fine and educational episode ,easily one of the best for directing your aero gain purchases in the right direction.

[@freewheels7544]

Ollie tryng to beat the hour record is my favorite show by now on.

[@PrzemyslawSliwinski]

That's why expected he would test the stuff at 50km/h.

[@freewheels7544]

@@PrzemyslawSliwinski i'm not sure i understood what you said

[@PrzemyslawSliwinski]

@@freewheels7544 Mr. Ollie is trying to beat the Merckx's hour record (which is about 49km/h). I think the data collected (at least) at 50km/h would have been even more valuable for him - and more illustrative for us as well.

[@freewheels7544]

@@PrzemyslawSliwinski good point

[@ltu42]

@@PrzemyslawSliwinski But kudos to them for doing the tests that are most relevant to us, the general public!

[@carlmullender2941]

Thanks guys, really helpful and informative video.

[@singlespeedchronicles7640]

Absolutely 👍 brilliant ❣️. I love how comprehensive your testing was. Been working on my TT position and aerodynamics, but can't afford the deep section wheels. But, by closing in the vents on my Bolle One helmet, I essentially increased my average speed from 20.2 to 21.3mph (32.5kmph to 34.3kmph) for 20 miles (32km)!!

[@eajohnson]

LOL at the ‘money saved per watt’ thing.

[@MrRay645]

while ridding a $10k bike in the video :)

[@wilfdarr]

Yes, but I don't think this was aimed at people riding 10k bikes! This video was perfect.

[@elive4uae]

This is very informative video.. thanks a lot for all your efforts guys 🙏

[@TheNippleTassle]

Great video guys! Superb content and production quality. The hosts weren't bad either! Keep it coming. Any suggestions for someone (like me) with low hip and lower back flexibility? I rode 186km on Christmas eve and thanks to your video, I've realised that I was working far harder than I needed to!

[@richaw6689]

More great Tech.. nice one lads, damn useful info for next season! 👍🏻

[@MrDazP1adv3ntures]

Loving the tech talk and how you explain things. Fantastic stuff. I'm a cyclist and | live in the Pennines.

[@johnnysherry2804]

That was awesome. Really useful information. Thanks

[@bjmaston]

Outstanding film. Well done.

[@DWMtukwila]

great video, I got to this intuitively through years of riding (as far as position) and now I see my riding form verified.

[@joeotoole484]

Excellent videos guys, thanks.

[@2Calam]

best aero measurement video ive seen. thanks.

[@SuperTaylor68]

Great content chaps,. really interesting

[@salvatoresantoro8616]

This test is very very useful for average rider. Seen a lot of tests like that but this is one of the best I've seen. Great job guys. More of things like that. 😉 👍 Saluti Salvatore 🤓

[@alleywatson]

Loved the Crystal Maze reference

[@ahmaddokmak5500]

Thanks. Great video and very informative

[@judycarlsen7707]

Absolutely the most valuable info I’ve ever seen on GCN! Thank you.

[@chinboy66]

Judy Carlsen give zero useful real world data.....

[@albertogonzalez6296]

Very interesting video. Thanks for the good work. Awesome 👏

[@tvKACAQ]

Very informative video!

[@Mannerzs]

Great video guys, totally blew me away!

[@flyingpig3674]

It was finally a scientific video of yours and I really enjoyed it, though I'm into XC. I think I noticed that in the final setup the tirbars were not in that praying mantis position and it could be interesting to see the difference. I wish you could next time compare it with the full setup, like TT wheels, shoe covers, just everything that can make you more aero etc.. Good job on this one!

[@consalewic7159]

Great video, thank you so much for it. Please consider also to test bottle type and position next time.

[@mikecoglione1308]

Deep section wheels help when you're heading into the wind but the problem is they act like sails with cross winds so if you're riding in an area that tends to be gusty they may end up being more trouble than they are worth. Kudos on unbiased review and above all recommending that the best things in life are FREE.

[@136Hammer]

One of your best videos IMO

[@janwillemkuilenburg7561]

O yes, please test deep section wheels versus standard rims at different yaw angles.

[@vadlme]

they won’t do it because deep section wheels will stop selling 😆

[@yannickokpara4861]

@@vadlme It's in the realm of 10-15 watts at low yaw at 45kmh(read: without sailing effect). Less than a lot of other things, but still significant gains.

[@samuelmundula2216]

Hambini has extensive testing on this - might be worth checking out.

[@albr4]

@@samuelmundula2216 yeah he has the defnitive aero wheel comparison chart, its shame GCN didn't have any proper 60-80mm deep section wheels to compare, you don't get much benefit from 50mm wheels or whatever they used to 25-30mm ones they tested.

[@yannickokpara4861]

@@samuelmundula2216 Yep. I reguarly check Hambini's charts. Just a shame he doesn't have more wheels available for testing. I've got a splendid offer for the new Cadex wheels for what is equivalent to 2000USD, but honestly they're only 26mm outer width with 22.5 inner width for a 65deep and a super slim 23 outer with 19.4inner for a 42 mid depth. Hunt just released their 35 outers optimised for 28s. Would have 23s on the Cadex wheels which would balloon to be very close to the outer width. Cadex wheels obviously lighter and probably more responsive, so yeah… question of how good that rim/tyre interface will be. PS: hold out on buying Cadex Wheels. The RRP is going down down down for 2020.

[@douglasforsyth7302]

Nice video. Thanks guys.

[@normandrobert62]

Well done! I really enjoyed that.

[@dryphos]

I would like to see a comparison in watt savings over different body types, from ultra skinny, average, muscular all the way to chubby, using the same bike and setup. Because all the wind tunnel tests one can find online represent only a small minority of the people watching, I'm safe to say. Keep up the good work!

[@RoninCycling]

I volunteer to be the chubby one.

[@albr4]

well you can expect that the skinny ones will be the most aero with the smallest frontal area and the chubby ones to be the slowest with the largest frontal area. When you talk about tall, short, skinny, muscular, the problem is that the different body types will produce different wattage so it wouldn't make much difference. The taller people will have more drag but they will produce more watts. The smaller people will have less drag but less watts, so they equate to about the same speed. One thing that you can tell is that people with narrow shoulders will be faster, since it won't make any difference for wattage and will definitely make them more aero.

[@dryphos]

@@albr4 Your theory is a good one, but a lot of things can be counterintuitive. Remember the video Ollie did with a fake paunch? It resulted in less drag than just the skinny him

[@albr4]

@@dryphos but how much does the fake paunch weigh? and people don't usually have skinny body and then big belly like that.

[@dryphos]

@@albr4 more of a reason to test it on real people of different body types

[@swites]

That makes sense why my results in road races haven't changed after buying deep section carbon wheels compared with my old alloy box section rims. I do know that I really need to work on my flexibility and position though, as I ride way too upright.

[@perfectlyfitted]

This was great. Thank you

[@Saturday_ProFuel]

More wind tunnel content please!!

[@bendale1732]

Fantastic video! I've been trying so hard to work on my position. Been cycling a few months and am very jealous of all the fancy bikes I see that people have. Glad to see that working on aero positioning can have such a dramatic difference, even on a currently slim budget! Thanks chaps

[@sonosismico]

great video. Thanks

[@konradmarais7726]

I would love to see Ollie testing FLAT ARMS vs PRAYING MANTIS, with: the TT bike, aero lid and skin suit. I am sure he himself is interested in the difference since his extensions are currently flat....as are mine.

[@TheMerckxProject]

I have a lemond washoe steel frame and a carbon DeBernardi Modena. When I put the 58mm deep wheels on the dB, it doesn't seem to have the same straight line benefit that I get from putting those wheels on the steel frame. And it weighs a ton when I do it, no less. Going to have to dedicate some time to tracking my speed and time over the same course using both, and also with my tub wheels, which make the carbon frame ride like a dream.

[@kirkadriankoudroglou4661]

These two have such beautiful chemistry, and physics. 😁

[@greghilliard7641]

I love it. If you look good in the shop window... proper advice 😀

[@marekczarnecki5388]

Much appreciated! Saved me some money !

[@R6ex]

Awesome stuff!

[@danieljentsch3360]

Some data from the drops would be nice.

[@MrAndrewjdavis]

Not as efficient as on the hoods with bend elbows.

[@BenjaminJamesYoung]

kzbin.info/www/bejne/q2SQZmh7bd-CeNU

[@bamsuth9650]

@@MrAndrewjdavis or long af stem and toptube with a tilted saddle and the drops

[@jotapi4010]

lol "_We_ are doing all of these experiments..." - Lets Ollie do all of the riding

[@williamko4751]

To thumbs-up mate. the most informational show ever.

[@evandarling699]

Another excellent video! One thing I'd say about wheels, other than yaw testing, is the gains are literally bolt on. Like the helmet its spend and go for gains. Position is irrelevant to those gains so they feel good. Position is hard to notice as you are putting out the same effort with more distress so it feels like your trying harder. My 2 cents. (or 2 p?)

[@nassozeebo]

I would really like to see a kit comparison. * Full TT, helmet an skin suit * Normal roadie with lycra and somewhat aero helmet * "MTB-kitted". Looser fitting but cycling specific clotes, MTB-helmet * "Casual". Regular shorts, maybe a flannel shirt, or loose fitting wind jacket and so on :) I wanna know if it's worth going lycra for the gravel/bikepacking rides. :)

[@xiejeff4005]

I think this might be the best bike upgrade video I ever saw

[@woolfel]

love this episode!

[@malcolmfarrelle6]

Great video! The deep section rim test is unhelpful not only for the reasons given in the video, the most significant improvement is provided by the shorter spoke length whisking the air when riding. I'm pretty sure Rob used to be just a couple of years younger than me in our old Palmer Park days, but I'm clearly a good 15 years older now.... let's have a video devoted to whatever portrait he keeps in his loft?

[@camiloaranguren9233]

Great video!!! What about aero bike with vertical aero bars?

[@stejayrado]

wish they tested the pramantis posistion on the TT bike

[@phoenixrerising]

FYI: it's called "praying mantis" cause of the way this insect looks.

[@MauricioFragale10]

​@@phoenixrerising that's right. And I think this would be the most critical answer, once there's a lot of people adopting the praying mantis position on their triathlon bikes.

[@MauricioFragale10]

that's right. And I think this would be the most critical answer, once there's a lot of people adopting the praying mantis position on their triathlon bikes.

[@NikoxD93]

Praying mantis with trispoke front, disk rear, aero socks / shoe covers

[@LoscoeLad]

Rob for GCN Tech President

[@andrewince8824]

It's not about individual pieces. Each aero change will have an effect on other aero pieces. Aero-wheels will change how air moves over the crankset and drivechain. Tribars will change your position and therefore change how your helmet affects drag. Aerodynamics are incredibly intricate and changing one aspect will effect others.

[@KenSmith-bv4si]

Hi guys , Ken here . My tarmac has 50mm wheels and that yaw or tacking effect is real . Cross winds can be tricky with 50mm wheels but ,I have felt that sail effect .

[@Jimboblay74]

On my recumbent I'm basically in a permanent TT position - very low frontal area. Good bang for the buck indeed!

[@andrincaviezel1246]

Really cool video... Confirmed the feeling and budget-dominated shopping list of my own... Also sort of diminshes the urge to want to have a time trial bike... :) Although, n+1 is never gonna go away.... Oy wey... :D

[@milanbezstarosti]

Thanks a lot for this videa and information about saving WATT. ITS SOO INTERESTING.

[@davemoss6976]

one of Graeme Obree's early tricks was to turn normal drop bars upside down , fit bmx brake leavers and get into a ski tuck position. The same position he used to break the hour record.

[@malcolmfarrelle6]

Legend of a man. UCI arbitrarily banned the position, and (possibly at the same time?) Introduced the linear dimensional control to set the horizontal position of the saddle when an angular specification would be less inappropriate. They just wanted him to look like everyone else on his bike. I think they requested "daylight between hands and shoulders", he came back pretty well immediately with the superman position. What a man!

[@alexpoupon2606]

A disadvantage of deeper wheels during covid is obtaining long enough stem lengths consistently and will cost more based on demand.

[@williamtipton366]

Just about invested in expensive wheels and tubeless tires….looks like I need to work on my position first! Got the helmet already will look for the TT bars for the flats here in Texas…!

[@lunzje]

Informative video but there was room for so much more... I would be really interested in a sequel... see other comments for plenty of examples of other tests that should have been included in this video.

[@daveylight]

What is the optimal angle for the praying mantis aero bar position? Is there a guideline to use when setting that up? And did you adjust the stack height of the bars to compensate for the delta added by the aero bars? Great video Jon & Ollie!

[@timmclaughlin1787]

Good video, well done Mate. I was going to buy a triathlon bike but now I think I will stick with my road TCR advanced with aero bars and carbon wheels I already have those but will add the aero helmet and stay low more often when riding and racing. Does riding with no shirt on create more drag or less?

[@xGshikamaru]

Love those videos thanks guys for spending time investigating those aero gains

[@kamucho]

Lads this was so good!!!! Just what the Dr ordered

[@darrenconway8117]

I've calculated riding in a vortex induced vacuum reduces drag by 443 Watts. If this is coupled with high intensity differential pressure reduction across the vortex, I gain up to 783W power. So if I only cycle on the edge of the eye of a hurricane, I can go MUCH faster. So fast, in fact, that I might start flying. I want to see that tested in a wind tunnel.

[@jessetamez7362]

Oh so enjoyed that!

[@faezsiddiqi]

Awesome. Bless you

[@stevecarpenter7462]

Great, and very pertinent video. Perhaps should’ve been released BEFORE we wrote those letters to Santa? 😬

[@itarry4]

He takes late updates to your lists these days as long as you email them over. 😏

[@rene2237]

It could be nice to see the difference between classic round bars and more aero handlebars as they are a relatively big part of your frontal area.

[@pedalpowercycling]

Bike radar did this The video says 6-8 watts savings with aero handlebars at 45km/hr. No bar tape = 1.7 watts savings. kzbin.info/www/bejne/qWq0cmSoh72tjJI

[@jamesmedina2062]

@@pedalpowercycling I will save the no-bar-tape for the electric bike of the future. Gotta take care of numero uno 1st!

[@darcyprattwn8632]

I love the wecricket Sticker both great sports

[@09ironman1]

Very good video

[@TheBRad704]

Question for Ollie... did you adjust your saddle or seating style when going the clipons? Or did you just roll forward and deal with the 'extra pressure' for the sake of testing?