This is the big miss in these tests. Also, that 10% difference becomes 30 minutes over the course of a 5 hour ride.
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Casing weight and construction I think affects the ābreakpoint pressureā that is the pressure at which hysteresis increases the rolling resistance rather than reduces it.
āimpedanceā
Josh Portner has written about it here:
Youāre also right in that heās happily ignoring aerodynamics which plays a role at anything above 15mph. Iāve seen folks in the cycling media say that aero plays a larger role than rolling resistance at 18mph. Iām not going to do the math at the moment, but that reflects my anecdotal experience.
Thereās a flat gravel ride that I do with some friends in which Iām usually pulling the whole way coz theyāre waifish and Iām a bit of a rouleur by comparison. Iām typically on 38mm tires with side knobs and feel like my CAAD10 with deep wheels and 30mm Strada Pros would work just fine on that course for a couple more mph, but likely Iād end up dropping everyone.
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IDK WTH is happening with my order from bike24. Never had an issue with them before. Order Jan 11th and tracking hasnāt updated since the 13th.
Either way, shop has some wtb resolutes in stock. I supposed these will do.
I ordered a couple of chainrings from them recently and the last update was a ready to dispatch email on 1/19, nothing since then. Smaller items took seemingly forever to ship earlier in the pandemic. Maybe thatās still an issue?
I received stuff in 9 days the last time I ordered in August?
No idea about Nude Beach, but mail has been really slow since the beginning of December here.
edit: actually, the closet from DE did take extra long.
more anecdata: an order i made from Bike24 on Jan 7th was in DHLās hands on Jan 10th and and in my hands on Jan 18th.
Iāve ordered two things from Bike24 in the past year or so. Both things never shipped and were eventually canceled and refunded.
DHL is kinda the gold standard IME. Does Bike24 ship everything with them?
Overall aero is certainly far more important than rr. But breaking just tires out of that probably means an aero penalty that is going to be smaller between sizes than casing/rubber factors unless weāre comparing the same tire in multiple sizes. Outside of RH thereās not a huge amount of tires with the same construction that are available across a really wide range is sizes anyway.
But yeahā¦ if you want to go fast, worry about getting as aero as feasible then get the fastest tires appropriate for the course. If youāre just tootinā you can make an argument for the same approach.
Thatās the part that gets lost on lots of people I think. Gains in efficiency are gains for every rider. Why not expend less energy over the same distance? Why not go further with the same effort? Both seem like no-brainers to me.
But as we know, we all like to suffer on the bike in different ways. Life is suffering after all.
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aero gains are temporary, suffering is eternal
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Bike24 ships near-exclusively via DHL because, yāknow, Germany.
at least in my area, theyāre my least favorite carrier. coinflip on if theyāre actually going to deliver to my apartment, or my next door neighbor, or the correct house number but two streets overā¦
itās amazing because theyāre the people that can deliver to the places in the world without addresses
Like the UK.
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Itās true, but āgoing fastā is relative. The thing about aero is that at the point it becomes meaningful, aerodynamic drag increases geometrically whereas rolling resistance remains proportional to speed.
So, nobody really wants to tool around on turds at 13-15mph. Surface conditions will likely dictate what kind of tire folks want to use up to 18mph and much above that, aero considerations are going to drive the need to run the most aero tire possible.
So, for someone like myself where Iām poking around at 20mph and sustaining ~200W aero is a bit of a concern. A pro similarly cruising at 75% of FTP doing around 300W will be going 25mph, a speed at which aero drag becomes way, way more important. Thatās just for training ride type activities. Peloton speeds tend to be way higher than that.
Even your shadow got a flat.
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I think there has been arguments even for really slow people to benefit from aero, because they are out there for so long. I know in bikepacking, speeds are slow, but there is no way I am having my tent slung sideways under my bars like some people do.
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It doesnāt take much of a gust or headwind to make aero become Very Important for even slow folks.
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Iām skeptical that anything on your bars in front of your body does much against aero since the whole cross section of your body is behind it.