I found this list useful as a £/W guide:
Some quite surprising entries on that list, I thought.
I found this list useful as a £/W guide:
Some quite surprising entries on that list, I thought.
I asked Chris Yu another question on strava; what’s the aero pentaly if water bottles and cages.
Bottles + cages = 5 watts
Cages alone (no bottles) = 2.5 watts
So take off the cages if you don’t need them.
I added in the post above.
Tires! Rolling resistance can be substantial depending on the brand. 10-30w for two tires depending on how slow your current setup is.
Likely, we should start a new thread that is “Optimization” and compile the aero and other equipment/setup options into one master resource for quick reference.
The post above (and a few others) are good starting points for the info.
At this rate I’ll be cruising along at 20mph without pedaling.
Those numbers are all normalized to 40kph, so ~370W of output.
I get that. Since the drag force is proportional to the square of velocity those numbers just look exaggerated. You’d figure for most people cruising along at 18-20mph those savings will be probably 50% of what is shown. Even that seems a little crazy
370 watts for 25 mph? We talking riding completely upright on a round tube bike on crappy pavement?
yeah, so 370 doing absolutely nothing to try and get out of the wind, but still ideal rolling resistance, so then with the aero savings, you can go about 40k/hr @ 300 watts (or lower)
Last year’s A race for me was just that: 39.5km/h @285w. And I was maybe 50% aero. It can be done!
Merckx style on a road bike? I am doing a road tri this year on a non-tt bike… BBS is saying that my target power of 275 watts will be 22 mph, but it is rolling terrain, not totally flat
Merckx class I’m roughly 21.5mph at 275W on a flat course with 3 small rollers, but not very aero on a Trek Domane. I’ve seen smaller guys on bikes with better geometry do Merckx class at 23-24mph at roughly the same power on the same 10 mile course (leaderboard doesn’t tell you if they rolled Merckx or full TT).
The club Google spreadsheet for TT series doesn’t have power, but does split between Merckx and TT Nerd. The fastest guy is a duathlon international age group champion (40 something), and his fastest was 29.3mph @ 371W ave power. The “smaller guy” mentioned above did 24mph @ 284W last June in a 12mph crosswind.
At this rate I’ll be cruising along at 20mph without pedaling.
If I’m not mistaken you don’t sum the wattage savings from multiple improvements.
If someone smarter than me can explain this I’d be grateful…it’s an important point that needs to be understood by the consumer (all of us) but, I do not have the math/physics background to explain coherently.
Merckx style on a road bike?
Road w/ clip-ons.
But a guy who did go Merckx did 340w and beat me by 1:11.
I can only compare my RR and competitor’s TT bike on the same 21km course (all times relative to mine). But, as you will see…there’s way more to it than that. 285w on RR w/ clip-ons = me. 285w with deep dish wheels and aero helmet = 2:20min faster. 300w with semi-aero everything = 2:56min slower. 330w with TT bike, full aero, disk wheel, etc = 11s faster. 340w on a RR with no aero anything except skinsuit = 1:11min faster. It’s all over the shop. Don’t think just because you …
If I do all these I’ll save 100 watts. Jeez. That means I should be able to ride Leadville in about 7 hours
But a guy who did go Merckx did 340w and beat me by 1:11.
shit happens, here is a result from one of our 2018 TTs where the fast Merckx class dude (no skin suit, no disc wheels, no deep aero wheels, no aero bars, no teardrop helmet) edged out a TT guy at roughly same power:
Time | Power | Speed (mph) | TT | Merckx |
---|---|---|---|---|
0:20:51 | 375 | 28.78 | 1 | |
0:23:41 | 25.34 | 2 | ||
0:23:58 | 25.04 | 3 | ||
0:24:58 | 284 | 24.03 | 1 | |
0:24:59 | 268 | 24.01 | 4 | |
0:25:13 | 23.80 | 5 | ||
0:27:03 | 22.18 | 6 | ||
0:30:00 | 19.99 | 2 |
TBH I wish I had gone skinsuit, aero helmet, and a slightly faster tire than the Mezcals. With the headwind on the way back from Twin Lakes, I feel like that would have saved a lot of energy.