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May
17
comment Trainers: Fluid or Mag
I haven't looked at the specifics of the TCT high intensity low rpm workout. How high is high intensity, how is it measured, and how low is the rpm?
May
16
revised Does Bike or Rider Weight / Groupset affect cruising speed on the flat
added 13 characters in body
May
16
answered Does Bike or Rider Weight / Groupset affect cruising speed on the flat
May
15
comment Does Bike or Rider Weight / Groupset affect cruising speed on the flat
How are your watts being measured? And, the guy who claimed to be able to cruise at 30mph at 250 watts must not be riding a bike like yours -- that would imply very low rolling resistance and a CdA of around .145 m^2, which is lower than most unfaired recumbents and in the range of several faired recumbents.
May
14
reviewed Approve suggested edit on Are there front looking mirror options?
May
12
answered Are there front looking mirror options?
Apr
25
reviewed Approve suggested edit on Correct inflation pressure for old road bike
Apr
23
awarded  Excavator
Apr
23
revised Does drafting cause resistance to the lead rider?
added 179 characters in body
Apr
23
comment When Mark Cavendish says he's sprints at 1500 watts how long is that for?
Cavendish is listed as 69 kg so it couldn't possibly be 30 seconds -- 1580 watts/69 kg = 23 watts/kg, which is twice what world-class riders specializing in track sprints put out. World-class track sprinters can average 23 watts/kg for 5 seconds, but it's much more common that in informal articles like this people (not just Cavendish) are quoting their one second maximum.
Apr
19
awarded  Good Answer
Apr
5
comment Headwind when riding in a loop
It's good to be skeptical but decreased drag at non-zero yaw is a fact verifiable both in wind tunnels and on the road -- the only issue is the magnitude of the effect. If you race in events where seconds (or fractions of seconds) separate placements, it certainly can be both relevant and significant; if you don't, it won't be either.
Apr
4
comment Headwind when riding in a loop
By chance, Damon Rinard (who translated the Pivit article referenced above) happened to answer a question about decreasing drag with non-zero yaw earlier today.
Apr
3
comment Headwind when riding in a loop
Effective drag can decrease with non-zero yaw (that is, the effective CdA can decrease). This has been shown not only for components like wheels and frames in wind tunnels but also for riders on complete bikes. That said, this is a small effect and it depends on the yaw angle (which depends on the loop, the rider's speed, and the the wind speed and direction) so from a practical perspective it's rarely important. I've upvoted your answer because it addresses the OP's direct question -- I was only mentioning this for completeness' sake.
Apr
3
comment Headwind when riding in a loop
This is a good and conventional answer but incomplete. The fuller answer, which may not be what the original questioner intended, depends on the the shape of the loop and how the rider's aero drag varies with yaw angle. Imagine a loop shaped like a triangle, with two outbound legs heading upwind but not straight upwind, and the inbound leg heading straight downwind. Now, add this twist: at non-zero yaw, some (but not all!) bikes/riders experience lower drag than at zero yaw. That is, they "sail." In this case, they can go faster on the loop with some wind than in a calm.
Mar
29
comment hill climb tt pacing strategy for short steep hills?
Well, first, bicycles.stackexchange prefers questions that can be answered, not just discussed; but, second, I try to know and do as little training as possible. Coaches and racers do ask me for advice and information but not about training.
Mar
29
comment hill climb tt pacing strategy for short steep hills?
A second issue is how the OP measured his power: with an on-bike power meter on hills, or indoors. Estimates of what he can sustain for X minutes can differ depending on how it was measured and the grade he tested on, especially when the anaerobic component is large.
Mar
29
comment hill climb tt pacing strategy for short steep hills?
Constant power output is time-minimizing only when the conditions are constant. If the slope varies (or the wind blows differently on different parts of the course) the time-minimizing strategy is to vary power. The optimization problem is finding a (varying) pacing strategy that gets you to the top of the hill in the shortest time while meeting constraints on energy expenditure. That's a difficult and interesting problem, particularly when the durations are so short and the work rate will be above VO2Max.
Mar
23
reviewed Reject suggested edit on What is a good camera arrangement for city riding?
Mar
23
reviewed Approve suggested edit on How can I stop my mudguards from rattling?