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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 1 year, 9 months |
| seen | 2 hours ago | |
| stats | profile views | 67 |
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Sep 6 |
comment |
How to significantly lower HR[avg] while improving performance output The simplest way is to use an online calculator such as this one, which gives an estimate of around 215 watts or so. If you weigh 67kg, your average output was around 3.2 watts/kg. A quick alternative is to note that you climbed roughly 800m in ~3000 seconds, so the quick estimate is 75kg * 9.8 m/sec^2 * 800 m / 3000 secs which is right around 200 watts for the potential energy component. |
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Sep 6 |
answered | How to significantly lower HR[avg] while improving performance output |
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Sep 6 |
answered | Are there research graphs for the Rotor Q Ring system? |
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Sep 1 |
awarded | Nice Answer |
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Sep 1 |
revised |
Why am I slow on flat surfaces? clarify CIL. |
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Aug 31 |
answered | Why am I slow on flat surfaces? |
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Aug 31 |
comment |
Why am I slow on flat surfaces? Do you mostly ride alone or with others? When you say you're "very fast" up hills or in strong head winds but "can't seem to keep up" on the flat, does that mean relative to the same other riders, or do you mean that you're faster than "average" when on hills and in the wind but not so on the flat? |
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Aug 28 |
awarded | Nice Answer |
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Aug 27 |
comment |
How much friction arise from the tires? As I mentioned above, the old Continental tests were performed on a single (homogeneous) surface. You can see some examples (but with no detailed results) of contemporary test rigs here: bikeradar.com/news/article/… In addition, there are ways that interested amateurs can measure rolling resistance at home or in the field, on a variety of road surfaces. |
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Aug 27 |
comment |
How much friction arise from the tires? That's a good chart but I didn't mention it earlier because it's both dated and incomplete. That chart is based on tests done about 20 years ago at the Continental Tire facility using a large diameter asphalt-surface driven drum; no other surfaces were checked and it is known that road, tire, tube, tire-rim attachment, and additional suspension characteristics can affect total rolling drag. In particular, inflection or "break" points in rolling drag have been observed in some tests on other types of surfaces with increasing pressure. |
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Aug 26 |
comment |
How much friction arise from the tires? If all you're looking for is a source, then the best source is Chapter 6 of Wilson's Bicycling Science. However, wouldn't a better question be something like, "which factors influence bicycle tire rolling resistance and how are they measured?" |
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Aug 25 |
revised |
How do bicycle power meters work? minor grammar |
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Aug 25 |
awarded | Nice Answer |
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Aug 24 |
revised |
How do bicycle power meters work? drivetrain losses |
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Aug 24 |
comment |
How do bicycle power meters work? Although I refer to the SRM, Quarq, and Power2Max as "crank-based", they actually fit on or replace the spider. They're called "crank-based" because the spider usually goes with the right crank. I think one company may have tried to measure deflection forces on the chainstays. I don't know if anyone has tried spoke-based measurement; the spokes are a kind of "noisy" environment since they naturally change tension with every wheel revolution. |
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Aug 24 |
revised |
How do bicycle power meters work? added 8 characters in body |
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Aug 24 |
revised |
How do bicycle power meters work? supply-side vs. demand-side power meters |
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Aug 23 |
revised |
Real measurable benefit to ceramic bearings? added example |
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Aug 23 |
revised |
How do bicycle power meters work? added 11 characters in body |
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Aug 23 |
revised |
Safety vests: Yellow vs. Orange? minor grammar and clarification |
