Power meters and all related data analysis. Power meters measure direct force applied to one of the pedals, crankarm, crankset, rear hub, or other methods. They use cadence in conjunction with the force to measure the power or wattage.

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1answer
46 views

Can I fit a 105 crank arm (stages) to a Claris 2400 crankset?

I currently have a Specialized Secteur with a Shimano Claris 2400 crankset (compact). I'd like to buy a Stages power meter but they do not sell Claris crank arms. Can I simply put a 105 crank arm on ...
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2answers
121 views

How do I use my power meter file to improve my time up this steep hill climb tt?

The hill is 0.8km long with an average gradient of 13%. My cadence on my 46t-36t 11-25t 9 speed gear ratio starts at 80rpm and rapidly dips to 40 rpm. Is there a way to calculate what gear ratio is ...
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2answers
166 views

Can I get my sprinting ability back?

At the end of January this year I purchased a power meter in an attempt to improve my training and general speed. I also performed the obligatory barrage of tests for 5 second, 1 minute, 5 minute and ...
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5answers
766 views

What's the lowest safe cadence on a climb?

I recently installed a power meter and just used it to get up some rather steep 15%+ climbs. At my weight and lowest gearing (34f 30r) at a sustainable power level for my fitness (225w) this ...
4
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3answers
889 views

Analysis of Stages high-speed data

A while ago Stages added a new feature to their power meter: High Speed Data recording added to capture pedaling force (kgf) and torque (Nm) 64 times per second for post ride analysis (.csv ...
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1answer
136 views

Allen Coggan power profile table for Cyclo cross riders?

If you were to create a power profile based on those seen in training and racing with a power meter by Hunter Allen and Andrew Coggan. What would it look like a sprinter or an all rounder? To help ...
2
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2answers
155 views

Is it worth separating your vo2 max wattage's on the flat and hill climbs in order to provide clearer goals during training?

My watts per kg on hill 5 minute hill climbs seems to be 30 to 40 watts higher than what I can achieve on the flat. This is where I get dropped the most often during group rides and races. My ...
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5answers
430 views

Does Bike or Rider Weight / Groupset affect cruising speed on the flat

I posted this video on Facebook: ...
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3answers
146 views

Shifting can't keep up with my acceleration

I noticed that when I really give it hell after stopping or riding slow (I do that all the time on commute), I have to shift two gears at a time in the lower gears, to keep up with my acceleration. I ...
3
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4answers
823 views

Solar charger for iPhone whilst on a bike tour - is it worth it? [closed]

Are there any feasible solar chargers for iPhone / or with a usb slot that will work or is a backup battery available. Best value (and something that works) is my priority. I found this brilliant link ...
2
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1answer
52 views

Proper Weight input for a indoor power meter

When setting up the power meter on an indoor Elite Digital Mag Trainer should I put in my weight plus the weight of my bike when I input the weight?
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1answer
205 views

Allen Coggan Table - Formula for a best fit to time frames

I'm sure lots of people are familiar with the Allen Coggan Relative Power table that then relates your 'score' to what category rider you are. My question is that given rides/segments/hill climbs are ...
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3answers
687 views

What's best engine to motorize a road bike

I have a road bike I use for commuting and I'm about to move 20km further out, so I'm considering fitting a tiny engine to it to assist my ride to work. However, where I live I have a restriction - ...
2
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2answers
925 views

How can i calculate the power in watts on an indoor trainer

I am trying to calculate the power needed to hold a steady speed on an indoor trainer, so as I can train using power in watts. I set the bike up and put the crank at 90 degrees, then put a weight of ...
2
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2answers
3k views

How accurate are indoor trainer power meters?

I recently got a Tacx Flow trainer, this being the first time using a power meter. For about 10 years, however, I have been doing monthly "uphill time trials," whereby I put the time into that formula ...
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4answers
2k views

Extra power needed uphill for weight increase

How much does weight mean when going uphill? Let's say I'm going up a mountain with 1000 m of elevation and it's quite steep: 10%. Let's also say I can maintain 250 watts. If I add 1 kg of weight to ...
4
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2answers
902 views

What is preferred lacing for PowerTap wheel build?

I've done quite a few wheel rebuilds to make them stronger, but haven't built up a wheel around a PowerTap (SL+) yet. This will be for a training set for a fit triathlete. Raw weight is not an issue, ...
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3answers
1k views

How can one estimate drag for a bicycle?

I am curious how to estimate drag for a bicycle. This has two different framings: Find the amount of power required to ride at a certain speed. That is, when one is traveling at a constant speed, ...
4
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2answers
4k views

How accurate are the power numbers from a Tacx Flow?

How accurate are the power numbers (watts) from a Tacx Flow? Multiple aspects : Absolute number : can they be compared with numbers from other power meters ? Relative : if ride two times at 200 W for ...
4
votes
4answers
9k views

How do I calculate the power required to climb a hill at a given cadence?

Suppose I ride at a cadence of 50RPM for 10 minutes with a 39x23 gear ratio on a hill with 10% grade. Is there a simple formula to calculate the power output required?
15
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3answers
9k views

How do bicycle power meters work?

What exactly are they measuring? How do they measure it? What are the implications of the different approaches on accuracy / speed of getting a good measure? It would be helpful if someone could ...
7
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5answers
2k views

Does gear ratio affect Power?

Let me preface by saying that this may not be the right SE. I considered asking on the Physics SE, but I thought I might try here first. If it is wrong, I am not against it being migrated. From basic ...
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6answers
1k views

What's the cheapest way to get into training with power?

I used to train with a stopwatch, and later on, heart-rate. Both required relatively inexpensive tools. Now I'm interested in training with power (measuring the watts produced) and I'm finding that ...
7
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5answers
1k views

What are the 'easiest' ways to determine functional threshold power?

I recently picked up a powertap and have done a fair bit of riding around and a few races now with it on, so I've started to get familiar with some of the numbers. I would like to figure out what my ...