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Questions tagged [power]

Power meters and all related data analysis. This includes how to train with power. 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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How to adapt a 130 BCD Crankset to 110BCD for fitting a power meter?

I have a Cube road bike with a Shimano Ultegra R6703 crankset. In shopping for affordable power meters I have come to the realisation that there are none with a 130BCD 5-bolt pattern for fixing to the ...
Healthyboi's user avatar
4 votes
2 answers
137 views

Power output changes with gradient

Parallel question to this one: How does a cyclist's power output vary as gradient changes (assuming constant effort), compared to a baseline of cycling flat? I'll state some of the obvious things: ...
Bennet's user avatar
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9 votes
3 answers
2k views

Power and climbing speed

I live somewhere very, very flat (bridges are the biggest hills around) and I'm planning some hilly routes for a bike holiday. I have a decent idea of how much power I can produce, but less sure how ...
Bennet's user avatar
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1 vote
3 answers
100 views

When does power meter accuracy matter?

For a given use case power meter accuracy may or may not matter. Here are two use cases: BikeRumor - Power Meters Explained No matter which power meter you land on, the most important aspect is ...
David D's user avatar
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6 votes
1 answer
281 views

How can consumers test if their power meters are accurate, and how should we address discrepancies?

How might consumers determine if their power meters are accurate? As additional scenarios, what might they do if they have two power meters whose readings diverge, or if they have three and one ...
Weiwen Ng's user avatar
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4 votes
1 answer
312 views

Accuracy of pedal-based power meters when used with pedal extenders / pedal spacers

Is the accuracy of a pedal-based power meter (examples) significantly affected by using them with pedal extenders (example)? Thank you.
Jim's user avatar
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5 votes
2 answers
549 views

How do I evaluate a Crit race (based on stats)

So I recently did a Crit race (I only do 1 a year in my home town) this year I upgraded the bike and it's fitted with a power meter so I can see the race statistics. The race was locals only. and ...
Mech_Engineer's user avatar
4 votes
2 answers
642 views

Can a lightweight cyclist climb better than the heavier one by producing less power?

I guess it's possible because on the climbs you need to beat gravity more than the wind resistance but is there a formula to calculate how much the weight of the rider affect the climbing performance?
Ender's user avatar
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5 votes
2 answers
496 views

XTR 9100 left power meter on XT 8100 crankset

Can I put a stages XTR 9100 left side power meter on a XT 8100 crankset? Seems like it should work, but haven’t found a clear yes answer.
Hannes Hertach's user avatar
3 votes
1 answer
1k views

Is a Shimano Ultegra FC-R8000 Crankset Compatible with a Shimano 105 5700 10-speed Groupset?

I have a 2012(?) Bianchi Via Nirone 7 with the following components: Cassette: Shimano 105, CS-5700, 11-28, 10-speed Crankset: FSA Tempo, CK-C200-3, 50/34, 172.5mm Rear Derailleur: Shimano 105, RD-...
vkaczkowski's user avatar
5 votes
3 answers
218 views

What is the ideal physique for a hand-cyclist? [closed]

A handcycle is a tricycle that is powered by the rider's arms, not by their legs. an upright style. Note lap-belt and foot straps, and an extremely laid-back head tube angle. An aggressively aero ...
Criggie's user avatar
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4 votes
1 answer
384 views

eBike torque sensors: Are hub systems capable of the same ride feel as mid-drive?

There are two basic types of ebike controller - cadence or torque sensing. Typically mid-drive ebike systems use torque sensing to control the motor, and cheaper hub drive systems often use cadence ...
SamA's user avatar
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-2 votes
1 answer
134 views

Holding all other things constant, what is the performance difference of adding a pound of weight to each pedal on a bicycle?

I am looking for an answer that may include watts and/or calories per hour only. Please do not discuss wheels, tires, bearings, body weight, frame weight. Just help me understand the physics of adding ...
Ben Marshall Berg's user avatar
4 votes
1 answer
870 views

Giant Power Pro no longer reading power on right crank after washing bike

2020 Giant TCR Advanced Pro. I washed the bike and per the title, the right side power reading has gone to zero. The right side still lights up and charges, and I was able to use RideLink to update ...
tim654321's user avatar
  • 163
6 votes
3 answers
2k views

Crank-based Power Meter for Shimano Sora

I am a junior amateur cyclist and I have a road bike with a Shimano Sora groupset (shifters, crank, front and rear derailleur, cassette). I am looking to step up my cycling to the next level and have ...
Codingwiz's user avatar
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21 votes
15 answers
4k views

What applications exist for bicycle power, besides propulsion? [closed]

The dynamo light uses the power of a bicycle and rider to generate light. Are there other such inventions, intended either as accessories to the bicycle, or intended to be powered by bicycle mechanics ...
SamA's user avatar
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0 votes
1 answer
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I have a brand new e bike battery test is good

No power when I connect battery to bike. Battery checked out good. If I put direct power to the bike the screen powers up but nothing to the motor. Any s
Tom's user avatar
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5 votes
2 answers
3k views

Giant power meter left/right balance

I have a Giant TCR Advanced Pro 0 Disc 2021 which came with the Giant PowerPro power meter built into the cranks. I've seen people posting things like, "Don't take too much notice of the L/R ...
theonetruepath's user avatar
8 votes
4 answers
3k views

How to convert calories to watts on Strava rides?

I'm trying to find out how I can convert calories into Watt hours on Strava rides. I know the formula that 1 kJ = 1000 Ws but calorie unit is different. When I looked up to the formula to convert ...
Ender's user avatar
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4 votes
3 answers
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What is the maximum watt per kg a human can sustain?

I think there was a formula for that by Michele Ferrari but I can't find it on the net. I think it can't be bigger than around 6,5 watt per kg for at least an hour or so. Does anybody know the exact ...
Ender's user avatar
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4 votes
1 answer
192 views

Is there publicly available data on riders' critical and maximum power?

I am doing some statistical research about bicycles and riders. Now I need the peak power or max power and critical power of riders (professional or non-professional). But it seems really hard to get. ...
Jinning Liang's user avatar
5 votes
1 answer
3k views

Metabolic equivalent of task (MET) vs cycling power in W/Kg

In the Wikipedia page of the Metabolic equivalent of task, one MET is defined as 1 MET = 1.162 W/Kg. In the same page, it's claimed that the activity level of bicycling, on flat, 10–12 mph (16–19 km/...
Alessandro Cosentino's user avatar
2 votes
1 answer
468 views

How do I measure my crank-arms?

I am interested in getting a left-side power meter for my road bike. It has Shimano 105 components. I'm considering a 4iiii Precision left-side crank, in a 105 or Ultegra version. I looked, and don't ...
Duncan C's user avatar
  • 241
4 votes
4 answers
1k views

What to consider buying a single left side power meter from stages?

My current crank arm is 175 cm. I have a Giant Contend 3 with the following parts: Rear Derailleur- Shimano Claris Front Derailleur - Shimano Claris Crank - FSA Tempo, 34/50 Bottom Bracket - ...
tread's user avatar
  • 201
0 votes
1 answer
618 views

Stages Power Left Compatibility with Shimano Sora

On my Cube Attain Pro 2021 bike I have a Shimano Sora FC-R3000 crankset(175 mm - 50/34T). Compatible with my budget, I'm planning on investing in a Stages Power Left power meter to get wattage data ...
Can Sürmeli's user avatar
10 votes
3 answers
822 views

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

In lots of places, I see the concept of "normalized power" recommended for measuring the intensity of a workout and it is claimed in many of these places to be superior to "average ...
Byron Dom's user avatar
  • 151
2 votes
2 answers
364 views

Upgrade path to use Stages Cycling power meter on Octalink

I've recently bought a used Scott Speedster 40, I would like to add a Stages Cycling power meter left crank arm (the 105 or ultegra with hollowtech II) to this, since the more data the better :) The ...
Martin Lind's user avatar
9 votes
7 answers
5k views

Is it possible to burn only ~850 cal. on 1.5h / 20 km fast bike ride?

I have just recorded two following activities (I am 42 years old and seriously fat / 108 kg): Hike: 9.04 km / 1h20m / 90 m elev. / 1,220 kcal Bike: 20.26 km / 1h25m / 146 m elev. / 837 kcal Is this ...
trejder's user avatar
  • 544
3 votes
1 answer
573 views

Quarq dfour installation

I'm looking into getting a sram quarq dfour power meter, but I'm a bit confused as to what parts I need. I have a Specialized Diverge 2021, which comes with ultegra RX810. I know I need the spider. Do ...
moinudin's user avatar
  • 131
0 votes
1 answer
292 views

How does Strava treat power data while resting?

I'm trying to understand how strava treats power data when there's no power I think power is included when you are riding downhill (0 power, non-zero speed). What about the idle time while you sleep ...
eugene's user avatar
  • 599
-2 votes
1 answer
124 views

Which bike independent powermeter to choose for non-click pedals? [closed]

I (will) have the following bikes: Bike1 (current bike): https://www.boc24.de/p/compel-rr-100/213327/#itemId=213327-1 Bike2 (potential): https://www.canyon.com/de-at/gravel-bikes/all-road/grail/grail-...
Tlatwork's user avatar
  • 201
1 vote
1 answer
88 views

What additional material do i need for the installation of my powermeter?

I bought the following powermeter: https://www.mantel.com/de/4iiii-precision-105-r7000-left and shortly after i had to Switch bikes. I (will) have the following bikes: Bike1 (current bike): https://...
Tlatwork's user avatar
  • 201
0 votes
0 answers
107 views

stages power meter, which crank arm do they use?

stages claim that their product add only tiny bit of weight to stock crank arm (15g?) I'm looking for sram compatible ones. And I think sram eagle sx/nx/gx/xx1 crank arm has different weight. So my ...
eugene's user avatar
  • 599
4 votes
2 answers
338 views

Power meter upgrade on 2015 Surly Long Haul Trucker

I have a 2015 Surly Long Haul Trucker with a Andel RSC6 crank and Shimano UN-55 bottom bracket. Is there a crankset I could replace that with that would be compatible with a single side power meter?
Etchisketchistan's user avatar
5 votes
2 answers
671 views

Why are electric bikes ranked on torque ratings?

A major ranking criterion for electric bikes is the torque rating of the motor. Generally speaking, bikes/motors with higher torques are sold at a higher price than bikes/motors with lower torques. As ...
Phylliade's user avatar
  • 161
3 votes
1 answer
438 views

Is there a left-sided powermeter that requires less than 8 millimeters of clearance?

I'm willing to spend some money on a powermeter to train a tad more effectively on my bike. The problem is, that my frame (Trek Checkpoint ALR 4 2018) does not have the required clearance between ...
Marco's user avatar
  • 213
5 votes
2 answers
463 views

Cockpit tech: ANT+ Power meter → Android phone?

Question Has anybody had any success getting ANT+ only equipment to talk to Android apps? I'm only talking about a situation in which the Android phone specifically has ANT+ capabilities; obviously if ...
GT.'s user avatar
  • 223
0 votes
0 answers
39 views

Windgo ebike charging problems

Hi I've been asked to try and repair a friends Windgo ebike problem is with the battery/power it's a new bike yet is not turning on. Also the battery shows the illuminated Red light always and doesn't ...
Alan Walsh's user avatar
0 votes
4 answers
1k views

What makes one bike faster than another when same wattage is applied?

I have two bikes. One is a $7k+ Cervelo S-Series, and the other is a <$1K Trek Domane AL 2. With the same perceived effort applied, my Cervelo goes much faster. I am able to routinely hit above ...
User's user avatar
  • 201
3 votes
2 answers
922 views

App for displaying 30s rolling average power

I use a power meter without a dedicated cycling computer like Garmin or Wahoo, I prefer to ride with my phone on the handlebars. I found a couple of cycle computer apps which can be paired with the ...
ttarchala's user avatar
  • 2,689
2 votes
1 answer
5k views

Garmin watch as a power meter

I've a Garmin fenix 6 watch and was wondering can I use my watch as power meter if I connect my watch garmin bike sensors ?
habdie's user avatar
  • 159
4 votes
1 answer
320 views

What are the values of Average Power Phase in the .FIT file?

I'm trying to understand the Average Power Phase values inside the .fit file. There are four of them, for example avg_left_power_phase: (355.7812555590821, 199.68750312011724, 202.50000316406255, 97....
JirkaV's user avatar
  • 245
4 votes
2 answers
1k views

What is the cheapest and easiest way to add a power meter to my Diamondback Haanjo 4?

What is the cheapest and easiest way to add a power meter to my Diamondback Haanjo 4? It has a Praxis M30 BB and a Praxis Alba crankset. Thanks!
Jack Shi's user avatar
2 votes
1 answer
1k views

How to interpret Strava power curves?

Check out the power curve at the bottom of the post, it's composed of two screen caps from the same ride, stacked on the same image: Apparently on the ride in question the cyclist rode at: 291W for ...
Lamar Latrell's user avatar
3 votes
2 answers
552 views

What power meter would work on my bike?

I have a 2015 bike with a Shimano 105 group set the cranks are 172.5mm and behind the crank is says the following. I’m relatively new to cycling and want a power meter please help cheers
Joel's user avatar
  • 31
11 votes
4 answers
4k views

Does rocking the bike side to side when e.g. sprinting or climbing help?

Or would more power go through the pedals if the rider held the frame still/upright? Or is there little difference? How would it be measured and what are the forces acting on the bike when rocking ...
Wilskt's user avatar
  • 1,300
4 votes
2 answers
2k views

Understanding how to calculate critical power curves

Hello fellow cyclists, There are services out there that can calculate power curves based on your bike ride (when training with a power meter). This curve shows the time to exhaustion (t) based on ...
Sascha S's user avatar
2 votes
2 answers
5k views

Changing cranks from Praxis to Ultegra (BB advice)

I purchased a Specialized Roubaix Comp 2018 last year, I was not intending to purchase this bike but Evans had a 40% off sale and the deal was too outrageous to pass. I was originally looking at bikes ...
Axemasta's user avatar
  • 303
2 votes
1 answer
431 views

Power output on rollers doesn't seem to match perceived effort

I have a Garmin Vector Power meter (one-side) and I use plain Tac-X rollers with no technical bits on them. My speed and power come from sensors on the bike. My power output seems low relative to my ...
doc's user avatar
  • 123
1 vote
1 answer
186 views

Can I achieve good cycling shoe stiffness in winter with a boot insert?

Background: I ride daily in a very cold climate (Fairbanks, AK). My typical winter riding footwear includes a pair of trail running shoes underneath an insulated (NEOS) overboot, as this is a very ...
Poquontchn's user avatar