Questions tagged [power]

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.

Filter by
Sorted by
Tagged with
2
votes
2answers
71 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 ...
9
votes
7answers
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 ...
3
votes
1answer
102 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 ...
0
votes
1answer
61 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 ...
-2
votes
1answer
104 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-...
1
vote
1answer
72 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://...
0
votes
0answers
45 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 ...
3
votes
2answers
139 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?
3
votes
1answer
182 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 ...
3
votes
1answer
161 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 ...
3
votes
1answer
122 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 ...
0
votes
0answers
22 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 ...
0
votes
4answers
201 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 ...
3
votes
2answers
580 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 ...
2
votes
1answer
2k 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 ?
4
votes
1answer
178 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....
4
votes
2answers
696 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!
1
vote
1answer
407 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 ...
3
votes
2answers
299 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
10
votes
4answers
2k 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 ...
4
votes
2answers
1k 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 ...
2
votes
2answers
3k 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 ...
2
votes
1answer
250 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 ...
1
vote
1answer
144 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 ...
-5
votes
4answers
686 views

Estimating climbing speed on climbs with variable grade

There are numerous calculators online which estimate climbing speed based on power and grade or similar. For example: http://bikecalculator.com/ https://www.gribble.org/cycling/power_v_speed.html ...
2
votes
1answer
801 views

Replacing Apex 1 crank arm with Shimano 105

I would like to buy a 4iii power meter integrated in a Shimano 105 crank arm. On my bike I currently have SRAM Apex 1. Will this be possible? Thank you!
1
vote
0answers
86 views

Need advice. SRM Origin alu vs Quarq Dfour [closed]

I am road cyclist willing to participate in local cycling races. I am looking forward to buying a new powermeter. Currently I have 4iiii left crank only and I want more accurate device to be more ...
6
votes
3answers
2k views

Can pedal-based power meters be used as flat pedals?

I would like to collect as much data as possible about my daily road rides so recently I am considering pedal-based power meters such as Faveor Assioma or Garmin Vector 3. However, I don't want to ...
1
vote
2answers
653 views

How much resistance comes from each part of a bicycle? [closed]

How does one decide which part of a bicycle is the best candidate to upgrade or tune if the goal is higher speed for the same energy? For example, should one upgrade wheels, or tyres, or change to ...
1
vote
1answer
67 views

Is SRAM RED AXS Power Meter, 48/35T compatible with Tarmac Pro Disc – SRAM ETAP

I am interested in purchasing specialized "Tarmac Pro Disc – SRAM ETAP" bicycle that comes with "SRAM Force AXS, 48/35T" crankset. I want a crank power meter and want to know if the "SRAM RED AXS ...
1
vote
1answer
221 views

Most effective > 200 mile ride training

On the 17th of August I'm doing a 250 mile ride in the UK in one day. I'm no stranger to longer rides often completing 100 mile rides and my longest ever was 175 miles (it was fairly unpleasant ...
2
votes
1answer
286 views

Campanolo record power meter crank with veloce crankset

Can I use a Stages Campagnolo Record left crank with my Campagnolo veloce crankset, if the sizes are a match? Want a power meter of some sorts and it would be far cheaper than getting vectors.
4
votes
1answer
68 views

Deore XT Power Crank

I have an Ultegra Crank set. I also have a Deore XT 175mm left side power crank. Can I use this on a road bike?
0
votes
1answer
59 views

Zero Offsetting P1 pedals using just Rouvy android mobile app

I don't have a bike computer, rather I use my old cellphone for that matter. Does anybody know how to do a zero offset of P1S pedals using Rouvy app? Apparently, there should be an option when you ...
1
vote
1answer
330 views

Since seat tube angle has little effect on max power output, why not adjust the reach with saddle setback?

According to this article, a seat tube angle between 65 and 110° has little effect on max power output. At most, it varied 1%. https://www.me.utexas.edu/~neptune/Papers/jab26%284%29.pdf Adjusting the ...
0
votes
1answer
2k views

Mixing Ultegra or 105 left crankarm with Shimano Sora support

I'm interested in buying this power meter: https://pl.aliexpress.com/item/XCADEY-Bicycle-power-meter-Crank-power-meter-Bicycle-GPS-Computer-Garmin-Edge-Bryton-IGPSPORT-Support-ANT/32798182129.html. I ...
7
votes
3answers
1k views

What method or algorithm is used for computing power curve on Strava?

Many cycling analytics apps like Strava, TrainingPeaks or GoldenCheetah are offering the critical power curve chart, computed from the power meter data. I'm familiar with the curve meaning and usage, ...
11
votes
3answers
14k views

Understanding e-bike power/torque

In the UK e-bikes are currently limited to a maximum of 250W assistance if you wish to use them on public roads. However, it seems that the motors do vary in terms of the available torque - from ...
2
votes
1answer
736 views

Crank power meter incompatible with my bottom bracket

I have received a 4iiii crank power meter 170mm length that I can't install on my Merida trainer bike because it has square taper bottom bracket. What would be the cheapest way to have it installed? ...
6
votes
3answers
2k views

What is the drag / power lost to a safety flag?

I have a recumbent bike that has a safety flag on the top of a thin pole, so it flutters around higher than and after my head. How much power am I losing to this flag that could be used to power my ...
3
votes
2answers
895 views

Quarq Dfour Fit Problem

I recently buy my first Quarq Dfour power meter to replace my crank Shimano Ultegra 6800. but I have the problem that the quarq spindle its too short ( 106 mm quarq vs 109 mm shimano ultra ). I don't ...
3
votes
1answer
626 views

Can a BB30 Crank Arm (Left) power meter can be used with a BB386EVO Crankset

I have read many websites and articles about the interchangeability of BB30 and BB386EVOsuch as this and this YouTube video. Many say yes and many say no. Yet, I am not sure which Stages FSA power ...
1
vote
2answers
233 views

Rear wheel power spoke pattern

This is my first time posting here. I have been biking for a few years now and learning little by little how to repair my ride myself. My latest problem is 4 spokes of my rear wheel (36 spokes) ...
5
votes
3answers
2k views

Changing from Ultegra 6800 crank to r8000 dual power meter

I currently have a shimano ultegra 6800 crank set on my 2014 trek speed concept 7.0. I want to install a dual side power meter and can only find the r8000 dual side power meter setup. Will the r8000 ...
0
votes
1answer
116 views

Seeking powermeter data [closed]

I am developing a small tool that allows to pick a day for a long cycle trip. The idea is to use weather forecasts to compute how bad/good the wind along the route in the following days is. You can ...
1
vote
0answers
126 views

XTR M960 Crank to Stages power meter compatibility

I want to buy a Stages power meter but my MTB has an old XTR M960 crankset. I wonder if a Stages XTR M980, M985, M9000 or M9020 left arm meter can be installed replacing the left crankarm of my old ...
2
votes
2answers
325 views

Laws against electric assist bicycle with energy recovery? [closed]

Is an electric bike like this required any special license. The power applied comes from the collected kinetic inertia from going down hill or stored from the rider then the stored power can then be ...
0
votes
2answers
670 views

How much faster can my commute be if I use a power meter?

When biking to work, my routes have have stop signs, stop lights, and other interruptions every few blocks or so. My understanding is that if I reach my power at target heart rate soon after stopping ...
2
votes
2answers
2k views

QUARQ DFour installation on Shimano bike

I'd like to replace my Ultegra 6800 crankset with QUARQ DFour powermeter. But I don't know how to choose between BB30 and GXP versions. I have Shimano Pressfit SM-BB92-41B bottom bracket. Do I need to ...
0
votes
1answer
233 views

What target heart rate or power do people use when commuting by bike [closed]

Biking to work is good exercise. It can make it easier to meet our exercise needs. When commuting by bike, what heart rate or power zones do people usually use? What's a recommended target? Should we ...