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Input tandem weight on Strava

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Input tandem weight on Strava

Old 03-05-18, 11:56 AM
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ksryder
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Input tandem weight on Strava

OK this is just for my own curiosity, I take Strava data with a grain of salt but I also like to keep track of things.

I've recently started riding with a vision-impaired cyclist who is training for a big gravel race in a few months. He has a Salsa Powderkeg and we've been going on longer rides each weekend.

The Powderkeg has a claimed weight of apprx. 42 pounds. In Strava you can input different bikes to choose from when you upload a ride; the weight of the bike factors in to Strava's estimate for calories burned.

My question is: do I put in 42 pounds or do I divide by 2 to account for the other person doing half the work?

Disclaimer -- I know calories estimated are pretty inaccurate without a power meter. Let's assume that for all intents and purposes the two of us are the same size. From my own observations with a power meter I can safely assume I burn 600-700 calories per hour depending on effort.

Also if you don't use Strava and you think it's stupid then I'm happy for you but also I don't care.
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Old 03-05-18, 07:56 PM
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Alcanbrad
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Interesting esoteric question 👾. I wouldn’t believe entering half the bike weight and one riders weight would be accurate. Very roughly speaking: The stoker acts like a drafting single in that there is a savings of power by the drafter of upwards of 30%.

I would think that you need to take this into account. If you assume you are both equal in all ways, then the total energy burned would be about 1.7 times that of a single cyclist. If you entered half the bike weight and one persons weight, you could then take 85% of the strava calculated calories as yours.

A gain, this is very rough first order stab.
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Old 03-06-18, 12:12 PM
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ksryder
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Originally Posted by Alcanbrad View Post
Interesting esoteric question 👾. I wouldn’t believe entering half the bike weight and one riders weight would be accurate. Very roughly speaking: The stoker acts like a drafting single in that there is a savings of power by the drafter of upwards of 30%.

I would think that you need to take this into account. If you assume you are both equal in all ways, then the total energy burned would be about 1.7 times that of a single cyclist. If you entered half the bike weight and one persons weight, you could then take 85% of the strava calculated calories as yours.

A gain, this is very rough first order stab.
Thanks, I didn't even factor in the other rider's weight, assuming that since we're roughly equal it would cancel out.

I find Strava's estimates to be generous - based on my power numbers from my trainer vs. Strava estimates it's pretty high. We had a 3.5-hour ride on Saturday (and with the stiff south wind got a wind-assisted KOM on the way home!) and based on perceived effort I'd guess I burned about 2000 calories, vs. Strava which estimated about 2900 calories.

Either way I ate enough BBQ and donuts that day to cancel out the ride but it's still nice to be able to accurately quantify it.
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Old 03-06-18, 06:22 PM
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I append "Tandem" to the end of the ride name on Strava, and click the "hide from segment leaderboards" button; the latter in order to exclude my tandem rides from counting towards anything, since Strava still has no good way to account for tandem teams. I ("we")very quickly beat a lot of my solo segment times so it helps me to keep those times separate.

I know that some users go so far as to create a second Strava account with "tandem" in the name in order to keep those results separate from individual efforts.
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