チェーン：ワット数を無駄にしないで！ #チェーン #自転車メンテナンスの基本 #サイクリング #自転車メンテナンス #自転車

チェーン：ワット数を無駄にしないで！ #チェーン #自転車メンテナンスの基本 #サイクリング #自転車メンテナンス #自転車

After aerodynamic and tire rolling resistance losses, the next biggest inefficiency in your bike is frictional losses through the transmission. Although I’ll be concentrating on the chain, it does interact with other transmission components like the chain wheel, the cassette, and jockey wheels. So, the chain really can’t be seen in isolation. A a new and clean transmission can be around about 98% efficient. If you have a worn and particularly dirty transmission, that can drop down by about 5 percentage points. That 5% may not sound much, but if you’re outputting around about 400 W, it means your transmission could be costing you around 20 W of energy. And that’s 20 W that’s not propelling you forward. In addition to those transmission losses causing you inefficiency and therefore slowing you down, they also cause wear on the chain. A worn and inefficient chain though does interact with these other components and that can cause those to wear. And if you have to replace not only the chain, but also the cassette and maybe the chain rings and jockey wheels, that can get quite expensive. then it’s worth looking after that chain not only from an efficiency point of view but also from a cost point of view. I was planning to make a relatively short video about chain maintenance so that you can make your chain last longer and make it more efficient. However, I did some research before making that video and that has challenged some of my own preconceptions about chains and chain maintenance. To cope with that, I’ve got to dig much deeper and therefore I won’t be able to make a single short video. Because of the amount of material I’ve got to cover, I’m going to be making a series of shorter videos and they will be broken down into various subject matters. Hopefully, they will be bite-size. However, they will build upon each other, and although I’ll try to make them stand alone, I will almost certainly have to be referring back to earlier videos. Now, I did make an earlier video about chains, and there’s a link to that in the top right hand side of the screen. That video is about why you shouldn’t be rejoining modern chains. That advice still stands, so I won’t cover that in these videos. The first video in the series will cover the structure and function of the chain. That is key information that’s needed in order to understand how to improve both the efficiency and the longevity of the chain and other transmission components. And then in subsequent videos, we’ll start to look at things like do narrower chains wear out more quickly? How does friction and wear occur? And what is the best form of lubrication? If you don’t want to miss those videos, then you can subscribe by clicking on the 5minute bellow round now and also turn on notifications by clicking on the bell icon. [Applause]

5MV-Ch1 – Chain: don’t waste watts!
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https://www.buymeacoffee.com/fiveminutevelo
In this introduction video to a series of short videos about bicycle chain maintenance I explain that looking after your chain (and the rest of the transmission) can make your bike both more efficient and save you money in reduced parts and labour. A well maintained chain is both quicker and cheaper.

In subsequent videos I will cover various subjects relating to chain maintenance. There will be a number of videos that will build on each other.

Here is an earlier video about making bicycle transmission components last longer. https://youtu.be/k1B64rAO8bQ

Here is a link to a video I made some time ago about why you should not re-join a modern chain (using the removed joining pins).

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About the 5MV channel
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My name is Terry and I love cycling. I have named my channel “Five Minute Velo” (5MV). I have called it 5MV because the videos I upload will (mostly) last no longer than five minutes. Each video will cover just one subject that is described in the title. Although the channel is mainly about cycling on the road, I will also cover some light (gravel) off road riding, cycle touring and ebiking. No matter what, much of the advice will be pertinent to many branches of the sport/pastime.

I welcome constructive comments that will help me improve the videos that I produce and upload.

There may be some dry humour in some of the videos, so dry it may not always be obvious :-).

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My Strava profile can be found here:
https://www.strava.com/athletes/7723982

Cambridge Cycling Club website:
http://www.cambridge-cycling-club.org.uk/

Instagram
https://www.instagram.com/fiveminutevelo/

Photos of 2019 Tour of low countries:
https://photos.app.goo.gl/3ierczDfurM1gTGi7

Photos of 2025 Tour of Spain and France:
https://photos.app.goo.gl/Sgy8d9b4fxGZ18x49

Random cycling photos (will be updated from time to time):
https://photos.app.goo.gl/VZBhCWcQZtynsJF1A

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Terry