What is a bicycle chainline and how to measure it?

What is a bicycle chainline, why is it important, and how to measure it?

CONTENTS:
00:00 Introduction
01:49 Bicycle centre-line
04:30 Bicycle chain-line
06:13 Front and rear chainline
07:40 Offset frames
09:59 Why chainline matters 1
10:40 Measuring the front chainline
18:09 Measuring the rear chainline
27:43 Playing with the chainline
33:06 Catches and caveats

Useful LINKS:
Please use the BikeGremlin forum if you have any questions or comments:
https://www.bikegremlin.net/

Bicycle chainline article:
https://bike.bikegremlin.com/1755/bicycle-chainline/

Accurate vs precise, digital vs analogue - Calipers, how to use them - video:
https://www.youtube.com/watch?v=MeOaLwsSO5c

Rear hubs and their dimensions (and boost hubs):
https://bike.bikegremlin.com/158/bicycle-rear-hub/

32:38 How to properly shift gears on a bicycle - video:
https://www.youtube.com/watch?v=wfqbWDT749E

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List of all the BikeGremlin videos, sorted by categories:
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