I was thinking about chain wear measurement the other day and really want to try to use vernier caliper for that purpose, however, it is not clear how to do it properly.
I want to have some precise tool which is easy to use with good feedback, informative. KMC has a nice digital tool which is in effect a digital vernier caliper with modified lips, but it has a 'cycling' price tag to it.
One can just use a digital vernier caliper and get similar results, plus be able to use it on plenty other applications unlike the KMC tool.
The question is, how to use it and which formula to use. I have stumbled across this instruction on the Internet:
https://www.pinkbike.com/u/notdannyhart ... liper.html
It does not specify how they come up with those digits or how to use it on different lengths.How to measure chain stretch using vernier calipers (preferably digital for more accuracy).
1) Open the caliper to 5.6 inches/142.24mm.
2) Insert the inside caliper between the chain rollers.
3) Extend the calipers and record the measurements:
New chain= 5.715 inches/145.161mm
1/2% stretched (consider looking for a replacement)= 5.745 inches/145.923mm
3/4% stretched (replace)= 5.760 inches/146.304mm
1% stretched (replace immediately along with new drivetrain)= 5.775 inches/146.685mm
I tried to use it for same length - one chain link, so just subtracted 12.7 from the number. Seem to be getting realistic results like that, but where they take the numbers from?