by Ferrous_Head » Wed Apr 22, 2020 7:48 pm
In my opinion the chronometrics really aren't worth it.
The chronometriucs are made like a clock. The have gears which are turned by the input cable so they will be accurate. More accurate than a magnetic instrument.
The magnetics have a magnet that is spun by the cable and the spinning magnet drags the indicator around the dial (magnetic coupling if you like). It ha a spring to stop it from "just spinning" but of course this is not a direct drive setup like the Chrono's. So they aren't as accurate.
What does that mean in the real world ?
Pretty much sweet bugger all. It might be useful running the bike on a dyno. It might be useful if you drag race and have worked out the exact RPM for launches and shifts. (although I doubt that even).
I run a tach on my race bikes. The ONLY time I ever use it is coming off the line. And even then it's more for reassurance than anything else. I can get by fine without looking at it.
Almost no one ever looks at a tacho while riding. It's actually a dangerous thing to do if your traveling at speed.
You can run the RSM's. You can even run the Veglia's from 1970 - that's what I run on my race bike now. They are very cheap. $50-70 brand new on Ebay.
The other thing is the chrono clocks change in discrete steps - like the second hand on a digital clock. The magnetic's do a graceful sweep of the dial.
"I know only too well the evil that I propose, but my inclinations get the better of me."