For context, i asked a bike brand for a chainring collab
They measured my chainring chain pitch to be 13.13mm (image 1). When i measured my own, it shows 12.7mm (image 2). I asked them how did they measure, then they ghosted me for a month then replied with "???". Dude wtf? Did i measure mine right?
Ignore the tooth profile n stuff
by TRIPL1ONLY
5 Comments
Modern chains should be 1/2” pitch, so 12.7mm.
I would have to be making something very unique for it to be worthwhile making a chainring from scratch. Good rings have some pretty intricate 3D profiling to the teeth, even more so if they’re made to shift. I would be looking long and had for an off the shelf solution for a chainring that worked for me, or making my own adapter to use an existing ring long before making my own.
Maybe they’re measuring the arc length instead of the chord length.
Edit: Why are they sending you a photo of their screen? Do they not know how snipping tools work?
If I were you, I would post this over at r/machinists too
What on earth is driving you to make your own chainring? Making your own direct mount spider or your own adapters makes sense. But your own chainring??
I’m going to take back what I just said, and rather ask a question first:
Is the 13.13 they show a measurement by them (your collab partner) on a drawing *you provided them*? Or is it an example they’re providing you of “proper’ centerline spacing?