Rotor debuts Universal Tooth Design chainrings for SRAM, Shimano 11 & 12 speed MTB

PLUS! They are made of a much stronger metal and last far longer than (SRAM) others. I have never ridden Shimano…but, I know the Rotor (34Q) lasts far longer than SRAM (and never not once ever had bad shifting on the current tooth system).

Shimano 12spd hg+ chains specifically require 3.2mm thick tooth, while Sram 12spd mtb & SH 11spd require 3.6mm. This small change, changes everything.

So it may work ok on one chain but will never work fine on the other simply because too thin teeth will drop a chain. If that would be doable with no major issues all other aftermarket companies would be already doing it for years because it would reduce their sku count. But guess what – no one does.

Narrow wide chainrings specifically rely on the precise thickness of the thick tooth as this is what holds the chain.

@nuno miguel We launched Sram Flat Top-compatible rings in August of 2020, and have expanded ring offerings across sizes & BCD since.

Of course they are 100% compatible, as in both chains will fit – but its obviously done by making the teeth narrower to allow it to work with the narrower Shimano chain, leaving it 0.4ish mm narrower than it should be.

Absolute Black, Wolf Tooth etc make two tooth patterns for this reason, there isnt a clever way to design around the reality that there are two different chain widths and I am sure you would agree if there was they would have both done it rather than go to the effort of making entirely different chainrings.