Originally Posted by
HillRider
OK, I follow your reasoning and it's likely correct. However, as I mentioned, the inner double chainrings I have do not have any rotational indicator (i.e. the little triangle) on them so it's a guess how they to be installed. Maybe the bolt hole with the tooth count and Shimano name engraved around it goes 180° from the crank arm the way it is on the one triple I have.
Timing only comes into play with gated shifting whereby the exact place where the shift starts is predictable. Otherwise there's no basis onwhich to time anything. It's the same on cassettes or freewheels where the gate on each sprocket has to be in the right place with respect to the neighboring sprocket for a smooth shift. Before gated shifting (hyperglide) it was random, so there was nothing to time.
Originally Posted by
HillRider
Now, a question. What about a 40T or 45T chainrings where the tooth count is evenly divisible by 5? Are they exempt from rotational position effects?
No they're not immune to the effects, except that if they're not timed right there's noting you can do about it. And if they are timed right, they would be in any orientation.
Now, can I upload a photo directly from my computer to BF, or do I need a photo sharing service?