Originally Posted by
SethAZ
I did read your post, actually. To clarify, if you're brushing the brake pad because the rim itself between the spoke-hole edge of it and the tire bead isn't stiff enough, then your positing that the entire rim all the way around is bending through that region such that that bend induced by the contact with the ground at one angle results in flex on the opposite side of the rim in the opposite direction, right? I'm having a hard time seeing that happening. I would think that a non-stiff rim through the central region of the rim between the spoke holes and the tire bead area would behave more like a non-stiff rim in the examples in that linked article, and be less likely to brush the brakes.
So how are you so sure that it's the rim that's at fault for your brushing the brakes against the rim, and not your spokes being unable to keep the whole rim from tilting?
“I assume this is what you’re talking about, and not the amount of flex at the “brake track” which is almost purely dictated by spoke stiffness.”
I specifically said that flex at the brake track is caused by spokes not being stiff enough. We are in violent agreement here.
Spoke hole to bead stiffness is what I think dictates the snappiness of the rim - I assume this is what one would care about on the track. It’s also what matters when talking about lateral stiffness in corners. It doesn’t matter how stiff your spokes are if the rim pivots around the spokes’ anchor point.
This is a good video: