Thanks 😊Great review wafter and a nice bike, good to see you're out and about enjoying it.
One thing I'm curious about is the chain slap you mention, you've got the GRX derailleur on there which should have a clutch and as such eliminate or minimise chain slap. My SRAM derailleur has a clutch and no matter how rough the ground I've never heard any chain slap at all, which is why I'm surprised to hear your suffering from chain slap with the GRX. I think you can switch the clutch on and off with Shimano derailleurs and was wondering if yours is actually switched on?
I thought similar about the chainslap. The first time it happened you’re absolutely correct that I didn’t have the clutch engaged and rode over some pretty rough ground so (while gutting) it wasn’t a surprise to find the damage.
However, since then I’ve religiously used the clutch yet the damage appears to have slightly worsened (before I taped a bit of old innertube around the chainstay); with what appears to be another chip intersecting one of the originals and a couple of smaller witness marks that have damaged the paint but not resulted in chips.
I agree with your points about the GRX derailleur – trying to replicate slap off the bike by banging it on the ground / trying to push the chain up towards the frame results in it coming nowhere close. The damage is definitely from the chain though, from the spacing of the impact points.
The only other explanation I can think of is that it’s less slap more suck as I do have a habit of shifting both deralleurs at once (when I need to switch chainrings) and am wondering if this could be contributing.
Either way I’m hoping that the belt-and-braces chainstay protector should prevent any more damage!
Last edited: