I have canyon endurace cf sl 7.0 size XS and I’ve put 2x1mm of these: https://www.bike24.com/p2219963.html
no spacers would rub, 1mm would be just barely enough, so I went with 2mm to have some clearance and all works great.
Don’t forget to adjust your cleats after you put spacers on
Late to the party here. I bought one in 2020. Great deal, £180 delivered. Its on winter bike, giant propel. Not used very often, but I was replacing the battery and I discovered how much more prominent the 4iiii crank was vs the normal. So I assume this came pre installed in factory.
I changed the bb a few months ago and I was able to knock this spacer off. Upon seeing this thread I shat myself. But it’s not even close on my giant, I assume it’s only on certain bikes.