I notice this all the time. People put mini gears and stuff like that on there axle but yet put heavy lock collars on both side of bearings and double locking bug hubs. I have the bolt that goes through the axle and threads into the bearing on each side.axle spacers!!!! if you want to be cool. lock collars are so 90s .
https://www.pmckart.com/catalog/p-100717/axle-spacers-1-14-id
people run mini gears then put on 4 lock colors and giant hubs
yes people use carbon in the wrong way all the time. it's the new 'Titanium'. boeing can't even keep their planes together lolAs an FYI on a carbon-fiber sleeve (made from bias weave, like the one in the photo)....
That will have about 1/10th the compressive strength of a steel spacer with the same dimensions. Even aluminum will have about 4x the compressive strength of the carbon part.
Whether in tension or compression, unidirectional fibers that are in-line with the force are the best bet, if carbon is the "solution of choice".
PM
As an FYI, the carbon-fiber sleeves in the photo work FANTASTIC, very light, look great and hubs NEVER slide and the axle looks like new under the sleeves after a season of sprint racing. I have no affiliation with the manufacturer of the sleeves, have used them on 2 very demanding sprint chassis and am thrilled with their flawless performance.