This is the rear wheel. The Bonneville has a smaller diameter axle than the Tiger 800. The Tiger bearing is replaced with a Bonneville bearing. Both bearings have the same OD and width. This is the brake side.
The other picture shows the bearing spacer and sprocket side bearing. The front wheel bearing spacer was made from aluminum alloy 6061-T651 having a 31,200 psi tensile yield strength. The rear axle is under more tension and it carries heavier loads. Alloy 2024-T351 with a 47,000 psi tensile yield strength was used for this more highly stressed part. This alloy has poor corrosion resistance so it would be OK for a protected internal piece like this spacer. It would not be used for an external part.
The part is in compression so the tensile yield strength is not valid except for comparing metals. Often this is the only data we have so it is frequently used. The bearing yield strength is published for the 2020-T351. This compressive yield is 64,000 psi. It is much higher than the tensile yield. It is a safe assumption to use tensile yield in compressed part design, but not the other way.