:P I'm Canadian, but you're not far off from Canada Day which was on the 1st.

So! Your work here is actually extremely solid - your constructions are consistently on point, both in terms of the wheel structure (you're not just building a simple cylinder but you are instead building up a series of ellipses to capture the beveling of the wheel form as a whole, which shows excellent attention to detail). You're also doing a great job of building a variety of rims/spokes. There are a few that end up falling a bit by the wayside (#20 seems sketchier and somewhat half-done) but the majority of yours are very thoroughly laid out and demonstrate an excellent attention to detail and structure.

The only issue I want to point out is a minor one - it comes down to precisely how you're trying to imply the presence of the various tread textures along the surface of your tires. You try a number of different strategies, but they all end up relying very heavily on line. For example, if we look at #21, you've outlined each 'chunk' of tread separately - more as a simple 2D shape rather than actual 3D forms, so they end up appearing somewhat more flat. In #19, you've tried to avoid enclosing the tread forms entirely, instead adding lines on certain sides of them - this is definitely a move in the right direction, but still not quite there.

First off, instead of using lines, purposefully use shapes. That is, draw the shapes that these forms cast as shadows on their surrounding surfaces. We can force ourselves to avoid using lines altogether by following this process when putting down marks to capture texture. You purposely enclose an area (even if it's very narrow), then fill it in. Forcing yourself to use two steps will help you break away from the overuse of individual lines.

Secondly, take a look at this diagram. When implying the presence of a given form, don't put ink on the form itself - focus your shadow shape on the surfaces around it, as this is where it will block the light from reaching. Use this as an opportunity to determine the full silhouette of your textural form, where the corners exist to truly capture the entirety of how it sits in 3D space without adding any internal detail or direct separation of your planes. It can definitely be tricky to work this way, since it's more a matter of "less is more" (fewer lines, stronger result), but leaning into it will help you ultimately yield stronger results.

Of course, the whole shapes-not-lines doesn't apply to areas where you're running up against the silhouette of the form (so this stuff on wheel 21 is totally fine).

Aside from that relatively minor point, your work here is coming along great. I'll go ahead and mark this challenge as complete.