Very nicely done! Honestly, this challenge is usually an opportunity for me to smack students in the back of the head for forgetting about the textural principles from Lesson 2, but you've clearly held to them throughout this entire challenge, and I am frankly impressed.

As a whole, I'm pleased with both the way you've handled most of your tire tread textures, as well as the core constructions themselves. The only issue in regards to the constructions that does catch my eye is the fact that there appears to be little to no shift both in degree and in overall scale from one end of a wheel to the other. Now, this is understandable - you mentioned yourself that the range on your ellipse guides is quite limited. I imagine you picked up one of the master ellipse templates, which are definitely not ideal, but are reasonably workable for our purposes throughout this course (and a lot cheaper than picking up an entire set of ellipse guides).

Alongside the core construction and the tire tread texture, you've largely done a pretty great job with the variety of complex rims. You tackled the relatively thin widths of the spokes quite nicely, maintaining consistent scale in most areas. There were definitely a few that got a bit messed up (17 was notable, although some of the spokes get a little too skinny in 16), but you didn't lose your cool with those mistakes. The best way to handle those situations is to just keep moving forward like it was intentional, and avoid trying to correct things. It's good to see that you held to that.

Honestly, I have nothing else to call out! As a whole you've shown that you've taken the principles from previous lessons to heart. So, I'll go ahead and mark this challenge as complete.