Very precise and touchy routing for this one.

Going just a touch slower than possible at the opening puts you into the best timing for the earliest viable cycle of the level. Landing the rear-right truck on the second platform without losing all your speed takes a bit of finesse with the space bar. And targeting the truck mid-fall lets off the strafe for a moment so as not to overshoot.

Then it's all about hard, flat speed for the 2 jumps beneath the rotating cogs. You need get real low and generate enough velocity to clear the first pipe and land the right truck on the platform below.

Then, over the second pipe with a short-hop and seamlessly into a careful grind of the middle truck to setup a max-boost megajump. Even with max height and speed the megajump won't completely clear the final building, so think thin and slip through the gap between building and path on the left.

Finally, grind into the (invisible) solid hitbox of the rotating gear; get smacked by it multiple times to generate forward speed; and be ready to fade right if you don't have the height to clear the roofline ahead!

This routing can definitely be taken sub-21 with better delivery and a bit of luck coming off the gear that throws you to goal.