Mounting a very low-profile tire on a one-off billet wheel is not routine tire-shop work. With a 245/25R22, the sidewall gives very little, so the bead has to be worked into the drop center of the wheel to create enough clearance to roll over the rim. On these custom SPARC wheels, that job gets harder because the machined contours, exposed tool paths, and spoke features leave almost no margin for contact. The whole process comes down to lubrication, bead control, patience, and protecting the wheel while the tire is guided into the drop seat and onto the bead seat cleanly. That matters here because each wheel started as a 500-pound billet and finished at 43 pounds, with extensive machining detail that cannot be casually replaced if it gets damaged.
The video takes place at BBI Auto Sport in Huntington Beach, California, where the Banks team visits Tim, one of the few technicians they trust to mount and balance a one-off set of Spark wheels. The setting underscores the level of precision involved: BBI regularly handles exotic hardware, including McLaren wheels, carbon-fiber wheels from Carbon Revolution, and magnesium wheels expensive enough to exceed the value of an ordinary daily driver. The shop is surrounded by high-end Porsches and race-oriented machinery, so the decision to bring these custom wheels there reflects the rarity and risk of the job.
Tim explains that despite BBI's reputation for Porsche and motorsport work, there is a natural overlap with the diesel world. His own daily driver is a Chevrolet 2500 powered by a diesel engine and fitted with Banks parts. In his view, the connection is straightforward: whether the platform is a 911, a McLaren, a truck, a hauler, or a motorhome, the work is fundamentally the same. Builders start with what the factory produced, then tailor it to the owner's needs and performance goals. He notes that many of his clients rely on diesel trucks to get race cars to the track, and those trucks often prove more dependable than the race cars themselves. That common enthusiast mindset is why the collaboration with Banks feels natural rather than unusual.
The wheel-and-tire package being mounted is unusually demanding. The wheels are 22-inch one-off Spark pieces, paired with 245/25R22 Nitto tires. Tim immediately points out the challenge: with a 25-series tire, the sidewall offers almost no compliance, so the tire does not flex much during mounting. On a normal tire with more sidewall, he would typically lubricate only the beads, but in this case he applies lubricant more generously to the bead seats on the wheel and even onto part of the barrel to help the tire slide into place and seal properly.
He uses a mounting lubricant called Euro Paste, which he describes as the modern equivalent of what technicians used to casually call soap. Its purpose is not only to help the tire slip over the bead and into the seat, but also to aid sealing once it dries after a few hours. Because of the tire's extremely low profile and the wheel's delicate machined features, Tim rates the difficulty of this job at the top of his scale: if a Camry is a zero, this setup is a ten.
Tim then explains the geometry that makes tire mounting possible. The tire bead has a fixed diameter, so to get it over the larger outer diameter of the wheel, part of the tire must be pushed down into the wheel's drop seat. That recessed area effectively reduces the working diameter enough for the opposite side of the bead to stretch over the rim. On these wheels, however, the process is complicated by the wheel's sculpted surfaces and exposed machined details. He is concerned that as the tire rolls over the rim, it could catch on one of those features and either resist movement or risk damaging the finish.
That concern is heightened by the fact that these are not ordinary production wheels. They are visually intricate, heavily machined, and clearly expensive to replace. Tim emphasizes that patience matters more than force. The tire has to be guided so the bead drops into the recessed channel at exactly the right time, allowing the rest of the bead to walk over the rim without scraping the wheel.
Before mounting proceeds, the discussion turns to valve stem clearance relative to the brake caliper. Earlier testing had been done with a set of Black Rhino 20-inch wheels, and the clearance between the caliper and the inside of the barrel was only about the thickness of a business card. A credit card would not fit. Because the final wheels are 22-inch units, the team expects only about one additional inch of radius compared with the 20-inch test wheel, assuming the barrel shape follows the typical profile used by wheel manufacturers.
They measure the valve stem from the seat to the top of the cap at roughly 0.720 inch, essentially about three-quarters of an inch. Using the earlier business-card reference of about 0.050 inch, they estimate total occupied space at around 0.800 inch. That still leaves less than a quarter inch of clearance to the caliper, but Tim considers that a substantial amount of room in this context. The conclusion is that the valve stem package should clear the brakes comfortably enough for use.
The tire itself is directional, and the orientation matters not only for tread direction but also for the wheel's aerodynamic design. As discussed during the mounting process, the wheel's fan-like features are intended to extract hot air outward as the wheel rotates, rather than scoop air inward. With the tire correctly oriented, Tim begins the mounting sequence carefully, trying to avoid contact between the machine head and the wheel.
As the machine starts to rotate, he watches for the critical moment when the bead drops into the wheel's drop seat. He points out the visible gap and explains that if everything works correctly, that gap should close as the bead falls beneath the bead seat and into the recessed channel. At first, the tire is so tight that the wheel wants to spin more than the tire itself, showing how much force is involved. He adds more lubricant under the bead, then backs off slightly to relieve tension and let the tire reposition. The most nerve-racking point is where the bead must pass over a bridge-like section of the wheel without catching.
By working slowly and adjusting tension rather than forcing the tire, he eventually gets the bead to move in the right direction. The tire finally slips over the rim and seats successfully, with the critical section ending up hidden behind a spoke. The result is exactly what he wanted to see: the tire is mounted cleanly without scratching the wheel.
Once the tire is on, attention shifts to the wheel's construction. Unlike many wheels that begin as forgings and are then machined, these Spark wheels started as solid billet material. The owner explains that four billets were purchased and sent to Tyler, Texas for machining. Each wheel began as a 500-pound block and ended as a finished wheel weighing 43 pounds. That transformation highlights both the amount of material removed and the machining time required to produce the final form.
With the tire mounted, the fit between the rim edge protector, the tire bead, and the wheel's outer contour is especially striking. The taper and tuck of the tire against the wheel look precise and intentional, reinforcing that the tire size and wheel design work together visually as well as mechanically.
The final portion of the video becomes an appreciation of the wheel as an engineered object. Tim studies the wheel's surfaces and explains why it is so visually compelling. He traces the radii and contour transitions, noting how lines begin at one feature, continue through the spoke, develop into edges and lips, then disappear and re-emerge elsewhere in the design. The wheel rewards close inspection because every surface appears purposeful. He describes it as being like an onion: the longer you look, the more layers of detail you discover.
Particular attention is given to the consistency of the tool paths and the way they flow down the spokes, into the lug pockets, and around tapered surfaces while maintaining coherent radii. He also points out aerodynamic shaping in the spoke sections, describing one area as a proper wing chord with a thick leading body that radiuses outward and then tapers cleanly toward the trailing edge. Those forms are not random decoration; they are integrated into the wheel's overall structure and airflow intent.
The craftsmanship is credited to Jonathan at Spark, who is described as both an artist and a designer with an ArtCenter Pasadena background. His experience making steering wheels and one-off wheels shows in the execution. For Tim, what makes the wheel exceptional is not just the headline fact that it was machined from billet, but the discipline behind every radius, taper, and tool path. The wheel is presented not as a flashy accessory, but as a deeply considered piece of design and machining.