Inside Tomac's KTM:
The Cable Clutch, the
Austrian Sessions, and
the Bike Nobody Else Gets

Every KTM in the paddock runs the same hydraulic clutch. Every one of them — from Tomac's teammates at Star Racing to the privateers scraping together sponsorship dollars on the AMA circuit. The 450 SX-F ships with it standard, KTM engineered it that way, and for the last six years, it's been the industry standard because it works. Hydraulic clutches require less maintenance, demand less hand strength, and give predictable engagement across temperature and humidity swings.

Except Tomac. He demanded a cable clutch — the same setup he ran on his Yamaha since 2022, the same setup he learned on in his formative years at the 125cc level, the same setup that, in his assessment, gives a rider something hydraulic systems cannot: tactile feedback. Direct, honest, modulated feel. For three weeks at the 2025 off-season, this single request nearly killed the KTM deal. Because what Tomac was asking for wasn't a swap from the parts bin. It was a complete one-off engineering exercise.

The Cable Clutch Secret

KTM's engineers had to start from zero. Not from a shelved design or a prototype from 2023. From zero. They had to build a cable clutch perch, design a custom lever assembly, route cable through the frame in a way that didn't compromise structural integrity, and then test it through an entire season to make sure the tactile feedback Tomac was chasing actually existed on the orange bike. It took them until the December before the 2026 season to finish it. That's how bespoke this was.

Why does this matter? Because a cable clutch requires something from the rider that a hydraulic system doesn't: constant engagement. Your hand is always in the loop. In the whoops, especially in deteriorating conditions where ruts deepen and loosen throughout a moto, that direct feedback lets a rider modulate traction in ways that hydraulic systems, by design, smooth out. Tomac's argument was straightforward: if you're trying to minimize wheelspin and manage momentum through a section that's getting progressively rougher, you want to feel exactly what the tire is doing at every moment. A cable lets you do that. Hydraulic dampening — even the best versions — distances you from that information.

Everyone in the pits noticed it at Anaheim 1. There was audible surprise when the mechanics wheeled Tomac's bike out and the perch looked wrong. That's because it was completely custom. One factory in Europe built the lever assembly. A different shop handled the perch. The cable routing required three different iterations before it passed safety checks. A cable clutch on a KTM in 2026 is a statement. It says: we built him a completely custom machine. And if they're doing that, what else is different?

Factory Edition vs. the Actual Race Bike

The 2026 KTM 450 SX-F Factory Edition costs approximately $13,000. It's designed to close the gap to factory machinery. It comes with WP XACT PRO 7548 fork and WP XACT PRO 8950 rear shock fitted with Supertrax technology. On paper, it's the closest thing a privateer can buy to what the race teams are running.

Tomac's actual race bike makes the Factory Edition look like a practice bike. It starts with the same basic frame and engine block, sure, but everything else diverges from there. The suspension internals aren't XACT PRO. They're hand-built by WP's top technicians with valve stacks that cost ten times what the production versions cost and are calibrated specifically for the way Tomac rides. Those shock internals change track to track. After Detroit, they don't travel to the next round in their current configuration. They come apart, the shims are swapped, the valving is re-tuned for the specific soil and rhythm of the next venue, and they go back together.

The engine mapping is venue-specific too. Not just different air density settings — every modern bike has that. Engine timing, fuel injection delivery, and ignition curves are built from scratch for each track. Mid-section power characteristics that work at Anaheim don't work at Glendale. The data department works weeks before each round building the code that will run in Tomac's ECU. The Factory Edition has whatever base map comes on the bike. Tomac's bike has custom firmware.

The frame itself has been subtly modified through processes that don't show up in photos. Specific frame tubes have been stress-relieved to alter stiffness characteristics in very specific ways. The swingarm has been geometrically tweaked — not drastically, but enough that it won't bolt onto another bike without confusion. Subframe design is unique to Tomac. Everything down to the radiator shroud material has been selected and tested in ways that the Factory Edition design never was.

The Austria Sessions

Before Tomac signed with KTM, his technical staff spent three days at KTM's facility in Mattighofen, Austria. This wasn't a casual tour. This was access to the 2026 development roadmap, facility time with the race team's top engineers, and data — actual data — about where KTM's bike was headed. What they saw convinced Tomac.

His primary complaint about the Yamaha — the one that nearly cost KTM the deal because Yamaha couldn't promise a solution within a reasonable timeline — was mid-section power delivery in deteriorating whoops. On the YZ450F, in second or third moto conditions where the track has been worked into ruts and the soil has been turned to dust in the high lines, the power comes on too aggressively in the middle of the rev range. It's hard to manage. You need to be precise with throttle input, and when you're tired, precision gets expensive.

In Austria, KTM showed Tomac the data proving that their platform had solved this. The 2026 SX-F's engine management was fundamentally different from the 2025 model. The power curve was flatter in the midrange — more progressive, less aggressive, exactly what Tomac had been asking for. He tested it in limited sessions. The data matched what he felt. That's when the decision was made. That's when the cable clutch conversations began.

MXGP vs. AMA — The Rules Divide

In MXGP, the factory teams from HRC and KTM build motorcycles that barely exist in any parallel universe. Billet engine cases that are sand-cast and then machined to specifications that cost more than an entire production bike. Titanium subframes. Custom-built swingarms that are completely different configurations for sand versus hardpack. Linkage ratios that change track to track. Engine positioning that differs from the production model by millimeters. In MXGP, there are no homologation rules that tether you to a production standard. The bike that wins in the sand is purpose-built for the sand. The bike that wins on hardpack is purpose-built for hardpack.

In AMA, even factory bikes must stay conceptually close to production homologation. The frame geometry, the basic engine case design, the fundamental architecture — it has to be recognizable as a stock machine. But within those constraints, teams still run completely different internal parts. Custom engine cases, different materials, titanium where aluminum is standard. Suspension internals that are hand-built and cost multiples of the production component. Wheel selection varies — teams run DID LT-X rims in supercross because the stiffer wheel is necessary when the bike is running softer suspension. In motocross, where speeds are higher and the track is rougher, they switch to DID ST-X rims because that design is built to absorb more energy.

Tomac's bike sits at the absolute top of the AMA factory ecosystem. It's subject to homologation rules, but everything that can be modified within those rules has been. Everything that can be engineered with custom geometry, custom materials, and custom procedures has been. What started at the dealership with the cable clutch conversation has evolved into a machine that's as purpose-built as anything in motocross gets without crossing into complete billet-case territory.

And so far, it's working. Tomac is running front in the championship. The cable clutch has shown up in whoops sectors where the track is at its worst. The factory-engineered power delivery is delivering in late-moto deteriorating conditions. The data from Austria translated. The engineering that KTM committed to turned out to be the right commitment.

That cable clutch — that one single thing that nearly cost them the deal — might end up being the difference in the championship.