Listen, if you’ve spent any time around a Tour truck, you know that the distance between a “good” driver fitting and a “legendary” one is measured in fractions of a millimeter… and a whole lot of sweat. I recently sat down with TaylorMade’s Senior Tour Manager, Adrian Rietveld, for an episode of Tour Validated, and what he broke down regarding Rory McIlroy’s transition into the Qi4D is the kind of gear-head gold that keeps me up at night.
Rietveld, a.k.a. AD, has been a close buddy since my days back at WRX, and watching his evolution from a new U.S. hire coming over from the DP World Tour to the Alpha fitter on the TaylorMade truck has been one of my proudest things to witness in this industry. There’s nothing better than getting those texts early in the season when he’s had a breakthrough with a player or a new piece of tech. The passion and dedication is inspiring; honestly, much of what I know about this game comes from this guy and Callaway’s Kellen Watson. Podcasts like this make me really grateful all over again.
Adrian started peeling back the curtain on the R&D process at The Kingdom. Imagine a robot calibrated specifically to Rory’s delivery: 5 degrees up, high 180s to 190 mph ball speed. That isn’t just a machine; it’s a simulation of a freak of nature.
The stress in the room was palpable. Adrian noted that at those speeds, a face angle discrepancy of just 0.2 degrees, a literal hair’s breadth, would send the ball off the range. It gives you a chilling appreciation for how precise Rory has to be with his own hands. When the robot finally started spitting out that signature Rory flight, Adrian knew they were close. But “close” doesn’t win green jackets.
For years, the “Rory Number” has been 2200 to 2400 RPM of spin. That’s where he owns the air. The challenge with the new Qi4D architecture was tightening the standard deviation without losing the integrity of the flight.
Adrian described a session at The Bears Club where the data was almost unbelievable. We’re talking about 190 mph ball speeds with a spin deviation of maybe 150 RPM over dozens of shots. That is pure, unadulterated consistency. It’s the kind of performance that makes a guy like Rory put down his old gamer and never look back. In fact, Adrian mentioned that once Rory hit the final Qi4D build, he didn’t even pick up his previous driver again.
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One of the coolest nuggets Adrian dropped was about the visual evolution of the club. When they were looking at finished parts at Wentworth, Rory’s caddy, Harry Diamond, made a crucial observation. Harry pointed out that while the earlier prototype was clean, the retail-leaning Qi10 had a distinct top line on the crown.
Rory was looking at both, and Harry, who knows Rory’s eye better than anyone, helped bridge that gap. Adrian realized it was easy to just bring both versions to The Bears Club for the final showdown. Having Harry involved isn’t just about carrying the bag; it’s about that second set of eyes that ensures the player isn’t just seeing good numbers, but seeing a look that inspires total confidence.
This isn’t an off-the-rack build. Every gram and every quarter-inch was debated. Here is the full breakdown of the big stick Rory used to conquer Augusta:
Beyond the nuts and bolts of one driver, you have to look at the run Rietveld has been on with TaylorMade. It’s unprecedented. We’re talking about a guy who has managed the bags of the top three players in the world simultaneously, a “Fitter’s Triple Crown” that most in the industry can only dream of.
His track record isn’t just about longevity; it’s about stability. Adrian has overseen a period where TaylorMade athletes have captured seven of the last nine Masters titles. Whether it’s Scottie Scheffler’s unmatched ball-striking, Tommy Fleetwood’s unique iron requirements, or Rory’s pursuit of the career Grand Slam, Adrian is the common denominator. He has transitioned from a “driver specialist” into a master of the entire bag, proving that the secret sauce at TaylorMade isn’t just the carbon, it’s also the people who know how to tune it.
What I love about Adrian is that he isn’t just a “numbers guy.” He takes this personally. He talked about the stress of the “Masters pursuit” and the 10 years of work leading up to Rory’s recent success.
You can have all the robots and Trackman data in the world, but at the end of the day, it’s about a player looking down at a piece of carbon and feeling like he was “born with a driver in his hand.” Rory’s specific Qi4D setup, with that grey face and the top line Harry helped dial in, was a collaborative build that started as a shell at East Lake and ended with a green jacket.
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