Callaway Big Bertha B21 Driver Review

The moment you pull the B21 from its headcover, you know this isn't trying to hide what it is. The exposed carbon fiber crown with its distinctive blue weave and chevron alignment aid screams modern technology. The triangular head shape with red pinstriping gives it an aggressive, powerful look that honestly surprised me. Most draw-biased drivers look like they're trying too hard to be "game improvement" clubs.

What really caught my attention was how Callaway managed to conceal the draw bias visually. Despite the internal weighting that promotes a right-to-left ball flight, there's no visible offset at address. When you set this club behind the ball, it looks like a proper driver should, confidence-inspiring without looking like training wheels. The large Bertha-shaped head fills the space behind the ball nicely, and that chevron alignment aid actually helps frame your target line better than I expected.

Let me be clear about something. I've tested a lot of drivers with "A.I. designed" faces, and most of them feel like marketing fluff. The Flash Face SS21 in the B21 is different. During my testing sessions, I was consistently seeing ball speeds around 158 mph, which is about 3-4 mph faster than my gamer driver (and I play a pretty hot-faced TaylorMade SIM2).

But here's where it gets interesting: the forgiveness across the face is unlike anything I've experienced in a draw-biased driver. Usually, these clubs sacrifice ball speed on toe hits to promote that draw spin. Not the B21. I deliberately hit balls all over the face, heel, toe, high, low, and the speed retention was extraordinary. My worst toe strike still carried 251 yards, only 15 yards short of my best center strike at 266 yards.

The face technology works in tandem with the Jailbreak bars (those two internal bars that connect the crown and sole) to create what Callaway calls a "speed frame." In practice, what this means is that even when you catch one thin or toward the heel, those shots that usually plummet left and come up 30 yards short, you're still getting respectable distance. I had one particularly ugly swing where I hit it so far toward the heel I thought it might shank, and it still carried 242 yards with a gentle draw. That's the kind of forgiveness that keeps you in play when your swing gets loose.

This is where the B21 earns its stripes. Callaway has positioned weight internally to create what they call "draw bias weighting," and unlike some competitors who just stick a weight in the heel and call it a day, this is a more sophisticated approach. The weight is distributed to promote a square-to-closed face at impact without making the club feel heel-heavy during the swing.

During my range sessions, I intentionally tried to hit my old bad shot, that weak fade that starts right and keeps going. It was almost impossible. Even with my most open-faced delivery, the ball would start right but actually curve back toward the target. On well-struck shots with a neutral swing, I was seeing a consistent 5-10 yard draw that felt completely natural, not forced.

The real test came in the course. I have a nemesis hole at my home track, a dogleg left with OB right that I usually aim 30 yards left and pray. With the B21, I aimed straight at the corner and watched the ball draw perfectly around it. Three rounds, three fairways hit. That's never happened before with any driver I've tested. The draw bias isn't so extreme that you can't hit a fade when you need one (I managed a few), but you really have to work for it.

Callaway's decision to push the center of gravity extremely low and forward in the B21 initially had me concerned. Forward CG typically means lower spin, and for a lot of amateur golfers (myself included), we need that spin to keep the ball in the air. But paired with the 10.5° loft setting I tested, the results were impressive.

My launch angle averaged right around 16 degrees with the B21, which is about 2 degrees higher than my normal driver. The peak height of 46 yards meant the ball was getting up quickly and staying there. Yes, my spin rates were higher than ideal at 2,660 rpm (tour pros aim for around 2,000 rpm), but for my 95 mph swing speed, this actually worked perfectly. The ball would climb, reach that peak height, then just hang there before gently descending. No ballooning, no falling out of the sky.

The forward CG also contributes to that explosive feel at impact. When you catch one pure, there's this distinct "crack" sound, and the ball just jumps off the face. It's not the muted feel of some carbon-faced drivers; this has a proper, satisfying impact sensation that lets you know immediately when you've nutted one. On mishits, the feel is still solid, just slightly less explosive, which actually helps with feedback. This combination of forward and low CG positioning delivers the promised high launch, low spin flight that maximizes distance for moderate swing speed players.

I'll be honest. I usually don't mess with adjustable hosels much. Set it and forget it is my philosophy. But the Optifit system on the B21 is simple enough that even I found myself experimenting. With settings of -1, 0, +1, and +2 degrees, you get a 3-degree range of loft adjustment, which also slightly affects the lie angle.

Starting in the standard position with the 10.5° head, I was launching it well, but wanted to see if I could bring the spin down. Moving to the -1 setting (effectively 9.5°) dropped my spin to about 2,400 rpm and added about 8 yards of total distance, though I lost a bit of that helpful draw bias. The +1 setting (11.5°) increased the draw bias noticeably but ballooned my spin over 2,800 rpm.

What I appreciated most was how the adjustments actually made meaningful differences. This isn't one of those systems where you need a launch monitor to detect the changes. You can feel and see the difference in ball flight immediately, which makes it useful for modifying to course conditions or when your swing changes throughout the season.

Absolutely, while the Callaway Big Bertha B21 Driver is a great product, there are a few pros and cons that you need to be aware of:

Pros:

• Legitimate slice correction that doesn't sacrifice distance, the internal draw weighting actually works as advertised.

• Exceptional forgiveness across the entire face thanks to Flash Face SS21 technology

• Premium Mavrik-level tech at a more accessible price point

Cons: 

• Higher spin rates might rob longer hitters of maximum distance.

• The draw bias is always there – you can't turn it off when you don't need it.

• The lightweight 55g stock shaft won't suit everyone (though it does contribute to the easy-to-swing feel)