Sub 70 639 CB Irons
In a short period of time, Sub 70 Golf has established a quick and impressive cult following in the golf world. At the start of the year, I was fortunate to spend some time at Sub 70 HQ where I got to hit all of the irons, including the [at the time] yet-to-be-released 699 Pro irons. While the 699 and 699 Pro seem to be the biggest fan favorites, one iron jumped out at me as the clear best in class. That iron was the Sub 70 639 CB, a slick forged iron with a compact profile, player’s workability, and added forgiveness.
The Looks
The Sub 70 639 CB irons are available in two finishes. Pictured here is the black finish which looks great, but like most black finishes, it will wear over time. So start working on those dime-sized wear spots like Tiger! The other finish is a traditional satin chrome finish. Frankly, you really can’t go wrong with either one. Both have player’s looks with a compact profile and smaller topline. Branding is minimal with a small Sub 70 logo toward the toe and the model number toward the heel. Milling in the cavity goes from straight lines higher on the face to milling marks on the cavity weighting.
How Does it Feel?
Pure, crisp, smooth, and responsive. Those were the immediate thoughts that came to mind when I hit the Sub 70 639 CB for the first time. About two months passed until I hit them again and the experience was exactly the same. The perimeter weighting of the head helps stabilize the club while the extra weight placed in the cavity helps expand the sweet spot for a smoother strike. Sub 70 also rounded the leading edge and sole which makes the club feel a little more forgiving through the turf.
Feel is the first area where the impressive value of the 639 CB really starts to shine through. When you hit this club, you’ll find it feels as good as any forged cavity blade from the major manufacturers. I’ll be honest, in some cases I think the 639 feels even better. When you consider how good this iron feels and that a 4-PW set comes in at only $595, it’s tough not to be impressed.
How Does it Sound?
The sound of the Sub 70 639 CB follows suit with the pure and crisp feel. Taking a nice thin dollar-sized divot from the fairway gives you a pleasant “ripping” sound as the club interacts with the turf. The somewhat generous face has a nice blend of “crack” and “whap” tones to it. The closer you are to the center of the face, the more solid that forged “crack” tone will be letting you know you just pured your shot.
On-Course Performance
Listen, the Sub 70 639 CB irons aren’t designed to be some fancy, bells and whistles golf club. They are designed to allow a shotmaker to have premium control in all of their shots with a little extra forgiveness and sweeter feel. And you know what? That’s exactly what they do. Standing over the 639 CB, you’re looking at every bit of a blade iron that will allow you to shape and flight your shot any way you choose. As mentioned earlier, the rounded leading edge helps a little extra through the turf and the cavity back gives you a little extra room on the face to still hit a good shot. It’s also worth noting that for a better player’s club, the 639 CB is very easy to launch and get airborne.
Final Thoughts – Sub 70 639 CB Irons
In the cavity back blade category, the Sub 70 639 CB honestly performs just as well, if not better, than many of its premium competitors with four-digit price tags. They are extremely easy to launch and maneuver with impressively pure feel, and are just overall crisp as hell. When I first hit these irons so many months ago, I was extremely impressed with how legitimately good they were for a forged set of irons coming in under $600. Following my testing of the 639 CB irons, I’m still just as impressed as I was then. Hats off, Sub 70, these clubs are tremendous.
Stock Sub 70 639 CB Irons Specs
| Club # | 3 | 4 | 5 | 6 | 7 | 8 | 9 | PW |
|---|---|---|---|---|---|---|---|---|
| Loft º | 20º | 22º | 25º | 28º | 32º | 36º | 40º | 44º |
| Lie º | 59.5º | 60º | 60.5º | 61º | 61.5º | 62º | 62.5º | 63º |
| Length | 39″ | 38.5″ | 38″ | 37.5″ | 37″ | 36.5″ | 36″ | 35.75″ |
Great review Bill. I’ve followed your reviews since you were at Plugged In Golf. I currently play Mizuno MP58’s with Project X 6.5, shows how long ago I was fitted! I’ve been researching the direct to consumer line, Hogan, Sub 70, and New Level. I’ve narrowed it down to either Sub 70 or New Level. Can you offer any insight or comparison? Thanks!
Thanks for the ongoing support! I hope you find yourself here on a regular basis!
I’m a big supporter of what’s going on at S70 for a variety of reasons. Shoot me an email (bill@drivingrangeheroes.com) if you want to discuss further. Happy to do so.
Thank you sir I will take you up on that! I read the reviews here regularly. Your review on the old Cobra Bio Cell+ prompted me to get a driver fitting and it was in the bag until last month. What replaced it? The Tour Edge EXS 220.
I’ve been in the Cobra SZ this season. Haven’t had the BC+ in my bag in ages.
Are the sole on these similar to Srixon and Hogan, v-sole like? it kind of looks like it in the pictures. I may have to try their demo program with these
I can’t speak for any Hogans after 1973 as I’ve never had any close interactions with them, but no, these aren’t like the Srixon VT soles with a pronounced V shape.
What is your opinion on 699pro vs 639 CB for a 10 handicapper? I have a bit of an outside in swing path that I am working on getting more inside out. My misses are generally left (pull, not hook or draw). Thank you.
That’s not really enough info to make a suggestion on, but I’d say the 639 is more blade and the 699 Pro has more forgiveness built into it. Hopefully that helps give you a better idea of what you need.
Thank you for the review. After reading, I’ve demo’d a 6i and 9i of the 639 CB and totally agree with how easy they were to hit. I’m an 18 HC (used to be a 10 HC and trending that way again after more practice and play) and was worried that the 6i may be a little intimidating and difficult to launch. Even with a demo club with stock shaft, the 6i was launching well and flying almost as far as my Callaway Steelhead Pro 6i.
Contemplating a combo set with 4i-5i 699 Pro, 6i-Pw 659 CB (newer version of the 639 CB). The Sub 70 659 CB 6i-Pw with customized specs is over $300 cheaper than stock Callaway Apex, which I also demo’d and found no real difference in feel, flight and distance to the 639 CB demos. The cost savings alone (plus the fact that you get the grips, shaft and other specs you want) is just too good to pass up.