IRONS
#4-9, PW, AW /// RH
#5-9, PW /// LH
CUSTOM LENGTH ASSEMBLY
/ / / DESIGNED TO ALLOW A WIDER RANGE OF CUSTOM LENGTH FITTING CAPABILITY FOR CLUBMAKERS
- 989CLA *Custom Length Assembly) means lighter specification head weight combined with new rear cavity twin weight bores to achieve normal swingweight/MOI assembly at custom lengths.
- Progressive blade height from semi-shallow in the #4, 5 to taller in the wedges keeps the CG lower in the low loft heads while raising the CG in the high loft irons to enable higher flight with the lower lofts and no ballooning flight with the high loft irons.
- Modern loft design to compare with other modern strong loft iron designs.
- Deep undercut back cavity design to increase MOI and off-centre hit performance with low 2mm offset on each iron in the set.
- Outstanding sole design with beveled leading and trailing edge design, ideal for all types of grass and turf conditions.
- Available in RH in #4, 5, 6, 7, 8, 9, PW and AW, in bright mirror polish finish with silicon bead blast highlights and medallion cover for rear twin weight bores.
SPECIFICATIONS
Head Material: Investment cast 431 one-piece stainless steel construction
Ferrule Required: Yes, #121-IR for 13.2mm Top Hosel OD
Scorelines: U-groove 0.8mm wide x 2.8mm spacing x 0.45 deep
Loft/Lie Bending: +/-3º in any direction
Weight Bores: 1) Hosel Weight Bore, capy 9g;
2) Rear Twin Weight Bores, both capacity 2 x 6g;
3) Total Weight addition capability 21g for each head
Hosel Length/Bore Diameter/Bore Depth:
65mm/9.45mm (0.372″)/35mm
Sole Width at T/C/H:
#4 iron – 21mm/20mm/15mm
#7 iron – 22mm/21mm/16mm
PW – 22.5mm/21.5mm/16mm
Toe/Heel Leading Radius:
250mm for all irons and wedges
Face To Back Sole Radius:
#4-9 – 60mm/60mm/50mm
PW-AW – 70mm/70mm/60mm
Bottom of Bore to Ground: 1.5″ (38mm)
/ / / TWIN WEIGHT BORE CAPACITY
For added custom length fitting capability
/ / / LEFT HAND AVAILABLE
Would you mind explaining the stepped thickness behind the face?
If for weight, why not just do thin face all the way down the back and fill in the lost weight in the weight bores?
Also, what’re your thoughts on the trampoline effect? Marketing gimmick?
My thinking is with weight low, centered and off the face you could reproduce a hybrid with the look of a cavity back iron.
Thanks!
Andy Always happy to help because this is one of the least understood scientific aspects of clubhead design. In fact, the entire term “spring face” that even the USGA uses is very misleading. “Trampoline effect” is even worse because these terms convey the impression that as the face flexes at impact, it is the unflexing that propels the ball forward at higher speeds. That is NOT how a thin face/high COR face clubhead works. Let me explain. In the normal collision between the ball and a normal thicker face, there is a fair amount of energy loss. 80% of that… Read more »
I find it odd noone has commented here. Tom! Tell me a bit about these irons. The weight bores to adjust swing weight are absolutely fantastic! I’ve done a set of your irons before with just the hosel ports and those were wonderful. What can you tell me about these? Would you classify these as game improvement? Looking forward to hearing from you and about these beauties!
Ps gotta say it again I really LOVE the weight bores to adjust the swing weight. It baffles me that more people haven’t realized how helpful this is.
ZACH Thanks for the kind comments on the 989 irons. I’ve tried to get more weight addition capability on many of the new clubhead models over the past few years so it can allow clubmakers to pursue a wider range of length and swingweight options in their fitting. Doing that on irons is a little more restrictive than on woods and hybrids but it is nice that the 989 allows a lot more weight capabiity. The 989 is a common deep cavity back one piece iron that would be classified as a game improvement model. Not super game improvement because… Read more »