Aerotech Steelfiber i70 Shaft Review – Specs, Flex, Weight

Aerotech Steelfiber i70 Shaft

Everyone knows about the merits of graphite irons shafts: they are great for increasing swing speed and lack a boardy feel.

Likewise we’d bet that most golfers know what steel iron shafts bring to the table: stability and accuracy.

But what the heck are golfers supposed to make of a shaft that is a graphite/steel hybrid? That’s exactly what we found out in our test session with the Aerotech Steelfiber i70 shaft.

In the following review, we will tell you what we experienced from the Aerotech Steelfiber i70 and who it’s for.

Aerotech Steelfiber i70 Shaft Overview

You may be asking how the graphite and steel components are oriented in this shaft.

According to Aerotech, the core of this shaft is made of graphite. Then, they used 59 miles worth of steel fiber for the surface of the Aerotech Steelfiber i70.

At a glance, the Aerotech Steelfiber i70 sort of looks like a steel and graphite shaft at the same time.

We think Aerotech chose a relatively reflective shade of silver for the finish in order to make it look like a steel shaft.

But when you look closer, you can see a grainy pattern that is more indicative of a graphite shaft.

Overall, the shaft looks nice with a lighter silver midsection that houses all the lettering and logos.

The Aerotech Steelfiber i70 is a 74-gram shaft and the nice thing about it is that the weight remains consistent across all four flex offerings.

So whether you choose ladies flex or stiff flex, you will still be swinging a 74-gram shaft.

By far, the most unique thing about this shaft is how it feels. The bend point is somewhere just above the tip section.

And while it feels whippy, it seems to whip back into place very well. You can feel the shaft working with you. The action in the lower midsection contributed to faster club head speeds.

The kick is clear and consistent too. However, the shaft seems to promote an optimal path on release. So while there is a lot of action, the club head moves through the intended swing path.

Why is the Aerotech Steelfiber i70 So Popular?

The Aerotech Steelfiber i70 is a popular shaft because there aren’t very many shafts like it on the market.

Very few companies are investing R&D dollars into hybrid graphite/steel iron shafts. But Aerotech seems to have done a really good job on this shaft.

While it’s very light and very active, it also manages to promote stable flight.

How Does the Aerotech Steelfiber i70 Perform?

It was very easy for our testers to get the feel for this shaft.

While the Aerotech Steelfiber i70 is lighter than what most of us were used to, it was also very easy to swing.

It didn’t take long for our testers to start improving their swing speed and smash factor with the Aerotech Steelfiber i70 shaft.

The Aerotech Steelfiber i70 has a torque rating of 3.0 – 3.5 degrees. So you are going to feel this shaft work. On strong loads, you get a very whippy action.

However, you don’t lose the shaft at any time. The Aerotech Steelfiber i70 allows you to keep the ball straight because it releases straight – even though it kicks like a bucking bronco.

The dispersion was therefore nice and tight. The only thing we weren’t thrilled about was the launch angles. They were very steep and some of our testers lost yardage as a result.

But what else can you expect from a 74-gram iron shaft? Besides, slower swing speed players probably won’t lose any yardage due to the high launch.

Shaft Specs

Specs Aerotech Steelfiber i70
Available flexes Stiff, regular, senior, ladies
Weight 74g
Butt .600”
Tip .370”
Length 41”

What Flexes Are Available? What Swing Speeds Do They Suit?

Ladies and senior flex would be good for players swinging slower than 70 MPH.

Stiff and regular flex may be a good option for players in the 75-85 MPH swing speed range.

What Weights Are Available? What Swing Speeds Do They Suit?

The Aerotech Steelfiber i70 is a 74g shaft.

This is a good weight for slower swingers in the 75-85 MPH swing speed range.

Why is it So Good?

Aerotech Steelfiber i70 Shaft1

The Aerotech Steelfiber i70 is a good shaft for slow swing speed players who want to increase their speed.

Make no mistake about it, the Aerotech Steelfiber i70 feels very fast in the hands and on your downswing.

Plus, the high launch makes it much easier for higher handicap players to stay on the green.

Aerotech Steelfiber i70 First Impressions

Aerotech Steelfiber i70 Shaft2

Right away, the Aerotech Steelfiber i70 felt fast.

Even on practice swings, you can feel how much this shaft wants to kick. It was also surprisingly easy for our testers to find the sweet spot with this shaft.

Key Features & Performance

The Aerotech Steelfiber i70 uses steel fibers on the shaft surface and has a graphite core.

This combination, we think, is what allows the Aerotech Steelfiber i70 to whip back into shape so quickly and keep the club head path straight.

Aerotech Steelfiber i70 Irons Review

You get surprisingly tight dispersion from a shaft that is so active. It’s amazingly stable for its weight too

Aerotech Steelfiber i70 Review

The Aerotech Steelfiber i70 gives you awesome wedge spin and launch. It’s very easy to freeze the ball on elevated greens.

Aerotech Steelfiber i70 Pros & Cons


  • Very light
  • Stable flight
  • Good stopping power
  • Good for slow swingers
  • Constant weight profile


  • Definitely not for fast swingers

Aerotech Steelfiber i70 Shaft

Overall Score: 95/100

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Who Should Buy it?

The Aerotech Steelfiber i70 is strictly for slow swingers.

Pretty much anyone in the 70-80 MPH swing speed range will be able to benefit from this shaft.

It will add distance to your irons and allow you to attack the pin more aggressively.

While shot-shaping takes a hit because of the weight, you still get good dispersion and adequate accuracy.

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