Brandon Dim

“Another Random @DrivelineBB Hitting Coordinator ” | BW Baseball Alum | Try not to suck

[Brandon Dim @BrandonDim24]

How does someone add 7.2 MPH of Bat Speed in 4 months?
Let's dive in ⬇️

[Jacob Hirsh @jhirsh04]

I wonder if this guy just absolutely crushed his off-season training and added a ton of bat speed 😏 @BrandonDim24

[Bay Liskey @bayliskey]

When we want more consistency from a hitter, do we really know what we’re looking for?

In the mocap lab, bat speed was more consistent from swing to swing than the movements that produced it.

Do the best hitters really repeat their mechanics, or is there more to the story?

[Carson Evans @carsonevanss]

Trent Grisham went from a 129 wRC+ in 2025 to a 98 wRC+ in 2026.

Of the Driveline big 3, his Power Grade took the biggest hit, going from a 66 to a 52. His Contact Grade got better and his Swing Decision Grade saw a small tick down.

Let’s take a quick look at what changed for Grisham in 2026 that led to less power output... 🧵

[Brandon Dim @BrandonDim24]

@QUAGZILLAA @GreenfieldMax18 https://t.co/mfRaVE2sLi

[Driveline Baseball @DrivelineBB]

Driveline is hiring Hitting Coaches at all four of our locations.

No better place to accelerate your coaching career than here.

Take a look where some of our hitting alumni have gone ⬇️

[Tomas Nelson @tomashnelson]

Where does this quickness come from?

Keeping the barrel in line with the lead humerus in the frontal plane (umpire view) gets the barrel to contact 13.2 ms quicker, with 27% more early barrel acceleration at the same bat speed

In line = efficient path

#ProjectBows

[Quentin Evers @QuentinEvers]

For hitters who are remote/haven't been in gym for awhile we are also able to detect path anomalies (⬇️) using our full signal Blast Motion visuals.

Just another way that we are able to provide one of the best training experiences in the world for our athletes @DrivelineBB.

[Eric Kozak @kozy_shack]

Today's iPitch for the pro groups: Aaron Ashby

Tried to replicate his Sinker & Curveball with Leather Smash Balls

[Driveline Baseball @DrivelineBB]

Tried changing everything in your swing and still not squaring it up?

You're fixing the wrong thing.

Mechanics are how your body moves the barrel.
Speed is how fast it moves.
Path is where it goes.

Most hitters only train the first one.

[Brandon Dim @BrandonDim24]

@DrivelineBB @AFredericks2027 It’s good to swing fast and swing up in softball too

[Driveline Baseball @DrivelineBB]

.@AFredericks2027 was already hitting .450 with a .702 SLG, 4 triples, and 2 home runs, and committed to Nevada.

But she still wanted more.

After 7 weeks of training at Driveline:
Max EV: 73.2 ➡️ 77.6 mph (+4.4)
Avg EV: 64.0 ➡️ 66.6 mph (+2.6)
Bat Speed: 58.5 ➡️ 60.5 mph (+2.0)
Max Distance: 241 ➡️ 261 ft (+20)

[Dylan Robertson @DylRobertson13]

Been an absolute blast working with Addison. Her willingness to try new things, fail in tough environments, and ask good questions has allowed for some sick jumps in a short period of time.

More gains to be made
@AFredericks2027

[Jack McDonald @JackMbmac]

Alex squats in his load. Once he squats, he can't hold his posture as he moves forward, so there's no connection early in the swing or at contact. The barrel just rips flat and across.

Set-Up
- Oppo angle SL
- Underload bat + Smash Bat

Step Back Pivot Pick
- Loads him into his backside with a hinge instead of a squat
- Teaches him to hold that posture into foot plant
- Keeps him connected early so the barrel doesn't rip flat and across

[Tomas Nelson @tomashnelson]

Quickest and Slowest to the ball in 2026 (300+ swings)

Time to contact = 1.3636 × swing length / bat speed

Swing acceleration = 0.03343 × bat speed² / swing length

What do you see?

[【公式】ドライブライン ベースボール ジャパン Driveline Baseball Japan @DLBB_JP]

⚾️ バットスピードが速ければ、良い打撃ができるのか？

実は、速さだけでは説明できない打撃の違いがあります。

ドライブラインベースボールジャパンの最新noteでは、バットの動きを3次元で分析する「バットパス最適化モデル」を詳しく解説！

📊 インパクト時のデータから18点のバット軌道を推定
📊 パワーとコンタクトのバランスを分析
📊 打者一人ひとりに合った改善方法を探る

鈴木誠也選手やムーキー・ベッツ選手などの分析例に加え、理想の軌道を身につけるためのトレーニング方法も紹介しています。

「速く振る」だけではない、科学的な打撃改善の世界をぜひご覧ください！⚾️

📖 記事はこちら
https://t.co/eSg4TT6TGt

[Bay Liskey @bayliskey]

What I'd take from it as a coach:

The miss should shape the adjustment. Build an environment and assign tasks that challenge the direction of the miss. Lots of variables feed a miss, so mix heights, locations, speeds and pitch types. That's how strategies carry into the game.

[Jack McDonald @JackMbmac]

Top 10 wOBA leaders and the paths that created it.

The paths vary, but the speed doesn't
- 8 of 10 swing faster than league average (71.8 mph)

[Dylan Robertson @DylRobertson13]

Dylan Crews has yet to establish himself in the Bigs

High Whiff and low HH EV LA (8.4° 90th% LA, League Average 12°), have led to production not matching his tools (Which are very LOUD)

A quick look at why and how we'd go about making the adjustment🧵🧵

[Tomas Nelson @tomashnelson]

VAA isn't one number

It changes every inch the barrel travels

Space the three phases 18 in apart along the path:
Current swing spends ~14 in at 9-19 deg

The optimal swing spends ~22 in.

More margin for error!

[Tomas Nelson @tomashnelson]

Braden Montgomery has an awesome lefty swing!

Our bat path optimizer says he needs just 0.60 inches of path change away from 1.29 more Run Value per 100 swings

1.56 runs per 100 swings per inch, #6 of 351 MLB hitters

Small change, big value🧵

[Tomas Nelson @tomashnelson]

Top 3 hitters who open up the most

High ideal attack angle

They swing fast

They hit it hard

These guys rock!

[Jorge Arrate @JArrate25]

Upper body Sequencing and Torso-Bat Relationship:

When the upper body sequences well, the barrel works “behind” the torso. You’ll see it "fall" behind the back shoulder and follow the plane of the shoulders as the torso rotates.

Notice when and where the barrel "falls" behind.