Driver and shaft fitting you can check.

Enter your launch-monitor numbers. The engine finds the launch, spin and descent window for your speed, scores 21 drivers and 172 shaft weights against it, and shows each step with the code that produced it.

Fit driver + shaft Fit a shaft for the head you play

Free. No account. Also: fit the top of your bag (fairway wood, hybrid, long iron).

Shafts

172 weights from 76 shaft lines, stock and aftermarket. Each one is matched on weight, flex, torque and bend profile against your speed, tempo and spin, and every pick lists the rules it met. Shafts no longer made still rank, tagged so you can search used. How the weight window is set

Club speed	Weight window
under 80 mph	40–55 g
80–89	50–62 g
90–99	55–68 g
100–109	60–72 g
110+	65–80 g

A smooth transition moves the window 5 g lighter; an aggressive one 5 g heavier.

The method

Window. The launch, spin and descent targets for your club speed.
Loft. The loft that fits your speed, attack angle and spin.
Heads. All 21 drivers scored on what your numbers call for.
Shaft. Weight window and flex from speed and tempo; tip and profile from your spin and launch.

The method, with the code

Rules the engine follows

Ranking ignores price, brand and commission. We earn a commission on purchases through our links; it never affects the order.
Ties are shown as ties (3=). Within a tie the order is a shuffle seeded from your numbers, never brand or catalog position.
No predicted yardage gains. You get the window, the scores and the reasons.
The code is licensed AGPL-3.0 and the equipment data CC BY-SA 4.0. Every rule on this site is in the code.