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Tennis Lab FX

Swingweight explained.

What the number means, how different ranges feel on court, and where weight placement changes your racquet most.

SW

The spec that actually matters.

Swingweight (SW) measures how heavy a racquet feels in motion — not just how heavy it is sitting on a scale. Two racquets with the same static weight can feel completely different to swing based on where the weight sits along the frame. It's the single most important spec for matching a racquet to a player's game.

Measured in RDC units on a Babolat RDC machine, with the axis of rotation set 10cm from the butt cap. Most stock racquets land between 300 and 330 before customization. Tour players typically end up between 330 and 360 after lead tape, silicone, and grip work.

Covers: what the numbers mean · how ranges feel · what changes swingweight and by how much

Swingweight is adjustable — we customize racquets to specific SW targets using lead tape, silicone, and weight placement. Tell us your current setup and what you're looking for.

Racquet Customization →

Or book a consultation and we'll measure your current setup on the RDC.


What each range feels like.

Select a swingweight range to see the feel, player profile, and example frames that land in that zone.


Where it goes matters most.

Not all weight changes swingweight equally. Select a zone on the racquet schematic to see its impact per gram.

A +1.5 SW/g
B +1.0–1.2 SW/g
C +0.5–0.7 SW/g
D <+0.2 SW/g

Select a zone to see its impact

A — Tip  ·  B — Wings  ·  C — Throat  ·  D — Handle

We run it on the RDC.

Bring in your racquet and we'll measure static weight, balance, and swingweight on the Babolat RDC. If you want to adjust — add weight, move balance, hit a specific SW target — we do that too. Custom specs, validated on the machine.

Swingweight · RDC Measurement300–370 Tour RangeLead Tape · Silicone · Weight PlacementTip · Wings · Throat · HandleBabolat RDC · Custom SpecsSwingweight · RDC Measurement