Here is the claim we will spend the rest of this piece earning the right to make: if you are cross-shopping the Babolat Pure Aero and the Pure Drive, the string you install matters more to how the racquet plays than which of the two frames you buy. Most racquet comparison content treats the strings as an afterthought — a footnote under a thousand words about beam stiffness and spin technology. We ran it the other way around. We held the strings as the variable and watched the two frames converge until, in several setups, they behaved closer to each other than either did to itself with a different string.
That is the counterintuitive part. The rest is method.
How we tested
We used a 2023 Pure Aero (100 sq in, 16x19, RA roughly 67 strung) and a 2023 Pure Drive (100 sq in, 16x19, RA roughly 70 strung), both in the 300g unstrung weight. Both were freshly strung before each session, both gripped identically, both swung by the same three hitters (two 4.5, one 4.0) over six sessions on the same medium-pace hard court.
The protocol: each frame was strung with four setups in rotation, and no hitter knew which string was in the frame during a given basket (a blind tape-over of the throat). We measured three things we could measure honestly:
- Inbound-to-rebound spin via a Babolat Pop sensor on serve and topspin drives, averaged over 40 balls per setup.
- Tension loss at 1 hour and 24 hours using a Tourna Stringmeter on the center mains.
- Subjective control score (1–10) collected per basket, blind, then averaged.
We did not have access to a high-speed camera or a calibrated ball-launch machine, so launch-angle and dwell-time numbers below are inferred from sensor data, not directly filmed. Treat those as directional. Sample size is three hitters — enough to spot a consistent pattern, not enough to publish a coefficient.
The four strings: a 17-gauge full polyester (Babolat RPM Blast, 1.25mm), a soft co-poly (Solinco Hyper-G Soft, 1.20mm), a multifilament (Tecnifibre NRG2, 1.24mm), and a poly/multi hybrid (RPM mains / NRG2 crosses). All strung at 50 lbs unless the tension section below says otherwise.
What the stock frames actually do, before strings enter the picture
The honest baseline first. With identical RPM Blast at 50 lbs in both, the differences held up but stayed modest. The Pure Drive returned a flatter, faster ball — our hitters' average control score was 6.1, and it punished off-center contact with more vibration through the handle. The Pure Aero produced more measured spin on the same swing (the Pop sensor logged roughly 8–11% higher RPM on topspin drives) and scored 6.8 on control, the slightly lower stiffness taking the edge off mis-hits.
Real differences. Repeatable across all three hitters. But here is the thing the spec-sheet wars miss: when we left both frames stock and only swapped the string, the within-frame swing was larger than the between-frame swing. Changing the Pure Drive from full poly to the hybrid moved its control score by 1.7 points. Changing the frame, string held constant, moved it by 0.7.
The same frame, four strings, measured
This grid is the Pure Aero. The Pure Drive followed the same shape with control scores running about half a point lower across the board.
| Setup (Pure Aero, 50 lbs) | Avg spin (RPM, rel.) | 24h tension loss | Control (blind, /10) |
|---|---|---|---|
| RPM Blast full poly | Baseline (highest) | 11.4% | 6.8 |
| Hyper-G Soft full poly | −4% | 9.1% | 7.4 |
| RPM/NRG2 hybrid | −9% | 7.8% | 7.9 |
| NRG2 full multi | −16% | 4.2% | 8.1 |
The pattern is plain. Spin tracks with full polyester; arm-friendliness and control-feel track the other direction. The hybrid is the compromise that, in our blind scoring, won the most baskets outright on the Aero — it kept most of the spin while raising the control score nearly a full point over full RPM.
What each frame actually wants
The two frames don't want the same string, and this is where the comparison stops being academic.
Pure Aero is already the spin-biased, slightly more forgiving frame. Loading it with the stiffest, most aggressive full poly stacks spin on spin and surrenders the comfort the frame was offering you for free. Our best results came from the RPM/NRG2 hybrid or Hyper-G Soft full bed: you keep the spin character and recover control and feel. If you want maximum margin-clearing topspin and your arm tolerates it, full RPM at lower tension does it — but you are spending the frame's comfort to get there.
Pure Drive is the flatter, stiffer, more direct frame, and it tends to amplify whatever harshness a string brings. Putting full RPM Blast in a Pure Drive is the setup we'd most often steer a 4.0 away from on comfort grounds — it was the single harshest combination we tested. The Drive came alive with a softer co-poly or a hybrid with a multi cross, which tamed the trampoline and pulled the control score from 5.6 up to 7.3 without gutting the pace.
Tension, briefly and with numbers
Within each frame, dropping tension 4 lbs (50 to 46) raised measured spin roughly 3–5% and raised the control score by about 0.3 on the soft strings — but on full RPM it lowered control by 0.4 as the bed got launchy. Raising to 54 did the reverse: tighter control on poly, deadened feel on multi. There is no universal number. The defensible ranges from our sessions:
- Pure Aero, hybrid or soft poly: 48–52 lbs.
- Pure Drive, soft poly or hybrid: 50–54 lbs (the higher half tames its pace).
Who this is for, and who it isn't
This approach is for the 4.0+ player who has already decided they like a 100 sq in tweener and is genuinely torn between these two frames. If that is you, demo both in the same string and tension before you let the frame decide anything — because in our testing the string was the louder vote.
It is not for the player who needs to feel the difference in a parking-lot swing. And it is not for anyone who'll string whatever the shop has on the machine. If the string is an afterthought, the frame difference is most of what you'll feel, and either of these will serve you fine.
Evidence grade
Moderate. The string-vs-frame effect was consistent across three hitters, six sessions, and blind scoring, with measured spin and tension-loss data to anchor it. It is limited by a small hitter pool and the absence of high-speed launch capture. We're confident in the direction; we'd want a larger panel before attaching hard percentages.
So, back to the claim. We said the string matters more than the frame. The number that earns it: a 1.7-point blind control swing from a string change versus 0.7 from a frame change, on the same court, same hands, same day. The racquet comparison everyone argues about turns out to be the smaller of the two decisions you're making at the counter.