The Mercedes-AMG SL strips down to show off its all-new 270kg chassis

Ready to challenge the 911 Cabrio and the Portofino
by Stephen Dobie | May 20, 2021
PHOTO: Daimler AG

“Excellent rigidity values in all areas in conjunction with a favorable weight.” It’s what we’re all striving for and, swerving a seemingly inevitable lockdown bod, the new Mercedes SL has achieved it.

Strip all the panels, trim, and mechanicals from the brand-new Mercedes-AMG SL, and this naked metal is what you’ll see: a clean-sheet composite aluminum chassis that shares not a single part with the old SL nor AMG’s other droptop, the GT Roadster.

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Yep, you’ve no doubt spotted the key suffix change. AMG is developing the SL rather than Benz, and it’s taking its duties very seriously indeed, channeling the original ’50s 300SL that boasted a ground-up-design space-frame chassis.

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This time around, though, the SL accepts normal doors. Those delightful gullwing doors were a necessity, not an extravagance. It’ll also house 2+2 seating and all of Merc’s (and AMG’s) latest driver-assist systems. Expect it to be autonomy-ready for when rules allow, but with a whole host of driver-flattering tech in the meantime—as well as four-wheel drive. Something no previous SL has offered.

The big talk is weight, with every feasible gram chiseled out by crafting the chassis from a composition of aluminum, steel, magnesium, and fiber composites. At 270kg, it weighs as much as an especially bulky motorbike. More pertinent is Merc’s focus on the car’s overall center of gravity, so all the powertrain mounting points will place the heavy items as low as possible. It goes hand in hand with switching to a fabric roof from top-heavy folding metal.

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The chassis boasts 18% more torsional stiffness than you’d find in the outgoing SL’s, and it’s more rigid than the GT Roadster. After a decade (or more) of the Merc SL being a bit of a soft option, AMG is making it fighting fit to take on 911 Cabriolets, Ferrari Portofinos, and presumably everything in between.

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Now we just need to see it fully clothed. Excited?

NOTE: This article first appeared on TopGear.com. Minor edits have been made.

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PHOTO: Daimler AG
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