The 2021 Radical SR10 is an evolution of the already iconic open-top, track-day car series produced by Radical Sportscars. Fitted with a new engine and a new drivetrain package designed for both performance and durability, the SR10 is also one of the very few Radical models fitted with a turbocharger. Unlike many of its predecessors, the 2021 SR10 packs a Ford engine, a shift from the Suzuki mills used in the past. The engine tuned by delivers an impressive 425 horsepower.

The 2021 Radical SR10 is a racing prototype for the road

Design-wise, the SR10 retains the looks of its SR-badged predecessor. It features the same V-shaped front hood and nose, flanked by tall front fenders with integrated headlamps. A big splitter extends a few good inches away from the body just under the nose.

Similarities to previous SR cars continue onto the sides through massive openings in the side skirts, the absence of a windscreen, and the big rollover cage behind the seats. An F1-style engine intake also pops up behind the cockpit, while a massive rear wing dominates the rear end. The rear fascia is again inspired by racing prototypes, combining a thin center fascia flanked by vents to the sides and a large diffuser below.

The 2021 Radical SR10's interior is... radical

If you're looking for a sports car that offers comfort features, the SR10 is not for you, because all you will find here are a pair of race-spec seats with harnesses, a removable steering wheel, and a spartan dashboard with a few buttons and knobs. Basically all you need for a fun day at the races.

But the SR10 sports some new features compared to older Radical models, mostly borrowed from the SR3 XX. The new steering wheel features a multi-page LCD display, while the small center stack incorporates additional controls for better access to the car's features. You can now select from multiple engine and gearbox mapping options and adjust the optional electronic power steering system. The latter is a first for the SR line.

The 2021 Radical SR10 packs an angry Ford engine

Under the rear hood of the SR10 lurks a 2.3-liter inline-four engine. The mill comes from Ford, but it was heavily upgraded by Radical Performance Engines. It features a bespoke turbocharger by Garrett with better throttle response and reduced lag. Engine upgrades also include custom induction and management, as well as forged pistons and connecting rods, plus a dry-sump lubrication system.

How much power does it deliver? It's notably more potent than the familiar SR3, powered by a Suzuki motorcycle engine good for 225 horsepower, and it's only five horses less powerful than the SR8, fitted with a V-8. And that's a lot of oomph for a car that tips the scales at only 1,600 pounds.

No word on how quick the SR10 will hit 60 mph, but it's safe to assume that it will take less than three seconds. The SR8 hits the benchmark in 2.7 seconds and the SR10 could be just as quick.

The inline-four engine mates to a new six-speed Hewland gearbox derived from motorsport. Originally developed for the FIA F2 single-seater, the transaxle is being used for the very first time in a road-legal Radical model. Like any other Radical out there, the SR10 doesn't have ABS, traction control, or braking assistance, so it's as close to a race car as they get.

2021 Radical SR10 specifications

The 2021 Radical SR10 is somewhat affordable for a road-legal race car

The Radical SR10 starts from £126,000, which converts to roughly $166,000. It's not exactly affordable, but it's significantly cheaper than a Ferrari F8 Tributo or McLaren 720S, two cars that the SR10 will obliterate on the race track.