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This 2025 Radical SR10 XXR, purchased new from Radical Northwest and presented in outstanding condition with less than 10 total hours since new. The SR10 XXR represents the most advanced evolution of Radical’s flagship prototype, combining modern safety, extreme downforce, and endurance-proven performance in a lightweight, purpose-built race chassis. Powered by a RPE-Ford 2261cc turbocharged engine producing approximately 425 horsepower and paired with a six-speed Hewland sequential gearbox, the SR10 XXR delivers exceptional straight-line speed, massive braking capability, and cornering forces exceeding 2g. With a carbon-fiber safety cell, FIA-style halo, and full aerodynamic package, the SR10 XXR is engineered to perform at the highest level of prototype racing while remaining approachable and rewarding to drive.
This example has been professionally campaigned and meticulously maintained by Oltoff Racing, competing in only two race weekends at two of the most demanding circuits in North America. At Daytona International Speedway, the car finished P3 overall, running behind a Riley MkIIIB and a Ferrari 333SP, with an estimated 30 mph delta into Turn 1, underscoring the SR10’s real-world performance against higher-displacement prototypes. At Sebring International Raceway, the car was dominant—finishing P1 in all three races, showcasing both outright pace and durability over punishing conditions. A minor pit-lane contact resulted in front headlight damage, which has since been professionally repaired with no structural or mechanical impact.
Additional Details
Key Highlights
Less than 10 total hours
Race-winning history
Professionally maintained by Oltoff Racing
No expense spared option list
Turn-key with spares and data systems
Factory & Performance Options
Carbon center seat
Halo safety system
Carbon dive planes
Carbon rear spoiler
Carbon diffuser
Fuel sampling drain kit
TPMS system
AIM SmartyCam with GPS
Racing radio system
Garmin Catalyst
Transponder
Flagtronics system
Included Spares & Extras
Extra set of wheels with TPMS
Extra springs
Multiple sway bars
Various gear sets
Spare gear ratios
Specs
BODY
Lightweight spaceframe chassis with FIA certified safety cell
FIA certified 77-litre (20 US gallons) fuel cell
Composite bodywork, front splitter and rear diffuser
Carbon fibre high-downforce bi-plane rear wing
LED running lights and brake lights, FIA high-intensity central rain light
ENGINE
RPE-Ford 2261cc turbocharged engine with direct injection
Forged motorsport pistons, connecting rods and bespoke dry-sump
Twin-independent variable cam timing and drive-by-wire throttle
Custom Garrett turbocharger
Life Racing ECU engine management system and data logging
Hi-flow racing exhaust system
Lithium-Ion battery and trickle-charger included
COCKPIT
Driver and passenger seats with 6-point seatbelts
AiM Formula steering wheel with integrated 4.3” TFT display
Shift paddles and on-wheel switching including pit limiter
Rev counter, gear indicator, shift light, and predictive lap time
SmartyCam video system with GPS
Brake pressure and steering logging sensors
Carbon Fibre Dashboard with backlit touchpad and brake bias adjuster
FIA Fire Extinguisher with dash mounted and external activation
FEATURES
Bespoke Radical four-pot calipers with front & rear brake cooling
315mm x 35mm fully-floating 48-vane disc brakes
POWERTRAIN
Six-speed Hewland sequential transaxle gearbox
Paddle-activated gearshift system with auto-blipper
Automatic torque-biasing limited slip differential
SUSPENSION
Unique fully adjustable Nik-Link suspension system
Front and rear wishbones, adjustable pushrods
Servicable aluminium cast uprights
Interchangeable roll bars front and rear
Intrax triple-adjustable dampers with Anti-Roll Control (ARC) technology
WHEELS AND TYRES
Bespoke Braid centre lock, cast aluminium racing wheels
8" × 15" diameter front and 10.5" × 16" rears
Hankook Racing Tyres (slick & wet options)
DIMENSIONS
Length: 4077mm
Width: 1799mm
Height: 1093mm
Weight: 725kg
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