SHOEHORNING an Aprilia SXV450 into a lightweight road racer created the GP45 Super Twins series, now the race bike has become a road-legal special.

In a bespoke build for a customer, the special uses the 450 Aprilia twin as a donor. The engine remains encased in the supermoto bike's chassis with custom moulded GP45 fairing and seat unit, taking the bike away from its roots. The engine is standard keeping the 60bhp and overall the bike weighs 120kg.

The GP45 SXV450 is suspended on Marzocchi USD 43mm race forks and the standard Sachs rear shock has been shortened to the spec of the race seres. Wheels of the bespoke SXV450 sports bike are Marchesini Magnesium GP race wheels, taken from Rattapak Willarot's Honda 250GP bike, with braking from the radial calipers of the Aprilia supermoto on wavy discs.

The price of the build has been kept confidential, but a basic kit for a self-built model costs £5300, not including the donor bike.

GP45 Road Bike Spec Sheet

Base Bike - Aprilia SXV450 2008

Forks - Marzocchi USD 43mm Race Forks

Yokes - GP45 Super Twin "Gull Wing" Race Yokes

Wheels - Marchesini Magnesium GP Race Wheels ( From Rattapak Willarots 250GP Bike )

Brakes - Braking Wavy Discs with SXV Radial Calliper

Clipons - GP45 Race

Fairing - GP45 SXV Type

Seat - GP45 SXV Type ( twin exhaust outlet )

Rear Shock - Standard Sachs ( Shortened to GP45 Race Spec )

Rear Sets - Adjustable GP45 Super Twin Race Kit

Digital Dash - Race Technology Dash 2 ( incl Revs, shift lights, mph & gear indicator )

Fairing Mounts - GP45 Super Twin Kit

Brake Disc Carriers - Bespoke Engineering by "Ashleys of Yeovil"

Tyres - Michelin Pilot Pure

Rear Lights - LED Indicators / Rear Lights.

Front Lights - Scooter Twin Headlights

Mirrors - Built in indicators

Fuel Tank - GP45 Super Twin Race Kit 10ltr (internal fuel pump from donor bike )

Rear Bobbins - GoFasterBits.co.uk

Engine - Standard

Paintwork - Bespoke paintwork to customer spec

For more information on the race series visit: www.gp45.co.uk