Studeo410 has Speedometer+ G12 (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $3.99) for a limited time.

Speedometer+ G12 features switching between car speedometer and bike cyclometer, Retina Display graphics for iPhone 4-4s and new iPad, switch between mph or km/h mode, imperial and metric unit settings, speed calibrate refresh button, GPS accuracy indicator, and GPS distance accuracy indicator.