repensée dans tous les détails, cette moto ...

"from the road up" = starting from the road (the bottom) and then everything above (+ up) = the whole vehicle has been (re)designed from top to bottom - examining the functionality of all the elements/components.:

see:

Newly designed and engineered from the road up..
[http://www.hankstruckpictures.ca/motor_carrier_mb_hayes_arti...]


.Mechanically, the cars have been re-cnglneered from the road up. Two chassis improvements among a number worked out hy Studebaker engineers arc self-adjusting brake« and a redistribution of weight that promises to revolutionize conceptions of riding comfort. New Styling ... New Comfort ... New Safety New Performance
[http://www.newspapers.com/newspage/51115773/]

the Ultra LF has been specially engineered from the road up—with features and options other low floor buses simply can’t touch.
[http://www.kirkmanbussales.ca/bluebird/commercial/ultraLF.ht...]

and "the road" is not literally a road, as shown in the case of this recording studio:

STUDIO INTERIOR
The Studio is engineered from the road upfor the needs of on-location audio recording, with custom built double thick walls and ceiling providing excellent sound isolation from the outside world.
[http://www.remoterecording.com/popupimages/studiotour.html]

NOUVELLE MESSAGERIE
• La messagerie a été complètement repensée.
[http://forum.thesettlersonline.fr/threads/27543-Nouvelles-ve...]