Quick Photoshop rendering of a road bike from the late 90s.
Marker sketch of a track bike done in the late 80s (definitely dated by the toe clips).
Sketches and Photoshop rendering of a bent-ply bike concept from around 2006
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Bicycle sketches and renderings

A few of my older pencil, marker, and Photoshop concept sketches of bikes

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James Thomas
Sr. Product Designer at Progress Lighting Greenville, SC