Quadrant             GB  1906  1908   Quadrant Cycle Co.Ltd., Birmingham
    Quagliotti           IT  1904         n/a
    Quantum              GB  1985  now    Xtreme Works, Loddiswell, Kingsbridge, Devon


Quantum H4 (2000)

    Queen               USA  1903  1906   C. H. Blomstrom M. C. Co. Detroit Mich.
    Quinchuan           CHI  n/a          n/a
    Qvale                IT  1998  now    n/a


Qvale Mangusta Targa (2000)