In French, "magazine de vélo" is masculine. The word "magazine" is masculine, so the entire phrase takes on a masculine gender. You would use masculine articles and adjectives when referring to it.
un vélo (masc.)
In French, "vélo" (short for "vélocipède") is considered masculine. The full word "vélocipède" is a masculine noun, so it retains the same gender when abbreviated to "vélo."
Michael Velo was born in 1851.
Velo Veronese's population is 792.
Velo d'Astico's population is 2,350.
Philips Velo was created in 1998.
I can find no reference to any saint named Velo.
Fran Velo was born in Galicia, in Spain.
Teresa Velo was born in 1942, in Mexico.
Teresa Velo went by Tere.
The area of Velo Veronese is 19.1 square kilometers.
The area of Velo d'Astico is 22 square kilometers.