Schwinn GT510

Schwinn GT510 derailleur main image

The Schwinn GT510 was supposedly an improvement on the insane Schwinn GT500.

The Allen key hanger bolt has been replaced by a riveted on hanger, with a dodgy hidden plastic insert playing a key structural role between the hanger and the body of the derailleur - probably not good. You get a funky black drop out bolt and adjustable cable outer stop. Weirdest of all you seem to get one of Huret’s toothless ball bearing mounted tension pulleys - very hip in 1960.

What anyone in France or Chicago can have been thinking about speccing this gear in 1978 is beyond comprehension.

  • Derailleur brands: Schwinn, manufactured by Huret
  • Country: USA, manufactured in France
  • Date of introduction: 1977?
  • Date of this example: 1978 (stamped 3778, week 37 1978)
  • Model no.: unknown
  • Weight: 345g including hanger plate
  • Maximum cog: 28 teeth (Sutherland’s 4th edition)
  • Total capacity: 30 teeth (Sutherland’s 4th edition)
  • Pulley centre to centre: 50mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: unsprung
  • P pivot: sprung
  • Materials: largely steel with one bronze parallelogram arm

Browse associated documents.

US Patent # 4,058,020 - Huret

US Patent # 4,058,020 - Huret

US Patent 4,058,020 - Huret Allvit Safety thumbnail