Suntour ARX GT Long Cage Rear Derailleur: RD-4500 (Near Mint+ <50 Miles)
This rare early to mid 1980's rear derailleur was situated one step below Cyclone MK-2, and was Suntour's response to the then radical Shimano 600 AX groupset. It shifts extraordinarily well, just like the Cyclone. it weighs an impressive ~257 grams in this long cage, and features the same internal cable routing the Cyclone has. It is a "GT" model, with the split outer cage plate allowing you to remove the chain from the derailleur without removing a pulley.
Near mint, barely ridden with under 50 miles. It is extremely close to pristine with the exceptions of a lower/left knuckle scrape and a touch of decal wear.
- Long cage