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In response to Shimano’s radical 600 AX aerodynamic groupset, SunTour transmuted the Vx series into the aRX series (the name being something to do with aero and x). At first this seemed a brilliant move - the aRX series looked smooth and aerodynamic and modern, but was simple and practical unlike Shimano’s dangerous radicalism. Natty modern touches included allen key pulley bolts and an allen key cable clamp bolt.


But SunTour’s problems with controlling prices as the Yen sky rocketed were starting to tell. The Vx was all aluminium, the aRX had significant steel parts. And there were quality niggles - the aRx’s cable clamp bolt wasn’t quite of the quality it should have been and had an irritating tendency to strip.


The design also had its problems. Feeding the internal cable routing, acceptable on a deluxe low-volume product like the Cyclone, seemed a bind on the mass market aRX (I imagine manufacturers were particularly pained by this). I also suspect that SunTour had subtly changed its geometry - the aRx never seemed to shift quite as well as the older models.


Finally, by acknowledging the aerodynamic trend, SunTour had granted Shimano the status of ‘radical technology leader’ and taken up the role of ‘sensible conservative follower’. With the exchange of these roles the SunTour brand lost some sparkle that it never got back.


Before the aRX appeared, the Vx was still strongly out-selling the Shimano 600 series. A few years later the Shimano New 600 EX (6207) was comfortably out-selling the SunTour aRX. I personally used numbers of V’s and Vx’s, but shifted to Shimano at this time.


The plain aRX is the short arm version. Despite the steel parts it weighs in at a very impressive 193g.


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  1. Brand: SunTour

  2. My category: SunTour - the V story

  3. Country: Japan

  4. Date of introduction: 1981

  5. Date of this example: 1985 (two letter date code is BI)

  6. Model no: 4300

  7. Weight: 193g

  8. Maximum cog: 26 teeth (Sutherland’s 6th edition)

  9. Total capacity: 28 teeth (Sutherland’s 6th edition)

  10. Pulley centre to centre: 54mm

  11. Index compatibility: friction

  12. Chain width: 3/32”

  13. Logic: top normal

  14. Pivots: two pivots, front sprung and rear unsprung

  15. Material: aluminium knuckles, outer parallelogram plate and outer pulley cage plate, steel inner parallelogram plate and inner pulley cage plate.

0324/K

SunTour aRX (4300)

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