BL stands for ‘Blue Line’ representing SunTour’s determination to inject some style and colour into the overly technical world of derailleurs. I have a vague memory that the BL was marketed with images of sun-kissed waves crashing onto romantically rocky shores, and all this six years before Shimano tried something similar with Sante. As a response to Shimano’s attempt to inject some surrealism into their 1978 600 groupset with its Arabesque patterns, the SunTour BL looked alluringly logical.


The derailleurs themselves were, however, slightly disappointing. Heavily derivative of the old V series, priced above the Vx and just below Cyclone, they were not particularly well finished and were curiously retro in their lack of allen bolts and their use of cable clamp fittings from the old V series. They were also heavier than the Vx.


This example has a mid length pulley cage - which is moderately unusual.


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  1. Brand: SunTour

  2. My category: SunTour - the V story

  3. Country: Japan

  4. Date of introduction: 1980

  5. Date of this example: 1980 (two letter date code is WI)

  6. Model no: 3600

  7. Weight: 224g

  8. Maximum cog: Maximum cog: 26 teeth (hanger 27mm or less), 28 teeth (hanger 29mm)  or 30 teeth (hanger 32mm or more) (Source: SunTour)

  9. Total capacity: 30 teeth (Source: SunTour)

  10. Pulley centre to centre: 59mm

  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

  16. My theme: A riot of colour

0034/A

SunTour BL S (3600)

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SunTour_BL_derailleur_%283200%29.html