On first look everything about this SunRace derailleur looks right. The slant parallelogram, the allen key cable clamp bolt, the aluminium knuckles with rather interesting black crackle finish paint - it all looks good - at first.

However on further inspection the rear knuckle has a very short drop, as if it is from as road gear, the pulley cage is enormously long and the guide pulley seems weirdly placed - it’s like a Shimano Deore XT but designed from memory at the end of a long day. Shimano did produce an Exage model that looked a bit like this - but SunRace seems to have taken it to extreme lengths.

Very odd.

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1. •Brand: SunRace
   

2. •Country: Taiwan
   

3. •Date of introduction: 2001?
   

4. •Date of this example: unknown
   

5. •Model no: 580
   

6. •Weight: 287g
   

7. •Maximum cog: 32 teeth?
   

8. •Total capacity: 38 teeth?
   

9. •Pulley centre to centre: 87mm
   

10. •Index compatibility: 6 speed?
    

11. •Chain width: 3/32”
    

12. •Logic: top normal
    

13. •Pivots: two sprung pivots
    

14. •Material: aluminium knuckles, steel parallelogram plates and pulley cage plates
    

0366/M