Shimano launched the MJ with much fanfare as a derailleur specifically designed for children’s bikes. The cynics amongst us noted the similarity to the Shimano Tourney TY30 and wondered whether the ‘child friendly design’ went any further than the rather alluring ‘holographic’ nameplate.

I can’t remember if Shimano claimed any mechanical differences between the MJ and the Tourney - but the MJ did not seem to be a specifically ‘children’s design’ - unlike the Shimano Lark Mini (DD-400) or the SunTour Love.

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1. 
   

2. •Brand: Shimano
   

3. •My category: Shimano - weirdness
   

4. •Country: Japan, manufactured in Singapore
   

5. •Date of introduction: 1993
   

6. •Date of this example: 1993 (two letter date code is RD - yes, really)
   

7. •Model no: MJ10 SS
   

8. •Weight: 308g including hanger plate
   

9. •Maximum cog: 28 teeth (Sutherland’s 6th edition)
   

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

11. •Pulley centre to centre: 55mm
    

12. •Index compatibility: 6 speed (Sutherland’s 6th edition)
    

13. •Chain width: 3/32”
    

14. •Logic: top normal
    

15. •Pivots: two sprung pivots
    

16. •Material: steel (the plastic is decorative!)
    

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