Originally Posted by
zenolee
Unfortunately I can't post any links or pictures until I pass the 10 post limit. It's SunTour MounTech
Specs copied from website:
- Derailleur brands: SunTour
- Categories: SunTour - the mountain bike gears, SunTour - Frank Berto and the curse of Duopar
- Country: Japan
- Date of introduction: 1982
- Date of this example: 1982 (two letter date code is YE)
- Model no.: 4900
- Weight: 273g
- Maximum cog: 34 teeth (Source: Sutherlands fourth edition)
- Total capacity: 34 teeth (Source: Sutherlands fourth edition)
- Pulley centre to centre: 65mm
- Index compatibility: friction
- Chain width: 3/32”
- Logic: top normal
- B pivot: three pivots, rear unsprung and the other two sprung
- Materials: largely aluminium with steel pulley cage plates, link element plate and inner parallelogram plate
If you’ve got that first generation Mountech- the one with the upper pulley built into the unit- find something else to replace it with- there’s a gazillion other derailleurs out there that don’t present the possibility of catastrophic failure like these do.
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