Looking for "how to" video on overhauling 1990s Shimano thumbshifters

rodgers73 Posts: 2,626
edited June 2016 in Workshop
I've got an old MTB with the thumb levers (labelled "Shimano SIS System") that need a good servicing but cant find much on Youtube that is of any use to me.

They are the sort with a single lever that simply turns on an indexed pivot, not the type with both an up and down trigger shifting mechanism.

If anyone has any videos or links to text-based advice pages that would be much appreciated.


  • imposter2.0
    imposter2.0 Posts: 12,028
    Probably be better off asking in the MTB section, not the road section. Or ask on the Retrobike forum.
  • kajjal
    kajjal Posts: 3,380
    I had similar and just swapped them out for brand new which worked much better.