XT M771 Front Derailleur tuning

These derailleurs start out at around 160g, but with a bit of creative whittling and some alu bolts you can drop the weight down to around 130g:

This compares favourably to the weight of an XTR front derailleur but at a fraction of the cost.

Related articles:

XTR rear derailleur tuning

There's really minimal tuning available for the XTR RD-M972 shadow 9-speed derailleurs without breaking out the dremel and shaving parts down.

Rear derailleur tuning

Is it worthwhile?

Fixing a twisted rear derailleur

If you ride off-road its almost inevitable that at some stage you'll damage your rear derailleur. Bending it back into shape can be a little tricky. I have used the approach outlined below with good results:

SRAM X.7 rear derailleur

Shimano Zee Rear Derailleur

Comes in two different versions:

Shimano derailleur spare parts