Shimano XTR CS-M970 lockring

Aluminum lockring that comes with XTR CS-M970 9 speed clusters - weight 5g. Standard steel lockrings are around 15g so switching to an alu version will save you an easy 10g.

Shimano XTR CS-M970 lockring

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XTR M970 9 speed shifters

weight: 219g (left shifter - 107g, right shifter - 112g);