Shimano XTR M970 Crankset Specs.
The
m970 is a 2 piece crankset from the Shimano XTR crankset line
of MTB bicycle components. It includes a 3 piece chainring set
where the outer gear and the middle gear use fixing bolts and
nuts to attach to either side of the crank arm spider.
The small inner gear is attached to the spider with a separate
set of fixing bolts with no nuts.
You have two sets of chain ring options and neither are interchangeable
with the XTR m960 series which uses a stepped spider to hold each
chain ring separately. Some of the bottom bracket components are
interchangeable though, although not identical in appearance.
Shimano XTR M970 Crankset Specs:
Weight: 775 g
Crank Arm: Hollowtech II Crank Arm, anodized aluminum
Crank Arm Length Options: 165mm to 180mm in 2.5mm intervals
BCD: 104 mm for the outer and middle gear that mount on
either side of the spider and 64mm for the small inner gear.
Chainring Options: 44 -- 32 (AA) -- 22T or 44 -- 32 (AB)
-- 24T on a 4 arm spider,
Inner and Outer Ring is made from 7075 Aluminum painted and nichel-plated,
The middle ring is Titanium teeth mounted to a composite carbon
fiber carrier.
Chain: Super Narrow HG for 9 speed
Bottom Bracket: The bottom bracket assembly is included
with the XTR M970 Crankset, traditional setup uses 3 - 2.5 mm
spacers, two on the drive side and one on the left side, see the
diagram below. 68 or 73mm shell compatible.
Pedals: 9/16" diameter
Tooling: Does require special Shimano wrenches for installing
the bottom bracket and the crank arm.
Pricing: $550 seems to be the norm but try a few of these
links as I have seen it as low as $499.
Further Information:
Shimano Bicycle Parts:
Index of Articles about Various Shimano Bicycle Parts
