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XT cranks

4xBoy

Turbo Monkey
Jun 20, 2006
5,034
341
Minneapolis
Are the M770 and M771 cranks the same except for the chainrings?

Or is there any choices for 26/36 or 28/38 rings that have shift ramps?
 

jon-boy

Monkey
May 26, 2004
799
0
Vancouver BC
And what's up with the use of a Torx T30 bolt for the chainrings now? What was wrong with a hex wrench? I had to go and get a new tool on Saturday to change the chain rings around!
 

4xBoy

Turbo Monkey
Jun 20, 2006
5,034
341
Minneapolis
T15 is for brake rotors, XTR needs a T30 and a T40. I still don't see if the crank arms them selves are different but I ordered the 26/36 rings.
 
Sep 1, 2007
321
0
16 powers st BKLN NY
771 composite middle middle rings have a slightly deeper profile that fits the "shelf" on the back of the spider.
Normal chainrings won't reach the shelf, but they fit fine with a bashguard in the big ring position.

The 770 arms themselves have a bulged shape.