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PostPosted: Fri Oct 26, 2012 5:16 am 
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Joined: Wed Sep 16, 2009 10:25 am
Posts: 194
Location: Australia
Just checking up on the weight of the double FC-M785- anyone here have actual weights?

Upgrading my girls mtb cranks from the heavy FC-M542's and want to see what sort of weight savings can be achieved. I would also consider the FC-M985 XTR double if there is a reasonable weight reduction.

FC-M542- 960 g with BB (I believe)
FC-M785 XT double -740g (Competitive Cyclist listed weight, BB included or excluded?) EDIT- Bike24 list these as 810g with BB which is less impressive...
FC-M985 XTR double 'Race'- 629g (Competitive Cyclist listed weight, BB included or excluded?)

So best case scenario that's a 331 g reduction if you go from M542 to XTR, sounds good right?

EDIT- May have just answered my own question, found this: http://www.birota.ru/files/news/2010/xtr-weight.pdf
So XTR FC-M985 is 715g

Making best case scenario 245g.

Thoughts on this being a good area to reduce weight?


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PostPosted: Fri Oct 26, 2012 6:43 am 
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Location: Estonia
FC-M785, 40/28, 175mm: 733g
BB: 92g, with 3x 2,5mm spacer.

Installed those yesterday.

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Posted: Fri Oct 26, 2012 6:43 am 


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PostPosted: Fri Oct 26, 2012 7:10 am 
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Thanks for that rainerhq.
So XT are about 150g lighter than the Deore M542's.


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PostPosted: Fri Oct 26, 2012 7:43 am 
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Here you have weights of whole group

http://www.sicklines.com/2010/08/24/ver ... -m980-xtr/


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PostPosted: Sat Oct 27, 2012 3:58 am 
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Location: New Hampshire
My 175mm XT M785 26/28 came to 721 grams. BB was 91.


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Posted: Sat Oct 27, 2012 3:58 am 


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PostPosted: Sat Oct 27, 2012 9:45 pm 
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Location: Midlands, United Kingdom
I understand that the XT double (and bash) uses a thicker axle than the triple, so if you are WW it start with a triple even if you intend to bash it......plus the Shimano bash is very heavy, circa 150g

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