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Shimano XT Dyna-Sys FC-M785 Double Crankset

Sale $161.99 $269.95 40% off

Item # SHI0403

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  • Black, 175mm/26-38 ($161.99)
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Item # SHI0403


With 10-speed cassettes having 36 tooth big cogs, the door was opened for re-evaluation of the standard triple crankset. For many riders, some of the available gear options would be redundant and unnecessary with a 3x10 setup, not to mention some gears at the bottom or top of the range would generally be unused. And since we all quest for simplicity and lightness, 2x10 drivetrains make a lot of sense. Like their XTR Trail and Race groupsets, Shimano XT cranksets get different gearing options.

While their 3x10 option is intended for trail riders, this Shimano XT 2x10 Hollowtech II Crankset FC-785 is perfect for riders that prefer to pedal hard over slowing down to smell the flowers. Shimano's 2x10 chainring set delivers faster, easier shifts. The reason why is the elimination of the ambidextrous middle chainring. The little ring is designed exclusively to allow the chain to go to the big and vice-versa. Neither has to do double duty. And with a Shimano asymmetric chain, the system is optimized throughout.

The Hollowtech II arms have been reshaped with an asymmetric design that's different yet evokes the sophistication of XTR. The right arm is pressed together with the hollow 24mm spindle at the factory, and the splined left crankarm mates to the spindle during installation and is secured with perhaps Shimano's best detail -- two pinch bolts to secure the arm once the bearing preload is dialed in perfectly. In our experience, it's a superior design in terms of installation, performance, and durability.

The Shimano XT 2x10 Hollowtech II Crankset FC-785 is Black and has a 104/64mm bolt circle diameter. You'll choose between 40/28t or 38/26t gearing options. The big ring is ramped and pinned for easier shifting. It's available in 170-180mm lengths in 5mm increments, and the bottom bracket is included.

  • Hollowtech II Crankset
  • Compatible with Shimano

Tech Specs

Arm Material:
Arm Length:
170 mm, 172.5 mm, 175 mm, 180 mm
Chainring Sizes:
28 / 40 t, 26 / 38 t
Bolt Circle Diameter:
104 mm
Bottom Bracket:
Shimano XT
BB Type:
BB Threading:
Recommended Use:
mountain biking
Manufacturer Warranty:
2 years

Reviews & Community


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best value in

  • Familiarity: I've put it through the wringer

I've got 3 bikes and these cranks are on two of them. Unless you're getting your stuff for free, it should probably XT.


  • Familiarity: I've put it through the wringer

In my opinion XT is the workhorse for Shimano. All the great technologies of XTR at a cheaper price point. I've been running this crank with a single ring for 2 years on 2 different bikes and have had zero issues. If you are looking for a durable crank at a great price this is it.

Excellent an A+++ Crank Set!!

  • Familiarity: I've put it through the wringer

This crank set works as the description said… nothing to envy to the XTR set. Very low weight and it feels great and the price is amazing!!

Excellent an A+++ Crank Set!!

Dyna-sys 44/28 double

  • Familiarity: I gave it as a gift but have feedback to share

Can I use a 44t ring with the dyna-sys double (44/28)? Will the dyna-sys FD work with my existing XT shifter?

Old time amigo

  • Familiarity: I've put it through the wringer

Have just over a thousand miles on these and no issues. From xc to chair lifts they are spot on. Work well and are pretty light. Using them with all XT drivetrain on my SC Blur LTC.

really too big for my mother's xs bike...

If you're talkin' arm length, the smallest they come in is 165mm. If it's gear inches, then you'll need to swap out those rings.

why spend more on XTR?

  • Familiarity: I've used it several times

as with several components in the shimano line, I find it hard to justify the additional cost of the XTR crankset vs. the XT crankset. this 2x (mine is 40/28) is incredibly stiff with only minor weight concessions. i paired it with the e-type XTR front derailleur and XTR shifters. set-up is incredibly easy, and shifting is smooth on all trail conditions. solid performance/price ratio.


  • Familiarity: I've put it through the wringer

I've been using XT cranks on many of my builds since the late 90's. They are relatively light weight and eXTremely durable (see what I did there?) Sure, they are not as lightweight as XTR's, but you only need those if you're some kinda pro racer! Seriously, who are you trying to kid?! The most awesome thing about these XT cranks (besides coming in 2 different colors, hollah!) is that they are quite affordable, even more so when they're on sale! The included BB installs easily and is smooth like buttah. You won't be disappointed with these cranks.

If I got the 28-40, could i replace the...

If I got the 28-40, could i replace the 28 with a 26?

Yes, you should have no problem swapping out the 28t with a 26t. You can actually go down to a 24t if needed. That's the smallest you can use on these double-ring cranks.


  • Familiarity: I've put it through the wringer

As we all know XT is the workhorse of Shimano. Not only will it not break the bank but it will last forever. I ordered my girlfriend a full XT groupo because I knew it would withstand the punishment. I just upgraded her group to a 1X setup with a wolftooth and I must say that I’m jealous of her little ripper now.


i see your set up and like it. i'm currently running a single speed with a 104 bcd crankset. do you know if i could remove the rings on this SHIMANO XT DYNA-SYS FC-M785 DOUBLE CRANKSET and put on my single current chain ring? your (or anyone else's) advice would be appreciated). what do i need to think about?

Unanswered Question

Is the listed weight of 740g including the...

Is the listed weight of 740g including the BB or no? Other websites list it and comparable cranks at around 820g. Shimano itself does not list weights of their products. Hard to find the truth it seems. Have any customers here weighed theirs?

Unanswered Question

specs say BB Threading: English, yet lists...

specs say BB Threading: English, yet lists a press fit bottom bracket part number. So is it press fit or threaded?

Will this crankset work on frame with a...

Will this crankset work on frame with a PF30 bottom bracket?

Yes, I'm running it on my Dogma XC 9.9 with a Chris King PF30. you will need the adapters for the PF30 (sold separately), on Chris King it is conversion #2 for 24-mm MTN.

Avg. ride time: 1h 53m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.


  • Familiarity: I've put it through the wringer

This crankset combined solid Shimano shifting performance with a package this is lightweight and Strong for a steed from XC to DH. DH? Really? Yes, the 104 BCD allows you to run a single ring easily if you'd prefer. From the hollow crank arms to sturdy chainrings, this crankset can take some abuse. It includes an English threaded BB.

The Standard in Cranksets

  • Familiarity: I've put it through the wringer

Shimano's Hollowtech II system is the best crankset design on the market. It delivers top-notch stiffness with bombproof durability. When the time comes to overhaul your crank/BB (which isn't very often with Shimano), the simplicity and ease of doing so is also the best out there. The non-driveside crankarm is secured with triple redundancy, so there is simply no way it will loosen. My only complaint with Shimano doubles is the chainline is a bit closer than with SRAM, something to note if you are running any sort of guide system.

Avg. ride time: 1h 34m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

You Don't Actually Need "Better" Crank

  • Familiarity: I've put it through the wringer

The Shimano XT Dyna-Sys Double crankset is a get it done well component...Light, stiff, and solid...the Dyna-Sys chainrings are stiff and shift awesome. Don't hesitate to upgrade your heavier, old crank with this won't regret it.

Light, bombproof, stiff.

    You get all three. It's a wonderful thing. Truthfully, you could run most any crank from Shimano and be happy with it. This one looks better, is a tiny bit stiffer and lighter, and shifts marginally better than lower-tier cranks. Well worth the dollars.

    My current bottome bracket is a 73, is...

    My current bottome bracket is a 73, is this one compatible with the 68/73 standard

    Best Answer

    Yes, the BB comes with spacers to run with 68mm frames.