Shimano Deore XT FC-M770 Crankset

4.06/5 (17 Reviews)
MSRP : $199.98


  • Store Price

Product Description

The Shimano XT FC-M770-10 Hollowtech ll crankset gets its name from its hollow forged crank arms, providing strength with big savings in weight.


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Reviews 1 - 15 (17 Reviews Total) | Next 15

User Reviews

Overall Rating:5
Value Rating:5
Submitted by lnter1908 a Cross Country Rider from Malta (Europe)

Date Reviewed: June 7, 2011

Strengths:    lightness

Weaknesses:    non

Bottom Line:   
I got this crankset on my Trek 8000. Its my first hollow crankset so i cant compare this crankset with other hollow set models but i can say that between this and the deore model there is lightyear ! i highly recommend this crankset

Expand full review >>

Duration Product Used:   3 months

Purchased At:   on my 8series trek

Similar Products Used:   deore non hollow

Bike Setup:   trek 8000 standard

Overall Rating:1
Value Rating:1
Submitted by mtbfan2 a Weekend Warrior from Redmond

Date Reviewed: April 17, 2011

Strengths:    None.

Weaknesses:    Everything. This crankset was better than the OEM crankset(40 dollar FSA internal) I had in that you could feel the power of your legs transfer through your bike into actual power..wooopty doo..after 1 week this product creaked literally up any little hill, I tried over tightening, over lubing, over cleaning and had absolutely no luck. If your an MTBer who can handle a very basic jump and your not a fat sal who thinks he/she wants to try something new to lose weight I recommend never buying this product.

Bottom Line:   
Smells like ass!!

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Favorite Trail:   Duthie Hill

Duration Product Used:   3 months

Price Paid:    $250.00

Purchased At:   Performance Bike

Bike Setup:   Teocali

Overall Rating:5
Value Rating:5
Submitted by jeffrey j a Weekend Warrior from Jacksonville, FL, USA

Date Reviewed: November 17, 2010

Strengths:    Cranks are light, stiff, and strong. Look great too IMO!

Weaknesses:    Finish gets kind of messed up easily. No biggie though...

Bottom Line:   
Took the stock SLX cranks off the bike and put these on. Was surprised to find them even stiffer and better at transferring power to the rear wheel than the SLX. Definitely worth the small price difference (plus I already had the cranks so no outlay of $ to me!).

Would certainly get the 10 speed set up if I was starting from scratch, just can't justify on this bike changing everything over (have a 2011 Specialized Epic 29er with SRAM 10 speed and it is a nice setup).

Expand full review >>

Favorite Trail:   FATS

Duration Product Used:   1 Year

Price Paid:    $300.00

Purchased At:   LBS

Similar Products Used:   Deore and SLX cranks

Bike Setup:   2010 Giant Trance X2 stock except these cranks and XTR cassette

Overall Rating:3
Value Rating:4
Submitted by hugoxc a Cross Country Rider from Portual

Date Reviewed: June 20, 2010

Bottom Line:   
i think that this product does the job very well for the prize that you pay, but nevertheless i will get the Sram XX one of these days....

Expand full review >>

Duration Product Used:   3 months

Price Paid:    $300.00

Purchased At:   Total Bike

Bike Setup:   Specialized Sworks HT M5 Frame
FORK Fox Float F90 RL
Mavic Crosstrail disc
FRONT DERAILLEUR Shimano XT
REAR DERAILLEURSRAM X-0,
SHIFT LEVERSSRAM X-0
CASSETTE Shimano XT
CHAINSRAM PC-971, 9-speed
CRANKSET Shimano XT
PEDALS XT
Sworks low rise handlebars
Avid R sl brakes
SADDLESpecialized Phenom

Overall Rating:4
Value Rating:4
Submitted by XSL_WiLL a Weekend Warrior from Naperville, IL, USA

Date Reviewed: June 4, 2009

Bottom Line:   
Well, I can't offer any insight to the longevity or shifting of the rings since I am using the crank as a single ring.

But I can say that the cranks are fantastic. I've always been a fan of the crank/spindle interface that Shimano uses. The bearing preloaded can be adjusted, and then the pinch bolts are torqued down. The spindle won't wear out and constantly come loose or make noise.

Though you should use a torque wrench to tighten the pinch bolts. Too much torque could distort the interface and cause the cranks to loosen.

The bottom bracket is good. Make sure the shell is faced and chased. Do not crank down on the little end cap on the spindle. Only snug it up so that all the play is removed from the system.

I am not using the arms for their intended purpose. I ride dirt jump, street, slalom, etc. And they have held up beautifully. I was worried about the lack of a pedal insert, but I figured that I could always insert a helicoil if I snagged a pedal hard enough to destroy the threads.

These cranks are great for XC and AM riders. And I would recommend them to smoother or lighter gravity riders as well.

They are light and durable.

Expand full review >>

Duration Product Used:   1 Year


Overall Rating:5
Value Rating:5
Submitted by reinaldogt a Weekend Warrior from Miami, FL, USA

Date Reviewed: April 11, 2009

Strengths:    I have been using it for about 2 months, its very reliable and the BB its one of the best...

Weaknesses:    None so far...

Bottom Line:   
If u have the money to spare and want to upgrade the bicycle, get it!!!!

Expand full review >>

Favorite Trail:   Oleta River

Duration Product Used:   3 months

Price Paid:    $3000.00

Similar Products Used:   Shimaro deore, FSA power drive

Bike Setup:   Giant Anthem X1, full xt/xtr, rockshox team, rp2, avix elixir R 160/160...

Overall Rating:5
Value Rating:5
Submitted by strglide a Cross Country Rider from Long Island, NY

Date Reviewed: April 4, 2009

Strengths:    Stiff, strong and lightweight. Two-piece design means there is less chance of it loosening up. External bottom bracket is wider than the ISIS BB I replaced which adds to stability and strength. Looks cool!

Weaknesses:    Haven't found any yet.

Bottom Line:   
This has been a very nice upgrade to my bike. It now seems to accellerate and climb easier, probably due to the overall strength of the crankset. I would highly recommend this crankset. Shimano's SLX appears to be the same but has a steel granny gear instead of the XT's alloy granny gear.

Expand full review >>

Favorite Trail:   White House front lawn

Duration Product Used:   3 months

Price Paid:    $160.00

Purchased At:   used on ebay

Similar Products Used:   Shimano Deore cranks and older XT 3 piece cranks.

Bike Setup:   Specialized Epic

Overall Rating:5
Value Rating:5
Submitted by fast_ticket a Cross Country Rider from Monterey, CA

Date Reviewed: January 9, 2009

Strengths:    Strong, light, nice machining, it works

Weaknesses:    Installation directions - check with your frame builder

Bottom Line:   
It was time for an upgrade and I ended up skipping over the Isis phaze. For years I used Raceface Turbines, but the reviews on mtbr cause me to shy away from the Deus. The new outboard bearing & oversized spindle made sense to me and looks to be the new industry standard. The new design is easy to maintain (as long as u have the correct tools). Caution: check with your frame manufacture about install. Shimano recommends putting the bearing/cup spacer on the drive side. On the Salt this creates a lot of cross over in the larger cogs (easier gears) putting more lateral strain on the chain. This creates noise/shifting/wear issues. After confiring with Sherwood at Ventana, I put the spacer on the non-drive side and voila no issues.

Expand full review >>

Favorite Trail:   All

Duration Product Used:   1 Year

Price Paid:    $165.00

Purchased At:   Blue Sky

Similar Products Used:   None, other than older Shimano & Raceface tapers

Bike Setup:   Ventana El Saltamontes, Fox F Series, Juicy's, Mavic Crosstrail, XT everything else

Overall Rating:3
Value Rating:5
Submitted by Erik Kaziska a Weekend Warrior from South Carolina

Date Reviewed: December 31, 2008

Strengths:    Made outside of America!!! Proves that other country's are doing it right and using their heads...more thought, passion, and expertise put into this design.


Weaknesses:    Middle business level Americans adding 300 percent markup on price to line pockets. Find your own outsource provider and buy this item new for $40. This is still 10X more than the laborers get paid to make it.

Bottom Line:   
Save your money and buy into a political position! According to our US capitalist mindset, the environment can wait for the next generation...build it bigger, waste more and use it up quickly before someone else gets their grubby paws on it...
Oh yea, on a conservative Blond perspective... "It's pretty and shiny!"

PS: I really doubt this will get posted, nobody wants to share insulting, political humor!!!!

Expand full review >>

Duration Product Used:   Tested or demo'ed only

Price Paid:    $40000.00

Purchased At:   Buddy of Sumter

Similar Products Used:   Others that turn a chain...

Bike Setup:   Two wheels, seat, handle-bars, pedals etc...

Overall Rating:5
Value Rating:5
Submitted by ieatfood a Weekend Warrior from nashville, tn, usa

Date Reviewed: August 10, 2008

Strengths:    strong, lightweight.

Weaknesses:    none found

Bottom Line:   
i used these cranks in new zealand on many all mountain/freeride trails and they held up just fine. i did not have one problem with them. they are super stiff, light weight, and pretty good looking as well.

Expand full review >>

Duration Product Used:   1 Year


Overall Rating:4
Value Rating:3
Submitted by Swift Rider a Cross Country Rider from CA, USA

Date Reviewed: May 29, 2008

Strengths:    power transfer is seamless, cranks are smooth and do not harm your shins if you crash, angle of crank arms puts them out of the way of your feet, lightweight

Weaknesses:    third chain ring is useless (as always), polished aluminum wears easily so surface scratches are easily visible, easy to dent

Bottom Line:   
Get this if you only do XC. These cranks are not suited for DH, you need something stronger. They are very lightweight and responsive for transferring power to the chain.

Expand full review >>

Favorite Trail:   Skeggs

Duration Product Used:   1 Year

Price Paid:    $120.00

Purchased At:   Performance Bikes

Similar Products Used:   shimano strong arms, square taper BBs, ISIS BBs, raceface evolve BB with raceface cranks

Bike Setup:   Specialized Enduro Pro XC build with XTR/XT drivetrain, Fox float front and rear shocks.

Overall Rating:1
Value Rating:1
Submitted by lach a from toronto, on, canada

Date Reviewed: May 28, 2008

Strengths:    i dont know, bent it before finding out any of its strengths.

Weaknesses:    bends if you do a 4ft drop

Bottom Line:   
i would be a nice crankset if it didnt bend. wish i didnt waste my money. oh well, time for another race face diabolus.

Expand full review >>

Duration Product Used:   Less than 1 month


Overall Rating:5
Value Rating:5
Submitted by JohnV a Cross Country Rider from Alabang, Muntinlupa, Philippines

Date Reviewed: May 24, 2008

Strengths:    This thing just cranked up speed whether XC trailor road. It keeps going, and going, and going!!! What a crank.

Weaknesses:    none so far

Bottom Line:   
VERY GOOD PERFORMANCE....

Expand full review >>

Favorite Trail:   Santa Rosa Bike Trails

Duration Product Used:   Less than 1 month

Price Paid:    $200.00

Purchased At:   Egay Reyes Bikes Makati

Bike Setup:   Merida Sub 60 Hardtail, Syncros rims / DT Swiss spokes / XT Hubs, XT gruppo, Maxxis crossmark tires

Overall Rating:5
Value Rating:5
Submitted by Aaron Martin a Cross Country Rider from Escondido

Date Reviewed: May 8, 2008

Strengths:    Light, Stiff, durable finish, easy to setup.

Weaknesses:    none

Bottom Line:   
At this price point they are unbeatable with regard to durability and performance. Shimanos chainrings shift quicker and smoother than most others. They can be had really cheap on Ebay and at performance when you catch a sale.
Shimano has finally made a more durable finish and moved the logo to a position where it is not worn off by your shoes. unlike the older XTR they don't look like they have a million miles on them after a few rides.
Installation and initial setup was very easy just make sure you follow the instructions and torque the bolts right.
I have found the chainring to be very durable. I have bashed it into a rock and a log without bending it and I have hit one rock hard enough to bend my pedal spindle with no damage to the crank.

Expand full review >>

Favorite Trail:   Noble Canyou

Duration Product Used:   6 months

Price Paid:    $190.00

Purchased At:   Ebay

Similar Products Used:   Race face deus, older shimano xt and XTR

Bike Setup:   Turner Flux, Salsa Dos Niner

Overall Rating:5
Value Rating:5
Submitted by Rome a Weekend Warrior from Yigo Guam

Date Reviewed: March 22, 2008

Strengths:    Light weight; well built; well finished

Weaknesses:    Takes a little more work to install. Getting you bottom bracket shell faced made add to the cost, do it or you will be replacing you bearings sooner than later.

Bottom Line:   
This crank is awesome. It may not make me much faster as far as the massive weight savings go, but with this set up the shifting has been flawless even with five pounds of Guam's famous red mud caked on my bike (Alabama clay has nothing on this stuff, it eats the wax off your car!). The price of this crank included bottom bracket shell facing, installation, and a new front derailleur. Even though I recreationally race I am careful not to beat my bike around. This Crank is made for light weight/racing applications and will hold up to the rigors of race conditions but will not suffer abuse from a hard rider. Bottom line; If you take care of your stuff this crank will be good for you. If you like to bounce your bike from rock to rock with no regard for your rig, this crank not is for you.

Expand full review >>

Favorite Trail:   Mt. Tenjo, Channel ten area

Duration Product Used:   Less than 1 month

Price Paid:    $250.00

Purchased At:   Hornet Sports

Similar Products Used:   Stock Shimano crank that came on the bike.

Bike Setup:   Stock '04 Fisher Marlin with the following upgrades; LX M580 shifters, XT M770 crankset, XT M770 front derailleur, XT M760 cassette, HG93 chain

Reviews 1 - 15 (17 Reviews Total) | Next 15

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