Shimano Deore XT FC-M770 Crankset

4.24/5 (25 Reviews)
MSRP : $213.49


  • Store Price
    Buy Now
    Buy Now
    Buy Now
    Buy Now
    Buy Now
    Buy Now

Product Description

With a stiff design, and a reduction in weight, the Shimano Deore XT M770 4-arm mountain bike crankset offers everything you need to go rambling through the woods with speed and shifting efficiency!


Review Options:  Sorted by Latest Review | Sort by Best Rating

Reviews 1 - 15 (25 Reviews Total) | Next 15

User Reviews

Overall Rating:5
Value Rating:5
Submitted by Flamingtaco

Date Reviewed: November 6, 2013

Strengths:    Strong crank design
Smooth shifts with correct Shimano chain
Thoughtful design
Can't beat the price, got mine when $275 was a great deal


Weaknesses:    None found yet.

Bottom Line:   
I am one of those fat sals (400Lb), except I'm not trying something new to lose weight, but rather returning to an activity I love (well over 80,000 spun miles to date). In addition to riding to work a lot, I have hit the trails maybe 30 times in two seasons. After the stock FSA crank tapers started to strip, I felt these cranks were the ticket to end all that noise.

Five months, 900 road miles and 30 trail miles, no problems. I don't do massive drops, but do get a little air at speed (6-8 inches), mostly stay out of the seat on the trails (downhill), and corner hard (top of berm line). I use wide pedals (xpedo faceoff) with 20mm extenders to fit my size 13 boots.

Not a peep from the cranks or bearings in a Cannondale F5 frame. I was present when the crank was installed, the shop was anal about getting it in right. The Hollowtech design is 10x better than taper cranks, of which I have several bikes that never gave me trouble once I got a step above the low-end cranks. If the install is correct and the BB threads were correctly cut by the mfg, there should be zero problems with a BB30 Hollowtech crank. Be sure to check the chainring bolts on any new crank before the first ride, and the BB and chainring and crankarm bolts after the first few hours of saddle time.

Overall Rating:5
Value Rating:5
Submitted by 247

Date Reviewed: August 31, 2012

Strengths:    Light, Technology vs. Price it is THE BEST!

Weaknesses:    None...

Bottom Line:   
for the price this is the Standard to go with on a decent build. It works and looks great! It is about 10 times better than Cranksets that are 1/2 this price (but about 95% as good as cranksets that are 3 times as much.)

Overall Rating:5
Value Rating:5
Submitted by b0mb3r a Cross Country Rider from newark de

Date Reviewed: June 9, 2011

Strengths:    Stiff, smooth, well made, great shifting, light and strong. If properly installed, the bottom bracket will last forever.

Weaknesses:    none

Bottom Line:   
These cranks are great, I doubt that you will find a better setup for the price. I rode them on my geared and single speed and they do not flex whatsoever. One thing to keep in mind is that you need to install bottom bracket cup spacers. Those spacers ensure that the bottom bracket is properly sealed. I also packed mine full of phil wood grease, before sliding in the cranks. After two years of riding, there was no dust in the bottom bracket and the bearings still roll smooth. I also suggest putting some teflon tape on the bottom bracket threads so the cups don't loosen up (that happened to me and they began to creak).

Expand full review >>

Favorite Trail:   middlerun

Duration Product Used:   2 Years

Price Paid:    $210.00

Purchased At:   performancebike

Similar Products Used:   Shimano Saint FC810, Shimano LX FC550

Bike Setup:   KHS Team ST, Fox F100

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!!

Expand full review >>

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 lowflier03 a Weekend Warrior from Atsugi, Japan

Date Reviewed: November 9, 2008

Strengths:    Cranks are nice and light compared to most of the others out there. Extremely stong, no flex, very smooth.

Weaknesses:    none

Bottom Line:   
For the price I paid for these cranks, they are unbeatable. Every other set of cranks I have used I could feel flex during hard climbs. A few hard shifts caused bent chainrings on Truvativ. These XT's are light, stiff and definitely hold up to alot of abuse. Get these cranks! You won't be disappointed.

Expand full review >>

Favorite Trail:   Fujimi

Duration Product Used:   6 months

Price Paid:    $210.00

Purchased At:   LBS

Similar Products Used:   Truvativ Blaze, FSA's, Shimano Deore.

Bike Setup:   '07 Stumpjumper FSR Elite, XTR groupo, XT cranks, Bomber 140mm fork, King Headset

Overall Rating:5
Value Rating:5
Submitted by justjoshnya a Cross Country Rider

Date Reviewed: October 9, 2008

Strengths:    Stiff. Light. Strong. Good shifting and long lasting chainrings. good bearings, spins with light resistance.

Weaknesses:    bottom bracket seals. water and mud got into mine after a super wet spring and ruined the bearings. However from wat I have read elswhere this is an atribute of all brands of externall bottom brackets. Thats OK it sure makes a noticeable difference in stiffness and the bottom bracket cups are cheap

Bottom Line:   
Killer crank for the dough. Shimano makes the best chainrings by far. THe only other crank i would own would be xtr, if I could afford it.

Expand full review >>

Favorite Trail:   Four Winns, Lake of the Ozarks State Park

Duration Product Used:   1 Year

Price Paid:    $240.00

Purchased At:   Oz CYcles

Similar Products Used:   LX and deore 3 piece splined.

Bike Setup:   Custom built 08 trek fuel ex 8 with full xt drivetrain

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


Reviews 1 - 15 (25 Reviews Total) | Next 15

Review Options:  Sorted by Latest Review | Sort by Best Rating

 




Interbike Featured Booths

Check out the hottest mountain bike products from these brands!



















See All Interbike Coverage - Click Here »

   

MTBR on Facebook