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Shimano Deore 2-piece Mountain Bicycle Crank Set - FC-M591

4.8 out of 5 stars 9 customer reviews
| 9 answered questions

Price: $99.99 - $143.99
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  • 2-piece construction Outboard bearings
  • Hyperdrive chainrings with Aluminum outer ring
  • Chaincase compatible
  • W/BB ADAPTER

Product Description

As Mountain Bikes continue to become more diverse, components must evolve. Deore XT addresses the needs of today's riders just like it did when it was first introduced back in 1982 as the world's first MTB group. Revolutionary new designs like the Shimano Shadow rear derailleur complement the the latest evolution of traditional designs to give you the right choice for your riding style. DEORE XT Hollowtech II Cranksets featuring smooth shifting SG-X chainrings, hollow forged crank arms, and integrated pipe billet axles.

Product Details

  • Shipping Information: View shipping rates and policies
  • ASIN: B00UCVT2QA
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (9 customer reviews)
  • Amazon Best Sellers Rank: #586,480 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

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Top Customer Reviews

By D. Torgerson on February 10, 2012
Size: 44/32/22Color: Black Verified Purchase
I bought this for a project bike about 3 months ago and have taken quite a few rides with it now. I feels solid, shifts smoothly, and it's built well as it should be for Deore level. This replaced a medium level Truvativ set and feels more solid and better shifting.

It's definately a pretty decent deal with the included bottom bracket which is EXTERNAL BEARING by the way (it didn't say when I purchased it) with the standard spacers for 68mm openings. The shell (the cylindrical opening on your bike frame where the bottom bracket goes) on mtb's generally is 68 or 73mm so if your shell width (measured side to side thru the cylinder) is 68mm, you'll need to put the spacers (basically plastic washers) on to bring it to 73mm (typically one spacer on non-drive side and two on the drive side) but it explains all of this in the fairly decent instuctions as well. External bearing is the better option in my opinion because the bearing points have a wider stance that translates to better power transfer, less flexing etc. I have both square taper and external bearing on other bikes. The bottom bracket that I replaced with this one was square taper and I definately noticed a difference in flex while riding.

It is pregreased though I used some of my own waterproof grease for the threads etc. I believe it is installable right out of the box, though, with a bead of grease around the shaft openings. You'll need an external bearing wrench or adapter such as Park Tool Bottom Bracket Tool - BBT-19 to tighten the cups. If you are replacing a square taper, it'll work just fine and you'll need some specific tools to get the cranks off and remove the old bottom bracket-I'll list them cause it took me a while to figure out what type I had and what tools I needed back when I started.
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Size: 44/32/22Color: Black Verified Purchase
Bought this to replace the crappy truvativ five D on my commuting bike, wow, what a difference! The front shifting is at least 2-3x smoother than before with no jerking during up-shifting. Almost couldn't feel the shifting action!

Fairly light, about 900 gram, not to mention this crankset looks really cool on the bike as well.

The only downside been the largest chainring is made of aluminum, a few tooth already had wear, and the paint on the largest chainring already chipped during first ride.

***It does not come with chain guard! Only OEM Cranksets sold in bike shops will have chain guardinstalled.
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Size: 44/32/22Color: Black Verified Purchase
I use Shimano parts for all of my 10 bikes, and dependable like this crank.

This crank uses the higher-end product (think LX, XT, and XTR) technology and makes it very affordable. Slightly heavier, but I don't care. When used with Deore derailleurs, it shifts well and is very quiet.

The bottom bracket is very good too, an outboard system that uses different tools, make sure you tighten the pinch bolts to torque specs and I use blue loctite.
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Size: 44/32/22Color: Black Verified Purchase
This is a good, inexpensive crankset for 9 speed drivetrains. Do not buy this thinking it will work for 10-speed, that is a specific crank with specific chainrings. It does not come with the bash guard on the big chain ring, which would be the first thing to remove if it had. It is not a lightweight crank, and should be able to handle a wide range of people and cycling styles. I have it on my bike path bike, and I have no problem getting into the big chainring to hammer, chasing after people on road bikes. The bottom bracket is a good quality one, spinning really easily once installed. It should provide lots of trouble free miles.
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Size: 44/32/22Color: Black Verified Purchase
Don't know why but the 44t ring on mine wore very quickly. I put around 250 total miles on it, probably 100 of those off road the rest on rail trail. The bottom bracket is still going strong though, as are the two smaller rings. I put on a new chain (sram pc 991) and new cassette (sram 970 i think) at same time as this crankset. Maybe the sram chain doesn't give any love to the shimano rings??? Who knows..Other than that I have been totally pleased with it. The bearings still feel very smooth, it was fairly easy to install, and the price is pretty fair. Just make sure you have the proper tools to install it. Park tool bbt-9 worked perfect for installation
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