Shimano Deore 2-piece Mountain Bicycle Crank Set - FC-M591
|Price:||$99.99 - $143.99|
- 2-piece construction Outboard bearings
- Hyperdrive chainrings with Aluminum outer ring
- Chaincase compatible
- W/BB ADAPTER
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Top Customer Reviews
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.Read more ›
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.
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.
Most Recent Customer Reviews
I recently bought a Surly Cross Check frame on craigslist and wanted to put it together like a touring bike. This crankset and BB worked great. Read morePublished on December 17, 2013 by Devin Farrelly
Been mountain biking with this crankset since I bought it more than a year and a half ago and haven't had any problems.Published on December 6, 2013 by Allen Rishel
Perfect replacement on my old DBR full suspension race bike. I 'abuse' my mountain bike in all kinds of weather and conditions. Read morePublished on March 3, 2013 by TeresaHallwood