Shimano

SLX Dyna-Sys FD-M660 10spd Crankset w/Bottom Bracket

The Shimano SLX Dyna-Sys M660 Mountain 10 Speed Hollowtech II Crankset features a composite middle ring for double the service life, improved shifting performance, and a reinforced construction for a rugged riding style.

• Black color rings in 64/104mm bolt circle diameter
• Middle chainring has steel teeth mounted to a composite carrier, steel inner ring
• Composite middle ring provides smooth shifting and long service life
• Works with Shimano 10spd Mountain only

Confused about bottom bracket standards and what it is you need? Here's a comprehensive look at the subject: The Bottom Bracket (Un)Standard blog post.