Shimano Deore T521 Chainring

SHIMANO – OCTALINK – HOLLOWTECH – MTB Crankset – 3×10-speed

– Based on the premium SHIMANO DEORE XT and DEORE LX trekking product line, the FC-T521 offers 3×10 speed gearing and uses an OCTALINK bb interface. It includes an integrated chain guard.

Features:

– 10-speed Trekking crankset
– Following XT/LX trekking product concept
– Stable and smooth shifting performance
– Simple and sturdy design
– Integrated appearance of chain guard
– Rigid and lightweight by HOLLOWTECH, OCTALINK

Specifications:

– Axle length of BB-UN/ ES (mm)_Threaded (chain case): 121-AK
– Axle length of BB-UN/ ES (mm)_Threaded (normal): 121-AK
– Arm adapter: Yes
– Chain case compatible: Yes
– Chain line (mm): 50
– Chain ring combination: 48-36-26T, 44-32-24T
– Compatible BB type_Octalink: Yes
– Compatible chain: HG-X 10-speed
– Crank fixing bolt included: Yes
– Crank arm length (mm)_170.0: Yes
– Crank arm length (mm)_175.0: Yes
– Gear arms: 4
– HOLLOWTECH crank arm: Yes
– OCTALINK technology: Yes
– Optional chain guard_With chain guard: Yes
– Optional chain guard_Without chain / bash guard: Yes
– P.C.D. (mm): 104/64
– Rear speeds: 10
– Recommended BB_Threaded (normal): BB-ES300
– Stainless chain guard fixing bolt: Yes
– Threaded BB shell width_68mm: Yes
– Threaded BB shell width_73mm: Yes
– Q-factor (mm): 185.8

Technology:

HG-X Chain:
– Further evolution of shifting performance
– A directional mountain bike specific 10-speed HG-X chain means smoother shifts, lighter weight and greater overall performance.
– HG-X directional chain: Outer side is optimized for front shifting and inner side is optimized for rear shifting.

OCTALINK:
– Compared the power transfer of OCTALINK with the conventional square taper spindle, the 8-splined OCTALINK interface that connects bottom bracket and crank set increases the strength and rigidity for entire assembly.

HOLLOWTECH Crank Arm:
– Hollow forged crank arms
– A lightweight crankset not only reduces the bike’s weight, but decreases rotating mass to aid in acceleration.
– The challenge is to reduce the weight of the crank without reducing its strength and rigidity.
– SHIMANO’s advanced forging technology has solved the problem through the HOLLOWTECH crank.
– Just like high quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very lightweight.