what is the difrence betwin 170mm and 175mm?

The difference is the length of the crank arms, where the pedals are attached. 175mm is generally for people around 6 feet tall+ and 170mm is for people shorter than that.

What chain is recommend to use for this? ( 1/2 3/32, etc.) (Not speed. but size.). wanna use on 6speed FW (1/2 3/32size). till upgrade to 9speed .

you cant use a 6speed chain with a 9 speed set up. The width is different

What are the lengths of the crank arms, the title says 175mm and the description 165mm?

It is 175 . Shimano does not produce 165 for this but we have 170mm too (asin#B08BFM5GHH) you can see it at my Amazon store cycle4less.

Shimano Deore 12 Fc M6100 Crankset Black 170mm 30t

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Description

🚴‍♂️ Shift into the future with Shimano Deore’s unbeatable 12-speed crankset!

OPTIMIZED FOR VERSATILITY - Compatible with pressfit and threaded bottom brackets, fitting your bike perfectly every ride.
EFFORTLESS CHAINRING SWAPS - Direct-mount design lets you customize your setup in seconds—stay ahead of the pack with ease.
PRO LEVEL PEDAL EFFICIENCY - 175mm Q-Factor and 170mm arm length engineered for balanced power and ergonomic comfort.
RIGID ALUMINUM CONSTRUCTION - Lightweight yet ultra-stiff two-piece crank arms boost pedaling efficiency and power transfer.
PRECISION 12 SPEED PERFORMANCE - Experience seamless gear transitions with Shimano’s cutting-edge 12-speed drivetrain technology.

The SHIMANO Deore 12 Fc-M6100 Crankset is a high-performance, 12-speed compatible crankset featuring a rigid two-piece aluminum arm design and a direct-mount 30T chainring. Engineered for efficient power transfer and easy customization, it supports both pressfit and threaded bottom brackets, making it a versatile upgrade for serious cyclists seeking reliable, smooth shifting and durability.

Specifications

ASIN	B08BF4R62L
Best Sellers Rank	#495,124 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #526 in Bike Cranksets
Brand Name	SHIMANO
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (3)
Date First Available	June 11, 2020
Item Dimensions LxWxH	12 x 8 x 7 inches
Item Package Dimensions L x W x H	12 x 8 x 7 inches
Item Weight	3.3 Pounds
Manufacturer	Shimano
Material	Aluminum
Model Name	EFCM61001CXA0
Number of Items	1
Package Weight	3.3 Pounds
Part Number	EFCM61001CXA0
Size	170mm/30T
Sport Type	Cycling
Style	Sporty
Suggested Users	mens
Warranty Description	Limited Warranty

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