Product parameters

Brand: BOLANY

Name: Hollow integrated crank

Compatible: 8/9/10/11/12s

BCD: 104

Total crank weight: 750g

Shaft outer diameter: 24mm

Material: Aluminum alloy

Length: The distance between the two holes is 170mm

Color: Yellow/Blue/Red/Black

.axle chrome molybdenum steel

  »improve the stability of the crank and the hollow shaft,and improve the performance.

.fine finishing tooth pattern

  »adopt multi-stripe fixing method,make the crank force more direct.

  »crank is widened and thickened, making it stronger and more durable

.Internal weight reduction design

  »Make cranks lighter

  »CNC hollow processing

  »The die-casting process is adopted to make the aluminum alloy more dense in hardness, lighter in weight and higher in strength

.Precision thread

  »Make the texture smoother without burrs

Using positive and negative toothed discs

The chain is more stable and less likely to fall 34T / 36T two options

Bottom Bracket

BB91 Threaded Bottom Bracket

>Built-in bearing High degree of lubrication

>Smooth pedaling Reduce noise

>Aluminum alloy washer*3

The original length of the Bottom is 68mm, and it is 110mm after telescopic.

Hollow thread screw-in

Reduce noise, Improve rigidity, and the sealing system is easy to store

screw thread bottom。

Aluminum alloy body, inner diameter 24mm, Weight about 92g, Specification: Suitable for frame bottom bracket 68-73mm, Tooth pattern BC1.37-24T.

The bottom is equipped with 3 aluminum alloy washers, Which are more durable and less deformable than the previous plastic washers.

68mm (Road bike bottom bracket) Add 1 washer to the right

68mm (Mountain bike bottom bracket) Add 2 washers on the right and 1 washer on the left

73 mm(Mountain bike bottom bracket) Add 1 washer on the right.

A variety of colors to choose from

Black / Yellow / Blue / Red

Anodized

Brighter and more colorful

Prevent oxidation, Effectively protect the aluminum alloy body, Long-term use will not fade.

Complimentary installation tools+Disk nails*4