SBI Pulley Set


The Slackline Brothers Inc. (SBI) Pulleys are a fantastic entry tensioning system. These pulleys come with an integrated brake, which makes them the most economical and easy to use pulley system out there!

This kit comes with one pulley that has an integrated brake (Big Brother) that also has a becket for attaching the rope. It also comes with one pulley without a brake and no becket (Small Brother). These two pulleys combined give you a 4:1 or 5:1 pulley system, depending on how you set them up.

The pulley housing and brake lever are cast from 17-4PH Stainless Steel, which gives the pulleys a tremendously highly breaking strength. The sheaves are made from Delrin plastic, and the axle is made from hardened steel.

The simplicity of these pulleys makes them one-of-a-kind for a longline tensioning system. Their durability makes them able to last for many years. Their interchangeability allows for easy upkeep if you ever need to change out a sheave, axle, or brake.

The SBI Pulleys are a must for any slackliner that wants an easy tensioning system that's portable and works for lines up to 6-8 kN (around 100m - 330 feet).

Assembled in the US.

Updated Design information coming soon.


a - Pulley Length – 157.7 mm (6.21 inches)

b - Pulley Width – 82.3 mm (3.24 inches)

c - Pulley Height – 64.5 mm (2.54 inches)

d - Sheave Diameter – 63.8 mm (2.51 inches)

e - Tread Diameter – 52.6 mm (2.07 inches)

f - Anchor Hole Length – 18.8 mm (0.74 inches)

g - Anchor Hole Width – 18.8 mm (0.74 inches)

h - Anchor Hole Thickness – 8.4 mm (0.33 inches)

i - Becket Hole Length – 18.8 mm (0.74 inches)

j - Bechet Hole Width – 18.8 mm (0.74 inches)

k - Becket Hole Thickness – 6.6 mm (0.26 inches)

Weight – 1,090 g (38.4 oz.) for the Pair of Pulleys

Acceptable Rope Sizes – 11.1 mm (0.44 inches)


MBS – 44.5 kN (10,000 lbf)

WLL – 8.9 kN (2,000 lbf)


Body Material – 17/4PH Stainless Steel

Sheave Material – Delrin

Axle Type – Bushings

In The Box

  • 1x Big Bro SBI Pulley (brake pulley)
  • 1x Small Bro SBI Pulley (non-brake pulley)

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