Service Guide

Gulo's innovative approach

Replacing a Spoke

Tools Needed

  • Park Tool SW-15 or SW-17 (5mm hex nipple tool)
  • Blue Park Tool SW-3 blue spoke wrench (3.96mm)


  1. Remove the tire and rim tape.
  2. Clean rim surface with rubbing alcohol.

If replacing a spoke, simply unscrew the damaged spoke from the hub using Park Tool SW-3 or Birzman Gold spoke wrench as a helper to break the thread lock. 

On new spoke, apply low strength threadlock to both spoke end threads. We advise using a low strength threadlock good for vibration environments, such as Vibra-tite VC3, on both the hub and rim side of the spoke to prevent de-tensioning.  See our product page for purchase of proper threadlock. Thread on the Gulo G1 hidden nipple approximately 5 turns.  Insert new spoke through rim hole in line with spoke hole at the hub.  Thread new spoke completely into the hole in the hub shell.  Do not force threads to start, as this may damage the spoke and/or hub.  Back spoke out approximately 1/8-turn until there is a small amount of free play between spoke and hub.  At this point you are ready to start tensioning the new spoke. 

Using the Park Tool SW-3 blue spoke wrench as a spoke holder, hold the spoke from the ferrule up at the rim.  EXTREMELY IMPORTANT: DO NOT HOLD THE SPOKE FROM THE FERRULE AT THE HUB SIDE OR ALLOW THE SPOKE TO TWIST IN ANY WAY WHILE TENSIONING! Any torsional force (spoke windup) about the central axis of the spoke will cause damage and premature failure of the spoke.  If you have built wheels with bladed spokes and a bladed spoke holder, it is the same process.

Using Park Tool SW-15 or SW-17, begin turning the hidden nipple while holding the spoke in place with Park Tool SW-3 or Birzman Gold spoke wrench to prevent the spoke from turning. 

Continue to tension the spoke in this manner until the wheel is brought back to true. If you have a tensiometer, tensions should be around 120kgf (front non-drive, rear drive-side). We use the iGaging tensiometer sold by WheelFanatyk. See our tension calibration chart for the appropriate tensioning information.

140 63 0.49
160 73 0.44
180 82 0.40
200 91 0.36
210 95 0.35
220 100 0.34
230 104 0.33
240 109 0.32
250 113 0.315
260 118 0.31
270 122 0.30
280 127 0.29
290 132 0.28
300 136 0.27

Gulo Spoke Length Chart

Spoke length chart

Gulo Wheelset Series

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