Hobie Spine for Mirage Drive V2 / GT

Replacement plastic spine for Mirage Drive V2 / GT

A replacement plastic spine for the Mirage Drive V2 or GT. 

Part No: 81181001 

Guidance on spine replacements: 

To replace a spine on your V2 / GT drive, you will need to transfer over the sprockets with fins and fin masts, sprocket shaft with set screw, drum shaft, pedal drums and pedals, idler pulley with shaft and set screw, chains and idler cable. We recommend using new chain and cable nuts when setting up a new spine.

When setting up a new spine it is important to pay attention to chain and cable bias - the aim is to have an equal amount of threads showing past the nuts on chains and cables. This ensures balance across the sprockets so that you do not introduce uneven wear. The chains and cables need to be tensioned so you can gently squeeze in the cables, and they deflect by around 1/4in / 6mm. When tensioned correctly, the drive should not feel stiff to operate. You can check by holding the drive up by one pedal arm, then push the other pedal arm forwards to raise the fins. As you let go, the fins should easily fall and settle in the neutral central position. If they do not, you will need to slacken off the chains a 1/4 turn at a time and re-check until you achieve the correct tension. Check out this handy video from Hobie explaining this, shown on a newer drive system, but the principle is the same.