The wheel revolution1060 grams thanks to fibre spokes

Peter Nilges

 · 28.04.2018

The wheel revolution: 1060 grams thanks to fibre spokesPhoto: Peter Nilges
The wheel revolution: 1060 grams thanks to fibre spokes
The idea of flexible spokes is not new, but Pi Rope's new approach promises record weights with very good stiffness and durability. So we can be excited.
  The complete wheelset with a 25 millimetre wide Newmen aluminium rim should weigh just 1193 grams (27.5 inch) or 1236 grams (29 inch).Photo: Peter Nilges The complete wheelset with a 25 millimetre wide Newmen aluminium rim should weigh just 1193 grams (27.5 inch) or 1236 grams (29 inch).

What the Chemnitz-based company Pi Rope is promising sounds too good to be true and is likely to generate real enthusiasm, especially among lightweight construction fans. In collaboration with the Chemnitz University of Technology, a synthetic fibre spoke has been created that should put conventional spokes in the shade by far.

  One sticking point was the connection between the fibre spoke and the aluminium nipple.Photo: Peter Nilges One sticking point was the connection between the fibre spoke and the aluminium nipple.

The flexible fibre spoke is woven from a Vectran yarn and is said to offer the following advantages:

  • High load capacity: spoke breakage is almost impossible
  • Five times lighter than steel: only 2.2 grams per spoke
  • Better damping of vibrations
  • Same stiffness values in the assembled impeller
  • High resistance to ageing and weathering
  • Very high durability on the test bench
  The Pi Rope wheels will be available exclusively with Newmen rims and special Newmen hubs.Photo: Peter Nilges The Pi Rope wheels will be available exclusively with Newmen rims and special Newmen hubs.

The Pi Rope wheels will be available exclusively with hubs and rims from Newmen Components. The spokes can also be coloured. Three different wheel sets are initially planned.

RaceLine One X.A.25 (XC to trail use)

  • Aluminium rim with 25 mm inner width
  • 27,5" = 1193 g
  • 29" = 1236 g
  • Price: 1199 Euro

RaceLine One A.30 (All Mountain to Enduro)

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  • Aluminium rim with 30 mm inner width
  • 27,5" = 1445 g
  • 29" = 1513 g
  • Price: 1048 Euro

XC wheelset with carbon rim

  • Carbon rim with 22 mm inner width
  • 29" = 1060 g
  The flexible spoke is braided from yarn and weighs less than half as much as a lightweight steel spoke (Sapim CX Ray 4.6 grams). A spoke weight of only 2.2 grams makes it possible to build very light wheels.Photo: Peter Nilges The flexible spoke is braided from yarn and weighs less than half as much as a lightweight steel spoke (Sapim CX Ray 4.6 grams). A spoke weight of only 2.2 grams makes it possible to build very light wheels.

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