header image

    BOR Crank XM557 SmartSpindleSystem 1-speed BCD 76 with Chainring

    Item no.:

    Product weight:520g
    477,50 € UVP: 539,00 €
    You save 11,41 %, that is 61,50 €
    including 19% VAT. , no shipping costs
    • available from stock
    Length Crankarms

    Article details

      BOR crank XM557 1X SmartSpindleSystem 1 times LK 76

      The XM557 crank the German manufacturer BOR based on the proven XC666. However, changes and advancements let the weight of the XM557 continue tumbling down. In detail, this means a weight-reduced Lockring that secures the optimized Spider. The crank arms have been calculated once again and could lose a few grams. The arms are mounted on an aluminum shaft with 30 mm diameter to meet even most powerful sprinter with best Steigikeit.
      BOR typically comes also the proven Smart Spindle System is used, which makes it possible to build the crank in almost any context. Furthermore, even the Spider can replace. The crank is therefore prepared for any future changes.

      The CNC machined chainrings BOR aluminum are as always hardened in a special process with a glass mount peening and then anodized with double the usual thickness. This Double Surface Treatment gives the leaves by a significantly increased shelf life!
      The chainrings have specific narrow-wide teeth that prevent the chain may come off.
      In conjunction with a Sram or Shimano Shadow Type2 + derailleur, which have greatly increased bias of the cage, the chain is reliably held in place without chain guide.

      Made in Germany!

      Technical specifications:

      intended use: Cross Country, Marathon, Tour
      Material: alumnium (7022, 7010, 7051)
      Crank arm: 170 mm, 175 mm (165 mm and 172.5 mm on request)
      Shaft: 30 mm diameter
      Q: 164 mm
      Chainring spider: 1-fold with LK 76 mm
      chain line: 49.5 mm
      Bottom bracket: BSA, BB89,5 / BB92, BB30, PF30, BBright MTB, BB386 EVO MTB (optional)
      Chainring: 30, 32, 34, 36 or 38 teeth
      Compatibility chain: 10x or 11x
      Color crank arms: black
      Color Spider / crank bolt: black, orange, red, blue or acid green

      Weights without bottom bracket:

      520g 30 teeth
      525g 32 teeth
      531G 34T
      540g 36 teeth
      553g 38 teeth


      1x cranks
      1x Spider
      1x 1-chainring

      without bottom bracket

      Product weight:520g