Bottom Bracket Confusion

Dazza Doom
Dazza Doom Posts: 50
edited February 2014 in Workshop
Could someone explain this to me?

On the chainset below it recommends a BB of 103mm or 108mm.

Isnt this quite a difference? 5mm. Why choose one over the other?

Chainset info:

FSA Vero Square Taper 9-Speed Chainset

Designed for speed, the Vero crank features AL6061-T6 cold forged solid crank arms mated to a AL7075 T6 stamped chainring. The Vero is compatible with JIS square taper bottom brackets.

FSA Vero Square Taper Chainset Features:

Cold forged AL6061/T6 crank arms
Precision 100% CNC machined AL7075/T6 Outer Ring
AL7075 stamped and CNC machined chainrings
Heat treated chromoly inner chainring
Chromoly chainring bolts
Q-Factor - 143mm
BCD - 130mm (39.53t) or 110mm (36.46t)
Chainline - 43.5mm
Compatible with JIS Square Taper BB’s and power driver BB
Recommended BB – BB-7420 (103mm), BB-8420(108mm)
Black Anodized or Silver Polished
Laser graphics
Weight: 699 g


Any ideas would be great! :)

Comments

  • nicklouse
    nicklouse Posts: 50,675
    BB-7420(103mm) SQ fitting
    BB-8420(108mm) PD fitting

    If you looked up the BB part numbers you could have seen this.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Dazza Doom
    Dazza Doom Posts: 50
    Thanks for the reply, makes sence, but why give specs on a powerdrive BB for a Square taper chainset?

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