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Do you happen to know what the Q Factor of the Alfine Crankset is? I've looked all over the web and can't find this piece of information. I'm interested in the single chainguard 42T version, and my frame BB shell width is 68mm.

The chainline is specified as 42.7mm which is perfect, right in the middle of my road bike's cassette. But no q-factor is specified.

If you can't provide an exact measurement, what would a likely range be? I'm confortable with a 150mm - 180mm q-factor, so if it falls within this range it's great.

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    If you can find this same photo for a real alfine crankset, then a scale measurement might give a useful number. The photo above shows a triple crankset, and the alfine is a single chainring only.
    – Criggie ♦
    May 4 at 0:03

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Alfine is Tiagra rebranded with a different BCD chainring. It's quiet narrow, hardly clears the chainstays on my Trekking bike with Nexus Hub. I can measure, but it's a bit complicated measurement. I need to figure out how. My informations shows Tiagra has 150mm Q factor.

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    You can take off the left crank arm and mount it 180degrees to take the measurement. The Shimano cranks of this type allow the crank to be slid on at 0 degrees and 180 degrees which is useful for storage of cranksets, i find.
    – Noise
    May 11 at 22:16
  • Just measure from the outer face of the crank arm to the center of the downtube or seat-tube and multiply by 2. Or do it on both sides and add them together, for a more precise result.
    – Robert
    Jun 4 at 18:09
  • If you have calipers then it's simpler. You don't have to eye-ball the center of the tube, because you can include it fully in the measurement and then subtract half its diameter.
    – Robert
    Jun 4 at 18:16

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