• Could that explain nearly 4mm sitting out?

    No, mine is less than 0.5mm per side over the nominal length, so that's how far out the chainline/Q-factor would be.

    I've mine here I only have a basic caliper to measure but if you send me how to measure I'll do it and post results :)

    For an ISO spindle, the measurement should be 12.60mm across the flats measured 2mm inboard of the axle end (according to Sheldon Brown). You should be well onto the flats by then, I had to do some maths because my axle is short and chamfered too, and the JIS measurement is supposed to be 12.65mm at the very tip; at 51.5mm off centre on my "103mm" axle, I'd have been measuring air.

  • With these metal calipers I'm getting over 13mm at the extreme of axle end, 13.1mm by the 2mm inboard of axle end, it's greater than 14mm by the fat bit.

  • With these metal calipers I'm getting over 13mm

    I can't imagine that anybody has ever sent an axle out of the factory which is that far over spec. Check your calibration, if you have any known cartridge bearings to hand they are a decent standard which will get you pretty close, the OD of the outer race for bicycle sizes will be nominal plus 10-20μm

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