12x100 is the standard. That measures between the inside faces of the fork. The axle actually goes outside to outside faces of the fork ends so is longer. Take your 12x100mm axle out and measure it. It may well be around 120mm
aaaaaah thats makes total sense (I'm learning this stuff). Thank you. Will give it a look.
@machomanrandy started
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12x100 is the standard. That measures between the inside faces of the fork. The axle actually goes outside to outside faces of the fork ends so is longer. Take your 12x100mm axle out and measure it. It may well be around 120mm