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Old 09-21-16, 08:58 AM
  #18  
FBinNY 
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Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,968

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

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FWIW - I suspect that your fork was designed as a 96mm that used the tension caused by spreading to hold the wheel in the event the nuts or QR were loose. The original hubs were also 100mm, and the locknut faces had a small inner lip that stuck out about 1/16".

If you look closely, you might see that the slot isn't a simple U, but more like a keyhole. The axle slides into the slot and the fork is sprung so the lips in the face latch in the wider area.

This design was implemented to meet the CPSC requirement for secondary retention in the event the nuts were loose.

Obviously, you lose this retention feature with a new wheel, but by the same token, little effort is needed to spring the fork open to mount a 100mm wheel.

I point this out to let you know that there's no need to pay someone to spread your fork. Of course you may if you prefer, or can do it yourself, but it isn't necessary.
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