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What headset do I n...
 

What headset do I need?

 Aidy
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[#13110157]

fork crown race

Picked up these forks on eBay ages ago, and I'd really like to use them. No idea what they were originally for.

By the looks/measurement of it, it's a straight steerer with an integrated crown race. But the crown race is a lot deeper than I'd expect for a standard headset (~6.8mm). I think most bearings would just sit on the top and leave a massive gap underneath, because even the deeper bearings have the same depth of race interface. Does anyone have any suggestions for an appropriate headset?


 
Posted : 10/01/2024 7:54 pm
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Ignore the straight bit of steerer, what’s the diameter across the widest bit at the very bottom, where it meets the crown?


 
Posted : 10/01/2024 8:02 pm
 Aidy
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It tapers from 28.6mm to 38mm. The flat section has a diameter of 49mm


 
Posted : 10/01/2024 8:12 pm
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Sounds like the crown race (that’s possibly missing) would take a pretty standard sized 40mm internal diameter headset bearing. So big bearing at bottom, small bearing at top… ie a tapered headset of some kind.


 
Posted : 10/01/2024 8:19 pm
 Aidy
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Yeah, I thought that at first, but there's nothing for a race to hold onto, and it's angled at 36°.


 
Posted : 10/01/2024 8:26 pm
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That fork has the crown race built in.

What bike did the forks come from?


 
Posted : 10/01/2024 8:27 pm
 Aidy
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What bike did the forks come from?

No idea. Picked them up because they were interesting. ~400mm axle-crown, flat mount, qr, internal dynamo cable routing and crown mounting inserts, if anyone has any clues.


 
Posted : 10/01/2024 8:36 pm
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it’s angled at 36°

Pop a 36 int angle bearing on there and see if it fits then. OD & ext angle will depend on the cup/headtube.


 
Posted : 10/01/2024 9:55 pm
 Aidy
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fork with bearing

Yeah. Tried that. Sits higher up than I think it ought to.


 
Posted : 10/01/2024 10:14 pm
weeksy and weeksy reacted
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Try one with a bigger ID? What’s that one?


 
Posted : 10/01/2024 10:39 pm