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How to change from straight to tapered fork?

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How to change from straight to tapered fork?

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flag Fishercraig108
Posted: Sep 11, 2022 at 15:26 Quote
On a 2014 gt sensor 1.0, upgrading the fork to tapered lyrik. I bought a 44/40 ec bottom cup. Upon install, the fram doesn't use cups. The bearings fit directly into the frame. So when I went to press in the cup, it is a mm or 2 to big to slide in. Bc the bearings fit into the frame and there isn't cups....the problem is the the cup is the exact same size as the frame tube, can I sand it down a mm to be able to slide in? Also it seems like the tapered part of the fork slides up in too high and hits into the frame....???? Is there a remedy or a different part? What am I missing here??? Help please
flag Chuvak
Posted: Sep 11, 2022 at 16:43 Quote
if bearings are supposed to be fit directly in the frame, than it means you have integrated headset that does not require cups. unfortunately there is no way to fit tapered fork in 1 1/8" head tube in this case.

about sanding, grinding, sawing and so on: don't. head tube is designed to carry loads only where is does in a stock way, any kinds of modifying can end up with fail on the trail. And tooth surgery is way more expensive than buying a new fork that fill fit your frame
flag ShawMac
O+ FL
Posted: Sep 11, 2022 at 20:25 Quote
In pictures it looks like that bike had a tapered head tube. What diameter is your current steer tube? I have see at least one other bike around that era with a tapered frame but a straight 1.25 steer tube.

If the integrated headset cup in the frame is the exact diameter as the cup you bought, will the 44 bearing you bought not sit directly into the existing integrated cup? (Ignoring for a moment whether they are the same seat angle).

You might need to post some pictures.
flag Reaperactual
Posted: Sep 11, 2022 at 21:21 Quote
I've replaced an intergrated headset on a Buddy's hybrid.

His hybid has a tapered steerer tube and tapered (IS/42, IS/52/40(30*)) headset.
Could have easily fitted a tapered steerer fork on his tapered headtube without fitting the (30*) crown reducer included with the intergrated headset I bought.

As already mentioned a straight intergrated headtube with a 1.5"/40mm diameter steerer PLUS intergrated bearing (or as you've realised an external cup, 44mm bottom section) just won't fit within a standard 42mm inner diameter hole at the bottom.

+1, don't go filing your headtube down to fit that external cup (EC/44/40) headset assembly.
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