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Fitting Tapered Fork onto Giant Hybrid with Overdrive head tube.

1490 Views 4 Replies 3 Participants Last post by  seitenryu
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Have gotten a spare Giant Escape 2020
hybrid and in the process of building it up. On the website it mentions it has overdrive headtube dimensions.

It comes with a heavy steel front fork and I can get a carbon fork for cheap. The carbon fork is tapered.

I have removed the lower headset components (including the cup that's pressed into the headtube and now its looking like it's an integrated headset, I have gone through multiple sites but have yet to determine if there is any way to get a tapered 1 1/8 - 1.5 to fit into the head tube. The top of the fork slides through the existing top headset with no problem. I can re-use the top bearings and all the etc components. It is the bottom which I am not sure of.

Testing of a similar tapered fork from another bike allows it to sit nicely on the headtube but I have yet to figure out what's the proper interface / bearing at the bottom that allows it to function properly (if it's even possible)

Measurements show a 47mm OD (pic edited. dimensions confirmed) and a 42mm after the "beveled edge"

Added the fork dimensions for reference

Is it even possible to fit this fork and what is the lower headset components I should be looking at to get this to seat properly?

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You say the bottom bearing seat is 47mm and your drawing says it's 46mm. What about 46.85mm? Also, what is the OD of the steerer tube at fork crown?
47mm would be 1-1/8<-->1-3/8 tapered. An oddball one. There are external 1.5" cups that fit that, but it doesn't look like your frame has enough depth. We need a bit more info, with the original fork diameters and both headtube inner diameters.
Ok i've been trawling the net for 3 days and it looks like im out of luck

There seem to be a hint of FSA making IS47/40 bearing before they stopped doing that so theres no way for this conversion to work.

All request for converters have come to a dead end.

UNLESS i'm prepared to do some machining and bond a spacer + convert to an external EC44 which will allow me to mount the 1.5" fork

So im stuck with looking for a CF 1-1/8 straight fork with flat mount disc caliper (I think most are out of production and those that are available are kindda expensive)

But realistically speaking, I should just offload this bike and get a frame which is more build friendly.

The D-shaped seatpost,the strange head tube dimensions coupled with the 135mm QR and disc setup is throwing me off trying to polish a turd.

Thanks for any help though!
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Ok i've been trawling the net for 3 days and it looks like im out of luck

There seem to be a hint of FSA making IS47/40 bearing before they stopped doing that so theres no way for this conversion to work.

All request for converters have come to a dead end.

UNLESS i'm prepared to do some machining and bond a spacer + convert to an external EC44 which will allow me to mount the 1.5" fork

So im stuck with looking for a CF 1-1/8 straight fork with flat mount disc caliper (I think most are out of production and those that are available are kindda expensive)

But realistically speaking, I should just offload this bike and get a frame which is more build friendly.

The D-shaped seatpost,the strange head tube dimensions coupled with the 135mm QR and disc setup is throwing me off trying to polish a turd.

Thanks for any help though!
With the current parts situation, yeah, might be best to pull the plug on that project. It's super frustrating when they make decisions like that. Good luck!
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