You need a reducer crown race. Nukeproof make one for their 1.5” cups to reduce to 1 1/8”
https://www.chainreactioncycles.com/mobile/nukeproof-reducer-crown-race/rp-prod92344

Thought this would only work with a 44mm head tube (which is integrated for 1⅛” and external for 1½”)?

Either Hope or Canecreek .. EC44 external lower.
Hope adds 12mm to stack CC adds 10mm

Fine if its EC44 (44mm ID) but doubt you can’ll find one for a regular 1 1/8″, usually 34mm ID as it’ll foul the fork steerer which is 38mm diameter

Edited

So far as I’m aware there is no adaptor which will allow you to run a tapered fork in a bike with a headtube designed to take a standard 1.125 (1.1/8th) headset.

To make it work, the lower headset cup would have to be enormous (height) to offset the taper and even then, lots of forks have different taper ratios. There is no standard as to how gradual the taper should/must be.

For a specific fork, you could likely have something made, but it would almost certainly raise the bottom of the head tube by 40mm+ And ruin the geometry.

The only way you can do it is with an external bearing cup on the lower like a Hope EC44/40 if you have a 44mm ID head tube.

Slider… the steerer is the bit built into the fork that fits inside the headtube which is the bit built into the frame. The headset is the interface between the steerer and headtube. The vital bit of information is the size of the headtube… we can then tell you if there is a headset that allows you to fit a tapered steerer inside that headtube.

So far as I’m aware there is no adaptor which will allow you to run a tapered fork in a bike with a headtube designed to take a standard 1.125 (1.1/8th) headset.

Well except the ones I listed earlier… but ignore the fact I’ve done it.

To make it work, the lower headset cup would have to be enormous (height) to offset the taper and even then, lots of forks have different taper ratios.

As I said earlier 12mm for Hope and 10mm for CC

There is no standard as to how gradual the taper should/must be.

Depends on your headtube length… All Rockshox alloy are the same … (longest taper) then Fox then rockshox carbon is the shortest taper.

For a specific fork, you could likely have something made, but it would almost certainly raise the bottom of the head tube by 40mm+ And ruin the geometry.

https://photos.app.goo.gl/HBZsEyhn6e1rKG118

Whyte 604

I think that’s a 34mm headtube and takes some kind of integrated headset… so that’ll be straight 1 1/8th steerer only.

Edit: maybe not… looks like the integrated headset is an FSA No.10… which possibly means it’s a 44mm ID head tube… time for you to go and ask Whyte…

I agree with @stevextc

A couple of years ago I bought a newish cube frame of @ton for a bargain £50! Thanks ton! It was a great bike! Before it sacrificed its self for my scandal👍

It never even crossed my mind that it wouldn’t be a tapered steerer as it was a 2017/18 model.

From memory it was internal headset so put in a bottom hope headset mentioned above and kept the original top headset.

I’d be interested to know how you fitted that 44mm headset into a 34mm headtube

The top of the headset fits into the frame and sits 12mm external with a 44mm for a tapered steerer. Hopefully the pictures explain this better.

I ran a pair of genesis tarn rigid tapered forks on the frame.

@The Slider
Still measure it…
I’d even take out the current forks and check they didn’t put in the reducer unless you find someone with a same year 604. It wouldn’t surprise me if they just used the same headtube but fitted the reducer.

Both Hope and CC have very detailed measurements on their websites. I’ve known people take the CC one which is longer inside and file/linish off 1-2mm… (on kids bikes)

I just ordered it and checked once it was in my hands… if it hadn’t fit I’d have just returned it.

it’s this one?
https://www.ebay.co.uk/itm/Whyte-604-Custom-Built-Mountain-Bike-Rockshox-Recon-Air-forks-Sram-27-5-Fat-Tyre/392932366719?hash=item5b7c98197f:g:AvEAAOSwwBZfVKuj

it’s using a lower EC44 cup to fit the tapered forks.

don’t think the bike was designed that way, it takes an internal headset, but there’s enough headset cup insert for an EC44 so it will work, albeit slacken the geometry by half a degree or so.

At the time I posted, we didn’t know the bike

Exactly, so Steve wasn’t wrong. He was responding to:

So far as I’m aware there is no adaptor which will allow you to run a tapered fork in a bike with a headtube designed to take a standard 1.125 (1.1/8th) headset.

ZS44 is designed to take a standard 1″ 1/8 headset, it’s just a different standard to external.

A 44mm heatube is a recognised standard for tapered forks.

Semi-integrated came along years before tapered was even a thing, around the same time as Onepointfive. It’s possible to convert them but that’s not the same as being designed to run them. The design intent is that they run bigger head tubes and zero stack. Probably before Steve got his XTC.

The design intent is that they run bigger head tubes and zero stack. Probably before Steve got his XTC.

Don’t even go there into OD and OD2..

THE headset standard was external cup 1.1/8th.

Emphasis being on was, once semi integrated and integrated came out it was anyone’s game. Even my hybrid has a ZS44 straight steerer.

Anyway, this is a stupid argument I have no idea why I started, I’m outta here.