Other 1.8” Crown Race

[RichP]

Good morning all,

Prior to posting this new thread I’ve trawled through multiple other looking for an answer to this simple question.

I own a 2024 Rail 9.5 and bought a pre owned Zeb fork as an upgrade, but when I came to swap over the original fork crown race I found it was too small to fit over the steerer.

Spec from Trek Website:
OCLV Mountain Carbon main frame, 1.8'' lower head tube.

On further investigation I noticed that the original fork steerer diameter was 1.5” and the crown race had a larger land that effectively reducing the inner diameter and converting the 1.5” steerer to accommodate a 1.8” bearing. All very confusing and annoying as the Bike Spec states it has a 1.8” bottom steerer bearing, and so you would have thought the fork would also have a 1.8” crown race.

So naturally I’ve search the Interweb for a replacement and have only found one on the Trek Website, trouble is they have no stock.

Trek 2022 Rail 9.9 / 9.8 29 1.8˝ Lower Headset Crown Race - Trek Bikes (GB)

Enhance your cycling experience with Trek 2022 Rail 9.9 / 9.8 29 1.8

www.trekbikes.com

Does anyone have an idea where I can find one of these as currently I can’t fit the new shock.

Thanks

 

[#lazy]

I got a trek bigger zeb fork but I’ve put a 27.5 lower on it , easy to swap though ……yours for £20

 

[RichP]

Hi,

No, the new fork has a 1.8” bottom steerer diameter.

 

[RichP]

I got a trek bigger zeb fork but I’ve put a 27.5 lower on it , easy to swap though ……yours for £20

Sorry pal, no idea what you mean…are you offering me a 27.5” compatible Zeb fork with a 1.8” lower tapered steerer diameter? Does the fork have a 1.8” crown race attached? If not I’m in the same situation, but with a fork that needs modification back to 29er?

Can you elaborate please?

 

[#lazy]

I bought a 29 zeb fork but the seller forgot to mention it’s only compatible with the trek fatter 1.8 crown and refused a refund stating I didn’t ask , so I used the 29 lowers on my 27.5 crown and so have a spare Trek 1.8 tapered fork with 27.5 lowers which are completely effing useless to anyone as Trek don’t make 27.5 bike anymore !
If it confused you , that’s exactly what I felt like for weeks trying get it sorted out
Tbh you can have them for free as I’d be glad to get them outta my life

 

[RichP]

I bought a 29 zeb fork but the seller forgot to mention it’s only compatible with the trek fatter 1.8 crown and refused a refund stating I didn’t ask , so I used the 29 lowers on my 27.5 crown and so have a spare Trek 1.8 tapered fork with 27.5 lowers which are completely effing useless to anyone as Trek don’t make 27.5 bike anymore !
If it confused you , that’s exactly what I felt like for weeks trying get it sorted out
Tbh you can have them for free as I’d be glad to get them outta my life

 

[RichP]

#lazy…I feel your pain mate. That’s exactly what happened to me! But unless the fork has a 1.8” crown race fitted on the steerer I’m buggered because my old forks had a 1.5” OD on the bottom steerer with a 1.5” to 1.8” converter crown race so that they fit in the oversize Trek head tube. I need a 1.8” crown race and can’t find one anywhere!

This specifically

Trek 2022 Rail 9.9 / 9.8 29 1.8˝ Lower Headset Crown Race - Trek Bikes (GB)

Enhance your cycling experience with Trek 2022 Rail 9.9 / 9.8 29 1.8

www.trekbikes.com

 

[RichP]

#lazy…I feel your pain mate. That’s exactly what happened to me! But unless the fork has a 1.8” crown race fitted on the steerer I’m buggered because my old forks had a 1.5” OD on the bottom steerer with a 1.5” to 1.8” converter crown race so that they fit in the oversize Trek head tube. I need a 1.8” crown race and can’t find one anywhere!

This specifically

Trek 2022 Rail 9.9 / 9.8 29 1.8˝ Lower Headset Crown Race - Trek Bikes (GB)

Enhance your cycling experience with Trek 2022 Rail 9.9 / 9.8 29 1.8

www.trekbikes.com

 

[#lazy]

Oh well , I put it at the back of shed and forgot all about it until now and it’s winding me up again
It didn’t come with the crown race so can’t help you

 

[Jackware]

Would this solve it?

Acros ZS66 Headset Lower 1.8'' | By Acros

This Bearing 'set' consists of a lower stainless heasdset bearing inserted into a lower aluminium cup and supplied with a crown race. This is an original Acros productAcros Part Ref: 44.02.700ZS66/46/OD72Stainless steel angular contact ball bearings Key Features• Weight: 70g• Fork steerer: 1.8"...

www.kineticbikebearings.com

 

[RichP]

Oh well , I put it at the back of shed and forgot all about it until now and it’s winding me up again
It didn’t come with the crown race so can’t help you

Thanks anyway mate…much appreciated!

 

[RichP]

Would this solve it?

Acros ZS66 Headset Lower 1.8'' | By Acros

This Bearing 'set' consists of a lower stainless heasdset bearing inserted into a lower aluminium cup and supplied with a crown race. This is an original Acros productAcros Part Ref: 44.02.700ZS66/46/OD72Stainless steel angular contact ball bearings Key Features• Weight: 70g• Fork steerer: 1.8"...

www.kineticbikebearings.com

I can’t be sure…the title says 1.8”, but the description says 1 1/8”. I might give them a call and ask. Thanks for taking the time to try and help out though.

Regards

 

[Jackware]

I can’t be sure…the title says 1.8”, but the description says 1 1/8”. I might give them a call and ask. Thanks for taking the time to try and help out though.

Regards

No problem, whenever I see a post where someone can't find an item I take the challenge
The measurement shown, 45.8mm, equates to 1.8" not 1 1/8" so figures crossed.

 

[RichP]

No problem, whenever I see a post where someone can't find an item I take the challenge
The measurement shown, 45.8mm, equates to 1.8" not 1 1/8" so figures crossed.

That’s what I thought!

 

[RichP]

No problem, whenever I see a post where someone can't find an item I take the challenge
The measurement shown, 45.8mm, equates to 1.8" not 1 1/8" so figures crossed.

I ordered one anyway, I’ll buy you a pint if it fits!

 

[jaumebtt]

Good morning all,

Prior to posting this new thread I’ve trawled through multiple other looking for an answer to this simple question.

I own a 2024 Rail 9.5 and bought a pre owned Zeb fork as an upgrade, but when I came to swap over the original fork crown race I found it was too small to fit over the steerer.

Spec from Trek Website:
OCLV Mountain Carbon main frame, 1.8'' lower head tube.

On further investigation I noticed that the original fork steerer diameter was 1.5” and the crown race had a larger land that effectively reducing the inner diameter and converting the 1.5” steerer to accommodate a 1.8” bearing. All very confusing and annoying as the Bike Spec states it has a 1.8” bottom steerer bearing, and so you would have thought the fork would also have a 1.8” crown race.

So naturally I’ve search the Interweb for a replacement and have only found one on the Trek Website, trouble is they have no stock.

Trek 2022 Rail 9.9 / 9.8 29 1.8˝ Lower Headset Crown Race - Trek Bikes (GB)

Enhance your cycling experience with Trek 2022 Rail 9.9 / 9.8 29 1.8

www.trekbikes.com

Does anyone have an idea where I can find one of these as currently I can’t fit the new shock.

Thanks

fsa-crown-race-1-8-to-1-5-reducer

 

[Jackware]

fsa-crown-race-1-8-to-1-5-reducer

Nope, his fork's steerer tube diameter is 1.8 not 1.5.

 

[RichP]

That’s what I thought!

View attachment 143754

For future reference I managed to purchase a race through my LBS direct from Trek….fits like a glove to a chicken’s lip and the fork is fitted!