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#594045 - 04/08/15 2:13 pm Headstock bearings  
Joined: Dec 2014
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Treforissa Offline
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Treforissa  Offline
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Posts: 24
Llangollen, North Wales
Hi, Converting my C15 with different forks and need to change the headstock bearings. Machining up top and bottom bearing holders but my question is.... What are the best type of bearing to use? Plain roller or taper roller. Or is there any other ideas. I'm all ears.

Cheers


1958 Tiger Cub
1959 C15
1960 C15
2014 Triumph Bonneville America
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#594069 - 04/08/15 5:16 pm Re: Headstock bearings [Re: Treforissa]  
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Shane in Oz Online content
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Shane in Oz  Online Content
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Sydney, Oz
Tapered roller if you can get them in the right dimensions.

SRM sells tapered roller bearings as a straight replacement for the pre-OIF unit singles and twins, but they may not fit the new shaft. If you have the gear you could build up / machine the shaft to size.

#594088 - 04/08/15 7:29 pm Re: Headstock bearings [Re: Treforissa]  
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Tridentman Online content
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New Jersey USA
Historically almost all steering head bearings were of the cup and cone type.
Then came the use of tapered roller bearings (but never parallel roller bearings at least in general use).
Now some of the modern Japanese machines have reportedly gone back to cup and cone bearings.
The reason is that the tapered roller bearing rollers have a larger diameter than the cup and cone type balls. In the steering head application the handlebars are normally in the straight ahead position or just a little to each side of it.
This small movement gives plenty of rotation on the small balls but very little on the much larger taper rollers. This can cause the surface of the taper roller to "Brinell" and the surface of the taper roller to crack up.
Certainly on a C15 I would have thought that the original cups and cones would be perfectly satisfactory.

#594159 - 04/09/15 11:43 am Re: Headstock bearings [Re: Treforissa]  
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DMadigan Online content
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DMadigan  Online Content
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The load on the lower bearing is both radial and axial. The top bearing is mostly radial so a taper bearing on top is overkill.

#594206 - 04/09/15 4:40 pm Re: Headstock bearings [Re: Treforissa]  
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GreenMonster Offline
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GreenMonster  Offline
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NH
Tapered bearings upper and lower.

Their is reason modern machines use these.


Never Allow The Radical Views Of The Few To Infringe On The Constitutional Rights Of The Many
#594280 - 04/10/15 8:31 am Re: Headstock bearings [Re: Treforissa]  
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GreenMonster Offline
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GreenMonster  Offline
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NH
The original ? was was are the (best) type of bearings to use?

Okay we know that that application is the fork yokes.

Tapered roller bearings do a much better job at handling the stresses that are exerted at the neck than ball bearings.

Straight roller bearings????

They fit ball bearings because they are cheap. Not because they are optimal choice for that application.

But what the hell do I know i'm just a stupid wrench not a mechanical engineer.


Never Allow The Radical Views Of The Few To Infringe On The Constitutional Rights Of The Many
#594477 - 04/11/15 4:05 pm Re: Headstock bearings [Re: Shane in Oz]  
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Hambone Offline
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Hambone  Offline
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Originally Posted By Shane in Oz
Tapered roller if you can get them in the right dimensions.

SRM sells tapered roller bearings as a straight replacement for the pre-OIF unit singles and twins, but they may not fit the new shaft. If you have the gear you could build up / machine the shaft to size.


I too am considering this head stock bearing conversion for my 1969 A65 and as you say Shane they may not fit? I believe I once read where the headlight ears don't quite seat right after conversion leaving a gap at the top. Am I correct in assuming that would be the case if I installed the SRM straight replacement? Or have they solved that issue? I am fine with the balls and cups but not the pain of installing them!! any advice would be great Thanks.

Last edited by Hambone; 04/11/15 4:19 pm.
#594554 - 04/12/15 5:08 am Re: Headstock bearings [Re: Hambone]  
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Shane in Oz Online content
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Shane in Oz  Online Content
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Sydney, Oz
I think they fit standard bikes alright, but the OP was considering fitting non-standard forks.

I read ages ago that the SRM taper roller steering head bearings are off the shelf bearings of the right thickness, and SRM grinds the OD of the cup and / or ID of the cone to fit BSA steering heads.
Of course, that may just have been press release hype.

I bought a set of SRM tapered roller steering head bearings on special from Walridge Motors, but they were held up in Customs for ages so I haven't fitted them yet.

#594558 - 04/12/15 5:52 am Re: Headstock bearings [Re: Hambone]  
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Allan Gill Offline
Allan Gill  Offline



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Rotherham - S. Yorkshire
Originally Posted By Hambone
Originally Posted By Shane in Oz
Tapered roller if you can get them in the right dimensions.

SRM sells tapered roller bearings as a straight replacement for the pre-OIF unit singles and twins, but they may not fit the new shaft. If you have the gear you could build up / machine the shaft to size.


I too am considering this head stock bearing conversion for my 1969 A65 and as you say Shane they may not fit? I believe I once read where the headlight ears don't quite seat right after conversion leaving a gap at the top. Am I correct in assuming that would be the case if I installed the SRM straight replacement? Or have they solved that issue? I am fine with the balls and cups but not the pain of installing them!! any advice would be great Thanks.


Factory photo where the headlight brackets do not meet up with the top yoke.



Taper rollers are a good upgrade in my opinion.

Last edited by Allan Gill; 04/12/15 5:54 am.

beerchug
#594813 - 04/13/15 7:20 pm Re: Headstock bearings [Re: Treforissa]  
Joined: Dec 2014
Posts: 24
Treforissa Offline
BritBike Forum member
Treforissa  Offline
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Joined: Dec 2014
Posts: 24
Llangollen, North Wales
Gone for taper roller. Machining up new bearing holders to fit the C15 headstock. Thanks for the help guys.


1958 Tiger Cub
1959 C15
1960 C15
2014 Triumph Bonneville America

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