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post #1 of 47 (permalink) Old 05-23-2011, 01:44 AM Thread Starter
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Headstock bearing conversion help needed

In the process of replacing the steering bearings on my 08 speed 1050 and I've gotten all the old parts out. My intention is to replace the ball bearings with tapered ones. My thinking was I'd just measure the inside and outside diameter of the assembled bearings and get a set of tapered bearings to match.however... The races were compromised during removal and I'm not sure if I could get an accurate reading with a mic. I know even several thousandths of an inch could be a big deal here. Does anyone have the measurements I'd need? Or would it be possible to use the numbers on the bearings to cross reference to a tapered set? Insight appreciated.
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post #2 of 47 (permalink) Old 05-23-2011, 02:04 AM
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Don't know how easy it would be, but a search of this site will lead to the numbers.
or
I don't remember exactly, but the numbers might be referenced in the thread I linked to in an earlier post.
or
Order them from AllBalls. They have a listing for most ball to tapered headstock bearing swaps.

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post #3 of 47 (permalink) Old 05-23-2011, 04:20 AM
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Bottom is a 30/55/17 - top is 25/52/15

+1 on AllBalls - you get kit complete with dust seals

Yes incidentally, you can use the bearing #'s to get the dimensional info then look up Tapered Roller equivalent
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post #4 of 47 (permalink) Old 05-23-2011, 12:01 PM
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Once you get this squared away, pls post the All Balls part nos. The '08 has that funky top sealed ball bearing and I never found a tapered bearing equivalent. The All Balls kit I saw I "believe" was for an older model bike with conventional steering bearings, and contained 3 bearing? I didn't pursue it very far because my bearings are still pretty new, but I'll be interested in what you find out.
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post #5 of 47 (permalink) Old 05-23-2011, 12:10 PM Thread Starter
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Thanks for the info.

I did some searching and found measurements for a Bonneville, but wasnt able to find anything related to the speed. DeCosse... are those measurements in millimeters? I assume it is OD/ID/height?

I'd love to go witha kit from allballs or something similar, I just assumed they would have OEM replacements only. In other words...another set of ball ebarings but not tapered like I'm wanting. Will look into that further.
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post #6 of 47 (permalink) Old 05-23-2011, 12:20 PM
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You are misunderstanding the AllBalls recommendation. I suppose if you specified ball bearings they would provide those. But if you order tapered bearings, that is what you will get.

http://www.allballsracing.com/

Click on the fork conversion clicky at right side of page.

For example, I did a fast look see and came up with 25 id x 52 od x 16.5 w pn 30205J-5 for the top bearing. Info is listed for the bottom bearing to the right of that.

Based on Equito's comment, it would be prudent to call and speak with them direct and mention his question. Not saying that this is the case, but this would not be the first time a vendor makes a listing error and the rest of the vendors faithfully copy that error for posterity.

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Last edited by oldndumb; 05-23-2011 at 12:24 PM.
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post #7 of 47 (permalink) Old 05-23-2011, 01:15 PM
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While unsure of the '08 Speed III, I have been researching steering head T/Bearing replacements for my own '02 Daytona 955i.

@oldndumb: You are correct. The top T/Roller Bearing 25x52x16.5 is a standard size in T/Roller terms. Unfortunately it will not allow the OEM top bearing cover/cup/seal to seat neatly, thereby preventing the ingress of water and dust. It is therefore important to buy a narrow section 15mm T/Roller bearing which will allow the OEM top bearing cover/cup/seal to seat completely. From what I have read, the http://www.allballsracing.com/ kit does not allow for this.

In similar fashion, the bottom T/Roller must seat on a 55mm dust seal. I believe such a seal is available from Triumph Part No. T3600234.

See Here:

http://www.worldoftriumph.com/sectio.../parts_locator http://www.worldoftriumph.com/product.php?xProd=31856

Alternatively, Koyo manufacture a suitable T/Roller Bearing with an Integrated oil seal.

Here are the Koyo part numbers:

Top T/Roller: Koyo 30205JR 25x52x15 Narrow Section T/Roller Bearing
Bottom T/Roller: Koyo 32006JRRS 30x55x17 T/Roller Bearing [Includes Integrated oil seal]

My attempts to obtain here in South Africa these exact Koyo Bearings have proved utterly fruitless. Hopefully you will have better luck. Have a look here:

http://www.ebrbearings.co.uk/index.p...productId=2010

http://simplybearings.co.uk/shop/p43...duct_info.html

Finally, I see that the UK-based http://www.triumph-online.co.uk have a complete T/Roller Bearing Conversion kit and Seals kit available. The problem is they do not give the size of the top T/Roller bearing i.e., 25x52x16.5 or the correct 25x52x15! Here is the link:

http://www.triumph-online.co.uk/triu...gs-14323-p.asp

Any reliable feedback on sizes and availability would be much appreciated!

>Deano

Last edited by DeanRider; 05-23-2011 at 03:13 PM.
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post #8 of 47 (permalink) Old 05-23-2011, 01:42 PM Thread Starter
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All good info, and is much appreciated.

teologie....Im curious as to why exactly the 16.5 bearing will not work specifically? From the factory the outer race of the top bearing was not seated fully into the lip of the frame and was protruding up from the neck slightly. Does the "width" measurement refer to the actual height of the assembled bearing?
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post #9 of 47 (permalink) Old 05-23-2011, 02:03 PM
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@ B R I A N:

25x52x15 Narrow Section T/Roller Bearing

ID = 25mm [Inside Diameter]
OD = 52mm [Outside Diameter]
Width = 15mm [Depth of Bearing]

On the '02 Daytona 955i the OEM Top Steering Head Bearing is a standard sealed deep groove ball bearing 6205DU 25x52x15 and fits flush into the steering head recess. On my motorcycle, this allows the OEM top bearing cover/cup/seal to seat completely. If one were to fit the T/Roller 25x52x16.5 the bearing would protrude by 1.5mm, thereby not allowing the top cover/cup/seal to seat fully and thereby letting water and/or dust to enter freely.

Hope this helps!

>Deano

PS. When assembling the bearings, I strongly recommend Bell-Ray Waterproof Grease. IMHO it is the Motorcycle mechanics best friend! http://www.belray.com/bel-ray-waterproof-grease

Last edited by DeanRider; 05-23-2011 at 02:05 PM.
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post #10 of 47 (permalink) Old 05-23-2011, 02:53 PM Thread Starter
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Quote:
Originally Posted by teologie View Post
@ B R I A N:

25x52x15 Narrow Section T/Roller Bearing

ID = 25mm [Inside Diameter]
OD = 52mm [Outside Diameter]
Width = 15mm [Depth of Bearing]

On the '02 Daytona 955i the OEM Top Steering Head Bearing is a standard sealed deep groove ball bearing 6205DU 25x52x15 and fits flush into the steering head recess. On my motorcycle, this allows the OEM top bearing cover/cup/seal to seat completely. If one were to fit the T/Roller 25x52x16.5 the bearing would protrude by 1.5mm, thereby not allowing the top cover/cup/seal to seat fully and thereby letting water and/or dust to enter freely.

Hope this helps!

>Deano

PS. When assembling the bearings, I strongly recommend Bell-Ray Waterproof Grease. IMHO it is the Motorcycle mechanics best friend! http://www.belray.com/bel-ray-waterproof-grease


Hmm.. I wonder if the upper race in my Speed was supposed to be pressed all the way in? there is a lip in the neck of the frame and the race was not up against it. As a result the bearing protruded from the frame slightly. Did someone at the factory not press the bearing all the way in or was that done on purpose for some reason?
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