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Triumph Bonneville Neck Bearings

2683 Views 6 Replies 4 Participants Last post by  enikolich, 
E
Hi all. I have a 1969 Bonneville with a springer front end. The springer has a 7/8" stem on it. My front end has been really sloppy lately and I would like to convert the bearings to the Timken style tapered roller bearings. No one seems to carry such a conversion kit. I've checked with Klemphs, LowBrow and Four Aces. There is a conversion kit for the original size, but not 7/8". I've looked on the Timken website and can't seem to find a cup/cone combination that will work.

My last resort is a custom bearing supplier but thought someone here may have dealt with this before. Thanks!
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TheAppleKnocker
You will probably need to run 2 of the top bearings bearings because a stock triumph stem is a bit than 7/8 larger on the bottom
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VonWegener
Get a Timken conversion kit for the stock '69 front end from LowBrow and have 2 spacers machined. Easy as pie.
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E
Yeah. I think that's the way to go. Just machine a couple of sleeves for the stem and use the 1" bearings. I'll post my results when I finish. Thanks!
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enikolich said:
Yeah. I think that's the way to go. Just machine a couple of sleeves for the stem and use the 1" bearings. I'll post my results when I finish. Thanks!
Click to expand...
can we see pics of this job
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E
I will try and post some picks this weekend. I got the bearing conversion kit from Low Brows. Just need to have two spacers made to adapt the bearings to the 7/8" stem. Should not be too big a deal.
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Here is what I discovered. The original triumph neck bearing cups and balls were used. A piece of brass and some shim stock were used to compensate for the difference. Hard to see in the pictures though. But this explains my squirley front end feeling.

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