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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-14-2012, 07:41 PM   #1 (permalink)
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Mag Wheel bearings and CBR600F3

After much research, I am a bit confused.

Many of the people on here that are installing CBR600F3 rear wheels mention machining the wheel to accept the Triumph wheel bearing. Is this only necessary on a spoke wheel bonneville? My Mag wheel bonneville has a 17X47X14 bearing and the stock F3 wheel is 20X47X14. I should be able to press out the old F3 one and press in the new triumph one, right?
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Old 11-14-2012, 08:00 PM   #2 (permalink)
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The mag wheel rear is the same as a spoke wheel, so you'd need to replace the Honda bearings with Triumph, make or modify Thriumph spacers in the wheel and sprocket carrier, and use a Honda rear sprocket. Again, there is no difference between the spoke and mag rear wheels.
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Old 11-14-2012, 09:20 PM   #3 (permalink)
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I seem to have read somewhere that you could use the Triumph cush drive and sprocket carrier, is this incorrect?
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Old 11-15-2012, 03:25 AM   #4 (permalink)
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When you press out your Honda bearings to replace them with Triumph parts, you'll
need to replace the distance tube inside the hub. If the Triumph part is a different
length than the Honda one, you'll need to have one made so that the ID and OD are the
same as the Triumph part, and the length the same as the Honda.

The cush drives are different. You'll need to use the Honda cush drive.

You'll also have to make sure that your chain lines up properly. You probably will
need to have new axle spacers made to get this right.

If you have access to back issues of Cafe Racer Magazine, there were articles on this
mod in the October/November 2010 and December 2010 issues.
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Old 11-15-2012, 03:40 PM   #5 (permalink)
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Quote:
Originally Posted by cashmore1985 View Post
After much research, I am a bit confused.

Many of the people on here that are installing CBR600F3 rear wheels mention machining the wheel to accept the Triumph wheel bearing....
As others note, the triumph wheel bearings are direct fit in the honda wheel. You use the honda cush drive. The machining you refer to is to make the honda cush drive accept the triumph cush drive bearing.

To avoid chucking the honda cush drive in a lathe and opening up the bearing journal, you can also make up a new cush drive spacer that is identical on the exterior to the honda spacer, but with a 17mm axle hole (instead of the 20 mm honda shaft hole). With this method, you use the honda cush drive bearing...

HTHs,

--Rich
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Old 11-15-2012, 04:39 PM   #6 (permalink)
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Quote:
Originally Posted by beemerrich View Post
As others note, the triumph wheel bearings are direct fit in the honda wheel. You use the honda cush drive. The machining you refer to is to make the honda cush drive accept the triumph cush drive bearing.

To avoid chucking the honda cush drive in a lathe and opening up the bearing journal, you can also make up a new cush drive spacer that is identical on the exterior to the honda spacer, but with a 17mm axle hole (instead of the 20 mm honda shaft hole). With this method, you use the honda cush drive bearing...

HTHs,

--Rich
I think I understand. I am going to have to look at everything and how it fits together to see what you are talking about.
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Old 11-18-2012, 03:18 AM   #7 (permalink)
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Ok so I see how all of that fits together now. My next two questions are:
What about all the other little spacers on the triumph axle, do you use those? Does the chain line up and is the wheel centered?
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Old 11-18-2012, 01:19 PM   #8 (permalink)
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Yes, you use the triumph spacers that are exterior to the wheel assembly in the stock locations. I did notice that the sprocket alignment is a little off...the sprocket needs to move to the right a bit.

At least that is what I saw with my 51 year old laser-calibrated eyeball when refitting the rear wheel & adjusting the chain. I may shim the sprocket a bit since the studs on the honda cush drive allow for about 1/8" of movement away from the centerline without losing an exposed thread on the outside of the nut.

As far as whether the wheel is precisely in line with the front wheel or not, I have no idea! The rear wheel sits about 1/2" to the left of center in the swingarm, but I'm uncertain of how that relates to the front wheel...which got fitted yesterday...



Cheers,

--Rich
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Old 11-18-2012, 03:21 PM   #9 (permalink)
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Looks good. I'm really curious about whether or not the original wheel is centered or not. This is all raising so many questions I'm not sure I am going to go through with it.
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Old 11-18-2012, 06:20 PM   #10 (permalink)
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I am going through this swap right now as well, I have a thread on the cafe forum. I am kind of a perfectionist when it comes to the thruxton so I will be wanting everything to be perfectly lined up when I am done. I should have some answers here in the next month or so. Trying to take alot of pictures as I go to explain the process.
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