Custom rear bearing spacer.

[TiAvenger]

I believe the hub itself has a lip that will be an issue, I wont really know until the brake arrives.

I guess I will have to wait till then. 

I think I will order enough for 2 and have a machine shop make one, and make one myself for practice.

[TiAvenger]

The other issue (I've been thinking about) is future removal.  I would have to hit the spacer on one side to pop the bearing our on the other side. I dont know if it will be resilient  enough to stand more than one change out.  That or i would have to check the specs each time with a micrometer

[SP3]

IMO, don't machine the hubs.

Make a stepped spacer, kinda like this:

                       _______________________
       _________|                                       |_____________
      |______________________________________________|


      _______________________________________________
      |_________                                        ______________|                                                                               
                       |______________________|

Same ID as the 17mm spacer.
Major OD same as the OD of the 25mm spacer.
Length of the major OD portion same as the length of the 25mm spacer.
OD and length of the smaller ends to fit the ID and width of the 25mm bearings.

There's also the caliper bracket to consider, as well as the sprocket carrier....

This is a fairly involved deal, nearly impossible to get everything right via the internet....
Wanna give me a call?

So basically run 25mm bearings with the spacer carrying the axle through them?

The only component I don't have right now is the brake (caliper assembly/bracket)

Stu thinks the hub will have to be machined anyway to accept that. No way of knowing till I get it from Joels.

I was just pre planning so when the rest of the bike arrives, I can hit the ground running.

Red= axle  Blue = spacer Black = bearings Green= hub  note, not to scale.

That is what I did about 7 or 8 years ago. Mine is of 7075 T651. 6061 would suffice. Here is a pic of the finished item (from a thread on another forum).

http://www.ducati851and888.com/showpost.php?p=8555&postcount=8

[TiAvenger]

That is what I did about 7 or 8 years ago. Mine is of 7075 T651. 6061 would suffice. Here is a pic of the finished item (from a thread on another forum).

http://www.ducati851and888.com/showpost.php?p=8555&postcount=8

No access to the picture. 

How is bearing removal (if you have removed the bearings since.)

[Desmo Demon]

How is bearing removal (if you have removed the bearings since.)

You need a stepped drift that will fit into the ID of the spacer and then a larger OD that will catch the spacer but still fit through the bearing's inner race. You will drive the spacer out with the bearing that is on the opposite side that you are using the drift.

Ducati used a stepped inner spacer on the front wheel of the Paso 750 to drop the ID from 20mm down to 17mm. I had a buddy of mine make a drift to drive the original bearings out. Ducati used a stepped spacer on the Paso 750's swingarm, also.

I don't have a picture of the front wheel's spacer, but here is a picture of the little one used in the Paso's swingarm.



This is a drawing I made for the Ducati Paso forum to show how the spacer is on the front wheel of the 750...

[SP3]

No access to the picture. 

How is bearing removal (if you have removed the bearings since.)

No problem with removal. Press the spacer out of the wheel, the other bearing is still on the spacer, press the spacer out of second bearing.

[TiAvenger]

Thanks for the pictures. If you dont mind me asking, why did you not have it machined out of one piece?

With that, I think this one is pretty much *solved*

Though after using the search function it looks like the sprocket flange alignment may be a bigger issue. 

[SP3]

Thanks for the pictures. If you dont mind me asking, why did you not have it machined out of one piece?

With that, I think this one is pretty much *solved*

Though after using the search function it looks like the sprocket flange alignment may be a bigger issue. 

The spacer/sleeve pictured is one piece. Remember, it is for the front wheel.

[TiAvenger]

The spacer/sleeve pictured is one piece. Remember, it is for the front wheel.

My bad. The reflection looks like a weld on the inside.

[MrFryMoto]

hmmm shouldn't be too hard to make
i would need to pick up some tools for the lathe (boring bits, tool holders, etc.) and i need to check out the head-play

[TiAvenger]

hmmm shouldn't be too hard to make
i would need to pick up some tools for the lathe (boring bits, tool holders, etc.) and i need to check out the head-play

What model do you have?  I think I still have my quick change tool holder on my ruined 300d

[MrFryMoto]

What model do you have?  I think I still have my quick change tool holder on my ruined 300d

Craftsman 109.0702