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Easy Wheel Question (Lets make it a tutorial...)

Started by junior varsity, October 28, 2009, 04:49:04 PM

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junior varsity

October 28, 2009, 04:49:04 PM Last Edit: October 28, 2009, 06:17:39 PM by ato memphis
I have the solid front axle on my M900 - 20mm I believe. I just want to know how to put 25mm axle wheels on the front. (Without changing my front forks, haha - you are too funny, guy who was going to say that.)

Is this as simple as changing the bearings so that the ID is 20mm? (And if I had a 17mm axle, do the same for a 17mm ID)

Help a brother out, I've tried searching and found nothing conclusive.

Ducatl

#1
October 28, 2009, 05:01:35 PM
There's another issue actually, between the bearings there's another sleeve that rests inside the wheel between each bearing.  Assuming the outside bearing to bearing distance is the same between the wheels...you'd need new bearings and somebody to machine this inner sleeve.  I have no idea where you might find bearings to fit, or whether it's recommended to do it that way.

Alternatively...if you're making spacers anyways, you might consider getting custom longer spacers with a section that would fill the 5mm gap between the stock bearing and axle surface made.  

Any particular reason you're against changing the forks?

ducpainter

#2
October 28, 2009, 05:10:38 PM
You found nothing conclusive because it isn't simple. ;D

The bearing diameters are easy enough to come by, but the widths don't match up.

So you'll almost always have to change a spacer/speedodrive, or machine an axle shoulder when doing this.



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junior varsity

#3
October 28, 2009, 06:17:19 PM
Planning on ditching the speedo drive when upgrading and moving to a motogadget unit so a spacer of some type would be needed.

I guess I'll have to open up a wheel and look at the bearing and sleeve orientation to understand what I'd need to have machined. Seems like getting a machine shop to make a sleeve would be pretty cheap, unless i got a little nuts and wanted some fancy metal.

Ducatl

#4
October 28, 2009, 07:05:09 PM
Quote from: ato memphis on October 28, 2009, 06:17:19 PM
Planning on ditching the speedo drive when upgrading and moving to a motogadget unit so a spacer of some type would be needed.

I guess I'll have to open up a wheel and look at the bearing and sleeve orientation to understand what I'd need to have machined. Seems like getting a machine shop to make a sleeve would be pretty cheap, unless i got a little nuts and wanted some fancy metal.

Hah, good luck with that ;)

junior varsity

#5
October 28, 2009, 07:37:33 PM
A sleeve? Unless I'm mistaken, its simply a metal cylinder of a specific length, OD and ID...?

Ducatl

#6
October 28, 2009, 08:12:03 PM Last Edit: October 28, 2009, 08:13:37 PM by Ducatl
I suppose it depends on your definition of cheap.  In my experience machine time never seems to be cheap. Assuming you can do all the design work yourself that saves you a bit, so you're left with materials and shop time.

Also, as I understood it, we're talking about a sleeve and two fairly complex spacers with steps in them?
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