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Can a 17mm axel front wheel be adapted to a 25mm axel?

Started by A.duc.H.duc., May 06, 2009, 09:23:03 AM

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ducpainter

#15
May 11, 2009, 03:31:40 AM
Quote from: A.duc.H.duc. on May 10, 2009, 09:57:42 PM

Or did you mean bushings to space the axel out to the forks?
Yup
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


A.duc.H.duc.

#16
May 11, 2009, 05:13:39 AM
Quote from: ducpainter on May 11, 2009, 03:31:40 AM
Yup

Well that's an interesting idea. Not sure if I'd trust the pinch bolts to hold the axel with a bushing that big, but maybe.
"Listen, not a year goes by, not a year, that I don't hear about some escalator accident involving some bastard kid which could have easily been avoided had some parent - I don't care which one - but some parent conditioned him to fear and respect that escalator."

ducpainter

#17
May 11, 2009, 05:17:40 AM
Quote from: A.duc.H.duc. on May 11, 2009, 05:13:39 AM
Well that's an interesting idea. Not sure if I'd trust the pinch bolts to hold the axel with a bushing that big, but maybe.
The bushing isn't going to end up that big.

Slot the bushings. The pinch bolts will work fine.

"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


A.duc.H.duc.

#18
May 11, 2009, 03:11:31 PM
Quote from: ducpainter on May 11, 2009, 05:17:40 AM
The bushing isn't going to end up that big.

Slot the bushings. The pinch bolts will work fine.



Well I assumed the slotting was implied. You're right, it wouldn't be that big. It seems like a practical, though not elegant, solution.
"Listen, not a year goes by, not a year, that I don't hear about some escalator accident involving some bastard kid which could have easily been avoided had some parent - I don't care which one - but some parent conditioned him to fear and respect that escalator."

ducpainter

#19
May 11, 2009, 04:02:09 PM
Quote from: A.duc.H.duc. on May 11, 2009, 03:11:31 PM
Well I assumed the slotting was implied. You're right, it wouldn't be that big. It seems like a practical, though not elegant, solution.
Elegance is a luxury I can't afford.

I'm more of a pragmatist.

Make it work bro. ;)
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


A.duc.H.duc.

#20
May 11, 2009, 05:04:34 PM
Quote from: ducpainter on May 11, 2009, 04:02:09 PM
Elegance is a luxury I can't afford.

I'm more of a pragmatist.

Make it work bro. ;)

That's pretty interesting considering your profession. ;)
"Listen, not a year goes by, not a year, that I don't hear about some escalator accident involving some bastard kid which could have easily been avoided had some parent - I don't care which one - but some parent conditioned him to fear and respect that escalator."

ducpainter

#21
May 11, 2009, 06:06:47 PM
Quote from: A.duc.H.duc. on May 11, 2009, 05:04:34 PM
That's pretty interesting considering your profession. ;)


This isn't my customers stuff we're talking about. ;)

My Monster tank is all bashed in and my 996 looks like it graduated clown college..

You don't have the cake to buy wheels.

My idea works. ;D
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


dlearl476

#22
May 12, 2009, 07:13:56 AM
Quote from: A.duc.H.duc. on May 10, 2009, 09:57:42 PM
My current front axel is 17mm, as is my wheel, and its bearings. I want to swap forks to a set with a 25mm front axel. I could get new rims, but to be honest, I just haven't found a set I like.

Or did you mean bushings to space the axel out to the forks?

Try these guys:
http://www.accuratebearing.com/quote.php

I've been working too many 18 hours days lately to wrap my head around your issue.  Like most, I'm going the other way.  The critical issue will be finding a bearing with the proper width, so that the tension on the axle when torqued doesn't jam up the bearings.  When you get your front end apart, drop me a pm, I may have the bearings you need that I purchased by mistake when I was working on getting my 25mm wire wheels on my 20mm axle.  I ended up going with some SBK forks now that I've found some cheap 65mm calipers and a spare top triple to machine to 53mm.  (Thanks Gil, and Mandy)

dlearl476

#23
May 12, 2009, 07:15:53 AM
Also, did you sort your top triple situation?  I'm selling the cycle cat 53 mm top clamp I bought for this swap because I don't want to use clip-ons.

A.duc.H.duc.

#24
May 12, 2009, 07:35:05 AM
Quote from: dlearl476 on May 12, 2009, 07:15:53 AM
Also, did you sort your top triple situation?  I'm selling the cycle cat 53 mm top clamp I bought for this swap because I don't want to use clip-ons.

I've got a Cycle Cat 53mm top clamp...
"Listen, not a year goes by, not a year, that I don't hear about some escalator accident involving some bastard kid which could have easily been avoided had some parent - I don't care which one - but some parent conditioned him to fear and respect that escalator."

Speeddog

#25
May 12, 2009, 09:06:21 AM
I'm with DP on this one.

One bushing, internally threaded to match the axle, 25mm OD.
So it would be the same general arrangement as what you've got now, just bigger OD.
Or a split bushing, and re-use the OEM threaded bushing.

A split bushing for the other end.

Mock-assemble it before you get parts made, to make sure you've got the wheel centered in the forks.
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dlearl476

#26
May 13, 2009, 04:49:28 PM Last Edit: May 13, 2009, 04:53:44 PM by dlearl476
Quote from: Speeddog on May 12, 2009, 09:06:21 AM
I'm with DP on this one.

One bushing, internally threaded to match the axle, 25mm OD.
So it would be the same general arrangement as what you've got now, just bigger OD.
Or a split bushing, and re-use the OEM threaded bushing.

A split bushing for the other end.

Mock-assemble it before you get parts made, to make sure you've got the wheel centered in the forks.

One thing that throws a wrench into the works, so to speak, is that the diameter of the axle isn't the only variable.  The hubs of  20mm and 25 mm wheels are different widths, and that difference is dealt with by different speedo drives and a different step on the axle itself. 
Like I posted earlier, I'm friggin' exhausted, but I can't help but think some of the issues I dealt with attempting my 20mm>25mm swap would pertain to a 25mm>20mm swap as well.  The trick is to have just the right width so when the axle is torqued you get just the right loading on the bearing.  Too much and the wheel won't turn, to little and it will wobble. Another variable is that a 20mm axle is torqued to 90 Nm and a 25mm one something like 15Nm.  (I can't remember the exact numbers, the the difference is significant)

A.duc.H.duc.

#27
May 13, 2009, 07:01:17 PM Last Edit: May 13, 2009, 07:03:57 PM by A.duc.H.duc.
anyone have a silver 25mm axel front wheel then? With the appropriate speedo drive?

I'd just buy that if it solved my problems.

...with rotors would be nice.
"Listen, not a year goes by, not a year, that I don't hear about some escalator accident involving some bastard kid which could have easily been avoided had some parent - I don't care which one - but some parent conditioned him to fear and respect that escalator."
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