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Old 01-21-14, 05:55 PM   #1
Shahmatt
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Can I remove the axle on this hub? Can I extend the axle?

Hi all,

I've posted some photos of the problem below. Any help is greatly appreciated.



I need to extend the axle on the hub of this wheel so that it can sit on 135mm stays. The wheel originally sat on 75mm non-standard stays.

I have a longer axle and thought that replacing the existing axle should be straightforward (I have only seen youtube videos of how this might be done) I opened up the hub to the extent you see in the images, but can't proceed from there. My LBS has now told me that the hub is sealed and the axle cannot be removed. But I'd still like confirmation of this.

If the hub cannot be disassembled I wonder if there is anything I can use to extend the axle. Like an axle extender used for kids' training wheels: http://www.especialneeds.com/axle-extender.html

Or are there any stay attachments out there I can use to reach the axle on the wheel?

Or is the only way forward to remove the hub completely and rebuild with a new hub?
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Old 01-21-14, 06:24 PM   #2
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The axle is probably pressed in, and can be pressed out and replaced. However, there's always the possibility of inside shoulders and other obstacles to pressing, so contact the maker for instructions, or at least a cross section drawing you can use as a guide.

OTOH, if the longer axle you have is an original part, then it might give you the info you need to proceed.
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Old 01-21-14, 07:47 PM   #3
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If you do continue to try to extract the axle take care that you don't impact it with a steel headed hammer. This could cause the bearings to become indented.

Also the shop that said the axle can't be removed does not know what they say. Or they really don't want to take on the job. I always prefer that a shop be honest in their skills then be dismissive with their claims.

Your project is interesting. Would you give us more information WRT the bike or ? the wheel is being fitted to? Andy.
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Old 01-21-14, 09:34 PM   #4
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Quote:
Originally Posted by FBinNY View Post
The axle is probably pressed in, and can be pressed out and replaced. However, there's always the possibility of inside shoulders and other obstacles to pressing, so contact the maker for instructions, or at least a cross section drawing you can use as a guide.

OTOH, if the longer axle you have is an original part, then it might give you the info you need to proceed.
I will take your advice and see if I can find a manufacturer who can help me. I believe the hub has a brand name on it. I will check when I get back home (I am at work now).

Quote:
Originally Posted by Andrew R Stewart View Post
If you do continue to try to extract the axle take care that you don't impact it with a steel headed hammer. This could cause the bearings to become indented.

Also the shop that said the axle can't be removed does not know what they say. Or they really don't want to take on the job. I always prefer that a shop be honest in their skills then be dismissive with their claims.

Your project is interesting. Would you give us more information WRT the bike or ? the wheel is being fitted to? Andy.
Noted the precaution. Would a rubber hammer be the way to go then?

I do not think the shop men are dishonest. It could be that they are unfamiliar with the type of hub. These types of hubs are less often found in my neighborhood.

I am building a Front Wheel Drive recumbent bike using the Cruzbike conversion kit.

The conversion requires the wheels of the donor bike to be interchanged - i.e. the rear drive wheel attaches to the front fork via a 135mm to 100mm bracket, and the front wheel goes on the rear spacers by extending the axle length.

My donor bike is a Flamingo NX7 folding bike. I chose it as the folding configuration seemed such that it may still be folded post conversion. I need a folding bike for the type of city commuting I do.

The front wheel spacers are a non-standard 75mm, which complicates the attachment of the drive wheel dropout, but I have managed to work around this problem. I was ready for it when buying the kit.

Fitting the front wheel to the rear spacers though. Didn't see this problem coming.

Unfortunately the bike uses the relatively rare 16 inch 349 wheels, so a replacement wheel with a suitable hub is not an off-the-shelf item.
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Old 01-21-14, 09:57 PM   #5
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I wasn't saying that the shop was in itself dishonest. But that they really didn't tell you what was likely really going on. By saying that the hub wasn't serviceable they didn't have to say they didn't want to deal with the job. If they had just said this from the start I would have called them honest. Instead they dismissed the possibility of needing to do this job with their claim that it couldn't be done. Not exactly dishonest but not exactly true either.

The project sounds pretty cool. I have been the recumbent wrench in many of th shops I've worked in over the years. Maybe because i had an Avatar 2000 back in the early 1980s or I didn't feel that they were to be made fun of. I'm of the opinion that whatever it takes for more to ride is good with me. Andy.
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Old 01-21-14, 10:32 PM   #6
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Quote:
Originally Posted by Shahmatt View Post
Unfortunately the bike uses the relatively rare 16 inch 349 wheels, so a replacement wheel with a suitable hub is not an off-the-shelf item.
Looks like you might have to consider lacing a different hub into the rim. The flanges will likely be further apart which would require longer spokes, but you might be lucky; maybe you can re-lace it 1x instead of 2x with the original spokes.
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Old 01-22-14, 02:13 PM   #7
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need a source to machine a replacement axle , since its not a common threaded one ..

Singapore obviously has machine shops, manufacturing for Export,

whether there are small ones & they take on small jobs , is learned by asking ..
[there, not here]


I suspect there May be a shoulder between the bearings ,

pressing out the axle will involve also pressing out one of the bearings .

another job a machine shop is well equipped to do ..



349 is a common folding bike rim , used by Brompton,, and Bike Friday for their Tikit

Quote:
The wheel originally sat on 75mm non-standard stays
.

Dahon And other folding bike makers use a 74mm wide fork spread.

it is standard for them .. just 100mm is more common on non folding bikes
where the wheel rim is bigger.
Quote:
My donor bike is a Flamingo NX7 folding bike.
a Brompton clone as I hear.. the Brompton is a 117 rear fork , not 135 anyhow ..

SIMPLER...
I'd say sell the front wheel, as Is, and use the cash to hire a different wheel built.

if you start out with a wider hub , using a threaded axle
say a common freewheel rear hub .. or a track rear hub
then you can replace the 10x1 axle with a longer one..

just dont sweat that one end is threaded ..
have them build the wheel without any dish. since no gear will be fitted.

then you're good to Go ..

Last edited by fietsbob; 01-22-14 at 02:40 PM.
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Old 01-22-14, 08:39 PM   #8
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Quote:
Originally Posted by fietsbob View Post
need a source to machine a replacement axle , since its not a common threaded one ..

Singapore obviously has machine shops, manufacturing for Export,

whether there are small ones & they take on small jobs , is learned by asking ..
[there, not here]


I suspect there May be a shoulder between the bearings ,

pressing out the axle will involve also pressing out one of the bearings .

another job a machine shop is well equipped to do ..



349 is a common folding bike rim , used by Brompton,, and Bike Friday for their Tikit

.

Dahon And other folding bike makers use a 74mm wide fork spread.

it is standard for them .. just 100mm is more common on non folding bikes
where the wheel rim is bigger.

a Brompton clone as I hear.. the Brompton is a 117 rear fork , not 135 anyhow ..

SIMPLER...
I'd say sell the front wheel, as Is, and use the cash to hire a different wheel built.

if you start out with a wider hub , using a threaded axle
say a common freewheel rear hub .. or a track rear hub
then you can replace the 10x1 axle with a longer one..

just dont sweat that one end is threaded ..
have them build the wheel without any dish. since no gear will be fitted.

then you're good to Go ..
Thanks very much. I have since found out that the axle brand is called "Chosen".

It appears to be a Taiwanese or Chinese company. I shall try emailing them requesting advice.

In the mean time, I will also source for 349 wheels or rims and try to get a suitable axle on.
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Old 01-24-14, 07:11 AM   #9
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Just a thought.

The existing hub is a quick release hub. I don't have a quick release skewer but one can possibly be bought at the LBS.

My question is if a rear quick release is used can the quick release skewer act as an axle, suitably reinforced with spacers maybe.

Or would the skewer be too weak for the purpose. Sorry I have not seen any real life quick release skewers to judge. I'm assuming not feasible but just thought I'd check.
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Old 01-24-14, 10:26 AM   #10
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The narrow hub front Brompton uses in their most basic model is solid... but it too is too short .

a Quick release skewer is only 4.5 ~ 5mm thick . it functions in Tension ,
an axle has to survive shear Forces , bending .

at least in this dimension of the Universe.

reads like you are not mechanically inclined , do you have someone to Hire , to do the work for you?

the outcome will I expect be better.. and you can devote your time to your talents..

Last edited by fietsbob; 01-24-14 at 10:31 AM.
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Old 01-24-14, 11:11 PM   #11
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Noted about the quick release skewer.

I have purchased a second hand hub of slightly longer flange width as the original hub.

The hub also has the same number of holes as the rim. I changed the axle to the longer 135mm one, but bearings may need replacement, or at the very least regreasing.

Now to find a wheel builder to do up the wheel for me. Hopefully he won't need new spokes. But given the longer flange width unlikely.
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