Ultimate Hub for Direct Sprocket Bolt Up

A

andyinchville1

Guest
HI All,

In reading all the posts that expressed a concern over the current 9 hole mounting system for the sprocket (mainly addressing the issue of spoke breakage and /or obtaining a precision alignment of the sprocket itself), I was wondering why nobody makes a high quality hub that a sprocket can directly bolt up to....

I do realize that Grubee (I think) sells a hub that this can be done BUT it is really not suitable for a multi speed rear casette / freewheel and it probably isn't of real high quality anyways (like a true high end bike part...Say for instance Shimano Dura Ace...etc...).

I was wondering if it would be worthwhile to take a hub designed for a disc brake and mount our sprocket onto it in place of the disc...This would not only provide a good spoke free mounting area for our sprockets BUT also give us a high quality, readily available, hub with multi speed capability and perfect sprocket centering / alignment (not necessarily chain line alignment but the sprocket would have no wobble or be out of true.. .chain line alignment can be handled by a sprocket offset (sprockets would not be a problem since they can be custom made / drilled for this type application).....

Any thoughts or ideas on this?....Is the mounting area of a disc brake set up strong enough? ( I think the bolt holes are smaller and fewer but maybe high strength grade 8 could be used?)...Any experimenters out there? ;-)

Andrew
 


A

andyinchville1

Guest
Wow, Now that's A bike!...Thanks for the link Papa....And to think I would have been happy to do away with the disc to swap in a sprocket....Didn't even enter my mind that you could have both!
Andrew
 
A

alesterfeind

Guest
I bought this axle with the hub for a disc brake to try this out for a direct bolt on:

http://www.jensonusa.com/store/product/HU703B07-Shimano+Deore+Disc+M525+Rear+Hub.aspx

Andy, could you custom a 36T sprocket for this, and if so, what would you need from me? I could mail you a stencil drawing of the hole pattern so you could go by that. I was told that this type of hub is used by others, but I assume they are drilling out their own sprockets since I don't see any for sale that would fit due to the hole pattern.

Let me know what you think.
 
5

5-7HEAVEN

Guest
:cool:I have a STATON hub on my rack mount. quite pricey, but gets the job done. 7-speed cassette plus 16t freewheel sprocket on left side.

i spoke with Dave Staton, regarding a 36 freewheel sprocket for left-side. he knows of none available, but said that his 16t could be drilled to bolt the 36t on to.

i also ordered a HD hub from bicycle-engines.com. they referred me to their sub, who will drill a 36t sprocket to mount onto a freewheel hub.

Myron
 
A

andyinchville1

Guest
HI Johnny,

Yes, I could make a sprocket for that disc brake hub (actually, I've been dying to try that but my normal work has been quite crazy lately)....To make things as precise as possible I would need the actual hub so that I could get the precise measurements needed...unfortunately stencil drawings or "rubbings" are not precise enough when setting up the milling machines (of course I would send the hub back when I am done with it)...I wonder if all disc brake bolt patterns are the same?

Andrew
 
A

andyinchville1

Guest
Oops....further reading of the ad for the hub indicates that yes all discs have standard spacings if they meet the same 6 bolt IS standard...That is good news!...Finally the possibility of a real quality hub with a direct bolt on sprocket!

Andrew
 
K

Klox

Guest
The conversion Philcred did must be one of the best i have seen thus far. Only time will tell if it will withstand the forces applied..... Good on you Philcred!!!!

My personal choice would be a hub like this Shimano hub: http://www.universalcycles.com/shopping/product_details.php?id=19064&category=740
It is splined and therefore more suitable for an application where high torque could be an issue.
Or maybe one of these beefier ones like this one: http://www.universalcycles.com/shopping/product_details.php?id=9621&category=83

The machining of an adaptor for the Shimano hub would cost a bit of money, but it's only a once off expense...
 
A

alesterfeind

Guest
Klox, those do look nice, especially the chrome, but that price is what I would pay for an entire motor. I was hoping to stick under $50, and come up with a solution that others in here would feel is affordable. However, I have not tried the Shimano that I mentioned above, so it will be a test hub. It may be that a pricier, larger model will be better. We will see.
 
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