The Ultimate Hub for Direct Sprocket Bolt Up

HI All,

In reading 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, dishing the wheel etc...Sprockets would also be able to be changed out with great speed since alignment and centering issues
would become a moot point.

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

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PS - Since this post was originally made, Our Custom Sprockets are now available drilled in a dual pattern ( one set of holes to accommodate the original HD 9 hole mount and another set to accommodate the 6 Bolt IS standard for mounting the sprocket in place of the rotor on a disc brake type hub. The bolts needed for mounting a sprocket in place of a disc are said to be M8 x 15.....Any testers out there?.....The original customer that was going to try the prototype ended up having bike issues and was not able to accomplish the test.

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Just thinking about the application on my bike (stretch). I need that extra clearence that the existing mount provides. As it is now my chain travels very close to my wheel (tire). I've seen hubs that are made for direct mount. I will try to find the link and post it. The link here actually goes around the hub (clam-shell) and then the sprocket attaches to it....independent of the spokes.Sprocket Adapter Mount Motorized Bicycle Moped Bike Kit - eBay (item 310013580865 end time Jan-15-08 16:00:41 PST)

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HI Red,

I have seen that advertised before.....I wonder how much further outboard that would put the sprocket?....I would imagine that the disc rotor location would help you too since it is on the very outside of the hub itself (I have to admit I am a little concerned that it may be too far out and require minor redishing of the wheel itself or simply adjusting the cones a bit to keep a good chain line?)....Please keep us informed whichever route you choose....

Andrew

I've mounted one to a hub but haven't lace the wheel up to try it out yet. I think it would work perfectly and I don't know why no one has done it yet.

Dan

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Get that mount or something similar for the sprocket and then mount a disc brake on the sprocket and kill two birds with one stone. Something for me to think about and let someone else end up doing it. Like Exile Cycle does.
Norman.

Andy I'am on it baby this is the tickit! I got one of your aluminum jewels at hand. There is an octagon shape to a disk brake rear wheal set up for mad max playing is concerned, why not have a fitt! make the inside diameter of the sprocket tightly fit the octagon shape? then mount it traditionaly as all these sprockets have been donefor these chinas . Youl be able to enjoy the disk brake, and the sprocket as well. Kill to birds with one stone. The sprocket bear hugging the octagon shape and the spokes would be a unibody structure cheating vibe probs, and running the hub. has anybody done this I'am without a chance for now, but fully intend to try!? hope this gets more Ideas?

something else if you have a bike not set up to mount disc calipers. I would think that jigging this up by delicitly setting up the caliper by engaging it to hole it true and square, then spot welding the mounts. what ever works havent done this yet but will sometime

I tried, but my 44t hit the rear lower chainstays...ended up grinding the rotor mounting lugs completely off and spoke mounting. Then tire rubbing on chain, dropped from a 2.1 to a 1.5 wide tire, now all good.

Giant bicycles makes a dics brake wheel for about $50.00 bucks.It will requiror making
your own offset sprocket.As soon as i can post pics (having problems) i will explaine
how i did it.

Just would like to give this a bump. I am a newcomer to the forums and am planning to install one of Dax's 70cc kits on my Rock Hopper mountain bike.

The Rock Hopper has disc brakes, and I was curious if any has gotten this to work.

It looks like I will have to ditch the rear disc brake if I go with the traditional spoke hub install (the brake itself doesnt look like it would clear the new sprocket)

For some reason (correct me if I'm wrong) I get the impression that you would be able to mount the sprocket to the actual rear disc, rendering it useless but providing a solid mount for the new sprocket. Does that make any sense?

I have another set of non-disc brakes that I was going to slap on in the rear but keep the front disc.

Thanks is advance