Deore XT 2004 rear brake disc splines

Doug Goncz said:

Hello.

Are the splines that hold on the disc brake on the Deore XT 2004 rear hub's left side the exact
same as the cassette splines on the right, or perhaps the same as _some_ still available cassette?

I say because the ultracapacitor bike version 3 needs a freehub. I'd fit a 32 tooth cog and some
spacer bits to the disc brake side to drive the motor located in the frame triangle. My current
version, version 1, uses a flip-flop hub and a custom made chain ring holder.

Can you think of any way to add a chain ring to the left side of a free hub? Yes, I could buy a
single speed disc cog and bore it out, then cut the splines or drill the holes. Some off the shelf
way, hopefully, or a real simple, cheap way.

I'm not quite sure I understand your question but I can say that I use the same splined tool to
tighten the lockring on my XTR discs and to remove the cassette on the right side. Please note that
first you slap the disc onto the splines of the hub, then you screw a lockring on top to hold it in
place. This lockring is splined in the center so that you can insert the casette removal tool into
it for tightening torque.

--
Perre

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[email hidden] ( Doug Goncz ) wrote in message
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Quoted message said:

Hello.

Are the splines that hold on the disc brake on the Deore XT 2004 rear hub's left side the exact
same as the cassette splines on the right, or perhaps the same as _some_ still available cassette?

For this hub:
shimano-europe.comcontent prodx.phtmlOpen ↗

???

No. No bicycle cog fits that spline.

Quoted message said:

I say because the ultracapacitor bike version 3 needs a freehub. I'd fit a 32 tooth cog and some
spacer bits to the disc brake side to drive the motor located in the frame triangle. My current
version, version 1, uses a flip-flop hub and a custom made chain ring holder.

Can you think of any way to add a chain ring to the left side of a free hub? Yes, I could buy a
single speed disc cog and bore it out, then cut the splines or drill the holes. Some off the shelf
way, hopefully, or a real simple, cheap way.

Why not use a tandem freehub, which is threaded on the left side, and make a threaded adapter from
the hub to sprocket? This is how some of the Electrathon cars adapt larger sprockets (bicycle
chainring size) to bicycle wheels. Take a look at blueskydsn.comproducts.htmlOpen ↗ - the "M6
Sprocket Adaptors".

Jeff

Quoted message said:

From: [email hidden] (Jeff Wills)

Quoted message said:

Take a look at blueskydsn.comproducts.htmlOpen ↗ - the "M6 Sprocket Adaptors".

Cool! That's almost exactly what I already use.

I use a cheap flip-flop freewheel/track hub from Sheldon Brown (Sovos?). The right side is a 7 speed
Sachs freewheel 13-32. In a week it will be a Hyperglide 11-34.

The left side is a 110 mm steel BMX spider drilled to 1 5/16 and tapped to 1
3/8 - 24, with a bottom bracket lock ring brazed on. It has 48 T.

For Version 3, the base bike is a Browning Automatic Transmission Bicycle. This unique transmission
mounts to a freehub. So a freehub is required, and I thought I could put a 34 T cog on the left
side splines.

I think it more likely I'll get another spider, drill it to whatever, and mount it on the disc brake
position with the six cap screws. That'll get Version 3 up and running.

Do any of you know the bore of the disc brake? Is it 1 3/8 or less by 1/16 inch increments? I have
the Unibit for that, purchased for the threaded spider.

By the way, I never tried it, but with my 48/38/28 front and 48 rear flipped around, the chain was
tight on the 38-48 combination, I think it was, and I could have had the world's lowest geared track
bike. Maybe I did try it.....

What exactly is a tandem freehub? Why do they thread the left side? Is it the same as a
flip-flop hub?

Yours,

Doug Goncz (at aol dot com) Replikon Research, Seven Corners, VA

1100 original posts at: groups.google.comgroupsOpen ↗

[email hidden] ( Doug Goncz ) wrote in message
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Quoted message said:

What exactly is a tandem freehub? Why do they thread the left side? Is it the same as a
flip-flop hub?

Tandem hubs have had hub brakes for ages. The left-side threads are for a drum brake such as the
Arai. In olden days, they were simply threaded on both sides: right side for freewheel, left side
for brake. Now Shimano has gone all fancy-schmancy and put a cassette body on the right. :-)

A flip-flop hub is very similar, but it's generally set up with similar spacing on both sides so the
chainline comes out right. A tandem hub is never flipped over, so the spacing doesn't have to be
symmetrical.

Jeff