Cassette Adapter for 5/8 or 3/4 axle?

[ggriffin924]

Has anyone tried using a cassette instead of the freewheel adapter?

http://www.icyclesusa.com/catalog/ritchey-shimano-compatible-freehub-body.htm

I found this one it has a 14mm bolt integrated, I am wondering if it could be drilled out to 5/8 so the axle would mount, or maybe have the end of the axle drilled and tapped for the 14mm bolt to thread into.

[Odd Man Out]

Howdy
I have built a number of "Wolves" with a cassette adapter. I had a machinist cut some threads into each end of a piece of round stainless steel and put a thread on the end of the drive side axle. The axle threads into one side and the cassette holder (for lack of the real name) threads into the other. Simple and elegant. Pictures follow:
http://farm4.static.flickr.com/3263/2868275235_2505a42397_m.jpghttp://farm4.static.flickr.com/3107/2869106424_30ceb619d1.jpg

Hope This Helps

[macka]

Heck odd you could even do that is cold rolled and just weld it on to the axle. Nice idea, glad you posted it.

[AtomicZombie]

If you could source the proper nut, that could also be welded to the axle.

Brad

[TheKid]

OK OMO, we need details. What size and pitch are the threads on the freehub? What is the length and diameter of the SS rod? Why SS? Was it recommended by the machinist? Will carbon steel work as well? This is a great idea for those who want 8-10 speeds in the rear.

[TheKid]

Good link Grif. I found this disc on that site: Scroll down, there's a disc for 10 bucks.

http://store.nexternal.com/shared/StoreFront/default.asp?CS=icycles&StoreType=BtoC&Count1=653148829&Count2=570289254&CategoryID=14&Target=products.asp

[Odd Man Out]

OK OMO, we need details.
1. What size and pitch are the threads on the freehub?
2. What is the length and diameter of the SS rod?
3. Why SS?
4. Was it recommended by the machinist?
5. Will carbon steel work as well?
This is a great idea for those who want 8-10 speeds in the rear.

Otay here goes...
1. Dunno -- they fit the piece. Take your "the piece" to a local machinist and he will tell you quickly.
2. Around 1.5 by 2.25.
3. For strength and "weatherability"
4. Yes
5. Yes
I don't know about you but I wanted to put a 9 speed cassette on the driving axle of the DeltaWolf... what you seem to want to do seems a bit perverse !!
:):):)

[TheKid]

I was thinking about a variable laxative I guess. :eek:

Thanks for the info. The adapter you had the machinist make gives me an idea for a freewheel adapter. Thread the axle, with 3/4-16 threads. Screw a nut on the axle, slide a left side BB cup against the nut, then weld the nut to the BB cup.

[jimFPU]

OMO, can you provide more pics of the assembly as it gets built up to the installed version? I think I know where it all goes, but this is the first time building for me.

Also, what exactly is a left BB? I know what left is, and I know what a BB is, but what exactly is the difference in BB's? Maybe I need to spend some more time on Sheldon's site...any pics Kid?

[TheKid]

Left Bottom Bracket cup. The cup holds the bearings and screws into the BB shell for 3 piece cranks. The pic is in the SF thread, where you asked for Sparky's freewheel and disc adapter.
There are different types of BB's. The most common in North America are the one piece type, found on most kids bikes, and the type used for 3 piece cranks, with American threads. The latter is a cylinder threaded right on one end, and left on the other. two cups hold the bearings and get screwed into each end. The left side has right hand threads, so you'd use the cup for the left side to make a freewheel adapter. Freewheel and BB's have the same threads.

[ggriffin924]

OMO, do you have a link for where you got your cassette adapter? I think it should be pretty easy to have the end of the drive axle threaded also, and a simple solution, very good. Thanks for posting.


I have built a number of "Wolves" with a cassette adapter.

[macka]

Have you looked at Harris cyclery? The website is http://sheldonbrown.com/harris/hub.html (http://sheldonbrown.com/harris/hub.html)
He might have a quick cheap fix for you, and he is a mix and match guru, he helped my brother out with a project bike.

[Odd Man Out]

OMO, do you have a link for where you got your cassette adapter? I think it should be pretty easy to have the end of the drive axle threaded also, and a simple solution, very good. Thanks for posting.

Sorry -- it is a custom item from my local machinist. It was a simple process that any machinist could do.

[Odd Man Out]

OMO, can you provide more pics of the assembly ?
Sure thing
The first is everything laid out. Closest is the threaded axle, next down is the part I had made. left side is threaded for the axle and right side is threaded for a standard bike part that holds the cassette. Next down is that "cassette holder" (sorry, my mind's a blank as to it's real name) and then of course next down is a 9 speed 11-34 cassette.

http://farm4.static.flickr.com/3285/2870768925_be67e53d6f.jpg

Next pict is it all screwed together. Very strong and I am able to take it apart if needed.

http://farm4.static.flickr.com/3050/2871600334_bbb80ef033.jpg

Also, don't know if you would be interested but I posted a description and a few picts of how I deal with making the flanges for the hubs. Here's the URL for that:
http://forum.atomiczombie.com/showthread.php?t=442 (http://forum.atomiczombie.com/showthread.php?t=442)

Hope this helps

[AtomicZombie]

Nice work! I was wondering if axle flex was a problem in your design? I did somthing like that on a sociable tandem tadpole trike but very hard cranking would flex the axle just enough to cause the chain to skip along the next closest ring. This happened because the return chain is fed by the stationary frame mounted rear deraillieur, which would misalign about 1/16 of an inch as the axle flexed. This was a 3/4 axle.

Brad

[Odd Man Out]

I was wondering if axle flex was a problem in your design?
Brad

No problem with flexing, I have the adapter flush against the bearing so the flexing forces that the piece itself can't handle ( and it is a fairly thick chunk of stainless steel ) are taken up and supported by the pillow block and frame itself.
Hope this helps.

[TheKid]

The cassette holder is called a freehub. Excellent design. Simple and effective.

[AtomicZombie]

Thanks for the info. The skipping really only happened when I gave it my all starting off in mid to high gear (I know, bad idea).

At first, I though I was stretching another chain, or had worn teeth but after careful examination I found that even a 3/4 axle will flex slightly if sticking out more than 1 inch from the bearing race.

Brad

[Pagan Wizard]

Wish I could get 1 of these for a 3/4 inch axle, but I know the price would probably be pretty high.

[TheKid]

For a 3/4" axle, it looks like you'd be able to get the axle drilled and tapped on one end to accept the freehub without the adapter.

BTW, I'm mistaken. What I called a freehub is actually called a cassette body.

[locolarry]

TK-
What would be the tap and thread size?
Thanks, Loco

[Odd Man Out]

[quote=TheKid;11052]For a 3/4" axle, it looks like you'd be able to get the axle drilled and tapped on one end to accept the freehub without the adapter.quote]

Here are a few picts -- it does not look like there is enough "meat" to do what you suggest, ergo the method I went with.

LocoLarry: hopefully you can get the size and TPI from the picts.

http://farm4.static.flickr.com/3040/2873323460_c331880549_m.jpghttp://farm4.static.flickr.com/3048/2873323444_b16863efdc_m.jpghttp://farm4.static.flickr.com/3201/2873323418_11e17e6f22_m.jpg

[macka]

Standard 3/4 sizes are 3/4-10 and 3/4-16 by the thread count it looks to be 3/4 7 which would be close to the metric size M20x1 or M20x1.5, not to cause any confusion but I'd say M20x1.5

[TheKid]

Wow. They looked smaller in the other pic. It looks like 7/8", but it's probably metric. Maybe 22mm?

[macka]

Wow. They looked smaller in the other pic. It looks like 7/8", but it's probably metric. Maybe 22mm?

22mm is closer to 7/8" IIRC

[jimFPU]

OMO as it turns out I have one of those cassette adapters, but how do I disassemble it from the hub it's on? I can't seem to figure that one out, and Sheldon's site doesn't tell...
http://i353.photobucket.com/albums/r399/jnk6/DSC00108.jpg

[TheKid]

22mm is closer to 7/8" IIRC

That's what I thought. Notice the ruler in the pic is marked in 1/32's for the first inch.

Cassette bodies are usually removable with an allen key inserted into the hub. I don't know the size.

[Odd Man Out]

OMO as it turns out I have one of those cassette adapters, but how do I disassemble it from the hub it's on? I can't seem to figure that one out, and Sheldon's site doesn't tell...
http://i353.photobucket.com/albums/r399/jnk6/DSC00108.jpg

Use a 12mm allen key -- that's da ticket:):):)

[jimFPU]

OK, thanks. I'll give it a try.