Losing your Ragjoint!

Nashville Kat

Well-Known Member
Apr 20, 2009
1,497
48
48
Jacksonville, Florida
On my couple of builds- completed several years ago- I mounted my motor sprocks directly to drilled flip/flop rear hubs (smooth sided large flange)

Now we can easily and more cheaply get disk brake hubs like these:
http://www.ebay.com/itm/Pair-Mounta...7d6db36&pid=100005&rk=2&rkt=6&sd=141707441658

And the ebay guy in Miami at least has alloy sprocks with inner disk brake drillings,
http://www.ebay.com/itm/MOTORIZED-B...430839?hash=item3f5bffce77:g:ZSMAAOSwpzdWtlhg
plus you can still get them- a little more money, but super nice- from Kings Sprockets
http://www.kingssalesandservice.com/

just noticed another item - f you want to go cheap:
http://www.ebay.com/itm/30200418287...49&var=600803066188&ssPageName=STRK:MEBIDX:IT
It's a disk brake adapter that threads on a rear threading-

luckily I already have one of these lying around:

http://www.ebay.com/itm/Bike-Bicycl...9a67688&pid=100005&rk=3&rkt=6&sd=222063529655

So for a 99 cent adapter I'll see if it threads up- I think you can reverse the adapter either way? Wondering if the mounting hole threads are right then?

Anyway- losing the rag joint and it's long and heavy bolts, and replacing a heavy steel sprocket with alloy- may wear a bit faster- and then using titanium disk brake bolts to bolt it on is a SUBSTANTIAL weight saving
If you can also drop the heavy steel tensioner it's another chunk of weight off the kit, and a 415 Industrial trike chain is barely half the weight of a kit chain-(rolls better too)

So- new stuff just keeps coming- a little slow though!

Still hoping for a lighter 33cc Chna girl for a classic steel road or touring bike. I think the warm days have come for a 15 lbs TOTAL weight kit that will roll along at 22-25 with light and fast wheels.

.crt.
 
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Nashville Kat

Well-Known Member
Apr 20, 2009
1,497
48
48
Jacksonville, Florida
OK- I just looked at the double threaded hub I have- and both sides are right hand thread-

so I'm SCREWED probably trying to use the $1.00 adapter, because it appears that the motor chain will just loosen the assembly, unless there's enough threads to put a lock ring on the outside (a bottom bracket lock ring is the same size and thread- did you know?

Anyway- the adapters may work well with a Flip Flop hub, and you then aren't limited to large flange and smooth sides to drill and maybe you have one or can find cheap- but the rear disk brake freewheel hub is probably the way I'd go these days.
 

crassius

Well-Known Member
Sep 30, 2012
4,032
156
63
USA
the screw on adapter may not work as the chain applies force in both directions (start & run)
 

Nashville Kat

Well-Known Member
Apr 20, 2009
1,497
48
48
Jacksonville, Florida
Took delvery on one of the disk brake adapters- a whopping 99 cents delivered so I thought I'd see about it
http://www.ebay.com/itm/30200418287...49&var=600803066188&ssPageName=STRK:MEBIDX:IT

I see one application for this- and it is a pretty good one=

The adapter is too wide once screwed on, leaving no more threads showing- I have one of those steel hubs with right hand threads on both sides- good for freewheel with cenntripical clutch-

HOWEVER- the adapter leaves no room showing for any additional lockdown- which would probably be little stop-gap and still unwind the right hand threads on the motor side-


anyway - thought I'd pass that along :-||
 
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maniac57

Old, Fat, and still faster than you
Oct 8, 2011
4,484
16
0
memphis Tn
Can you drill and lock it with a bolt or two?
All you need to do is stop it from turning, so maybe sink a bolt through adapter & flange?