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QD rear wheel, replaceable sprocket #539833
04/25/14 1:06 pm
04/25/14 1:06 pm
Joined: Dec 2007
Posts: 468
Denmark
Ducknaldo Offline OP
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Ducknaldo  Offline OP
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My 1969 T120R has the quickly detachable rear wheel.

Id like to be able to replace the sprocket, without replacing the brake drum.
(Bought a "520" x-ring chain kit with narrow sprockets, but the rear sprocket is of the detachable type)

I seem to remember that a qd drum exist, with detachable sprocket. (37-1779)?

Anybody with such a drum for sale, links or info, feel free to chime in;)

Regards
John


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1969 T120
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Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539834
04/25/14 1:09 pm
04/25/14 1:09 pm
Joined: Oct 2013
Posts: 369
Essex England
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paul67 Offline
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i had one for sale on eBay last week that didnt sell
Paul

Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539836
04/25/14 1:14 pm
04/25/14 1:14 pm
Joined: Dec 2007
Posts: 468
Denmark
Ducknaldo Offline OP
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Hi Paul

Fast reply:)

Is it repro, nos or new?


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1969 T120
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539838
04/25/14 1:18 pm
04/25/14 1:18 pm
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paul67 Offline
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it was on a bsa bike that i imported from the usa last year the brake lineing looks ok and it has 10 holes for the sprocket

Re: QD rear wheel, replaceable sprocket [Re: paul67] #539839
04/25/14 1:26 pm
04/25/14 1:26 pm
Joined: Dec 2007
Posts: 468
Denmark
Ducknaldo Offline OP
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Hmmm...
My sprocket is with 8 holes only.
Were there 8 AND 10 hole versions of this drum?


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1969 T120
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539840
04/25/14 1:28 pm
04/25/14 1:28 pm
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Posts: 369
Essex England
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paul67 Offline
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yes i beleive it was a A65 from the sixtys

Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539841
04/25/14 1:37 pm
04/25/14 1:37 pm
Joined: Dec 2004
Posts: 9,375
Scotland
kommando Offline
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The BSA and Triumph QD setups are the same basic design but different parts so I doubt an A65 drum with fit a T120.

Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539842
04/25/14 1:46 pm
04/25/14 1:46 pm
Joined: Feb 2011
Posts: 3,475
Orygone
Boomer Offline

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Orygone
AFAIK, the splines were different between the BSA and Triumph. Also the hub was different. I believe the whole set-up is different. It would be nice if John could post a picture of the hub and drum that his T120 has.


Bill B...


Boomer
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539844
04/25/14 2:12 pm
04/25/14 2:12 pm
Joined: Dec 2007
Posts: 468
Denmark
Ducknaldo Offline OP
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Here is the drum type that I use today.





This is the sprocket I want to be able to use.



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1969 T120
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539859
04/25/14 5:37 pm
04/25/14 5:37 pm
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Posts: 3,475
Orygone
Boomer Offline

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Orygone
That is the Triumph type and I don't think that it was available with a bolt-on sprocket. The BSA, late pre-unit and unit used a QD drum with a 10 bolt bolt-on sprocket.

Bill B....


Boomer
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539909
04/26/14 2:54 am
04/26/14 2:54 am
Joined: Jun 2002
Posts: 9,950
Scotland
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Stuart Offline
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Hi John,

Originally Posted By: Ducknaldo
I seem to remember that a qd drum exist, with detachable sprocket. (37-1779)?

Fwiw, I've been messing about with Triumph qd rear wheel bits on-and-off for something like twenty years and this is the first I've heard of a Triumph qd hub with a detachable sprocket. Are you sure that isn't a BSA part number? Bear in mind that, when Triumph part numbers were translated to the BSA format in the early 1970's, Triumph "W" became "37", but that prefix was one used by BSA already.

If there is such a thing, it's so old and rare, if you find a usable one, I suggest you also buy a lottery ticket. smile

Perhaps more practically, the two sprockets have the same number of teeth and aiui, the bolt-on sprocket you have is a standard conical-hub one that's been machined down for the 520 chain. Would it not be simpler just to have the qd hub sprocket teeth machined similarly?

Hth.

Regards,

Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539914
04/26/14 3:44 am
04/26/14 3:44 am
Joined: Dec 2010
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Sunny Sussex, UK
tbird649 Offline
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That sprocket looks like 37-1499, to fit the bolt on non qd drum 37-1498. Not sure there was a qd version though.



Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539919
04/26/14 4:36 am
04/26/14 4:36 am
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paul67 Offline
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this is the bsa one i have it was on a A10 Spitfire with a 58T sprocket

Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #539950
04/26/14 10:10 am
04/26/14 10:10 am
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Denmark
Ducknaldo Offline OP
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It would definitely be easier too "shave" the sprocket on the 37-1040 drum.
But I d really like like to be able to just replace the sprocket, as I have several of these sprockets lying around.

I guess I could ask a machinist of some kind to modify the 37-1040, to allow for the replaceable sprocket to be mounted.

I found a thread on triumphrat.net, mentioning the drum in question, but this guy could of course have misunderstood something.
http://www.triumphrat.net/classic-vintage-and-veteran/72396-qd-quick-detach-rear-hubs.html

("Slicktero" mention it about halfway down the page)

Edit.: The sprocket also seems harder and better quality than the original qd sprocket and Im not sure a shaved original sprocket would last very long if shaved down to around half width.

Last edited by Ducknaldo; 04/26/14 10:15 am.

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Run `em...
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1969 T120
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #540032
04/27/14 2:22 am
04/27/14 2:22 am
Joined: Jun 2002
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Stuart Offline
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Hi John,

Originally Posted By: Ducknaldo
I could ask a machinist of some kind to modify the 37-1040,

But, unless you found someone familiar with what you want to do, you'd have to come up with the mounting arrangement that you want:-

. Risking telling you something you know already, it isn't a matter of turning the teeth off the drum and boring eight holes to match the sprocket; that would put the sprocket out of line. frown Afaict, the teeth have to be machined off the drum, then what remains must either match the i.d. of the sprocket or it must be machined too; then you've got to work out a way of fastening the sprocket edge-on to the drum.

. I'm not saying it can't be done, but I reckon you need someone more than just "a machinist of some kind".

. Years ago, I remember reading that qd drums were modified for different numbers of teeth; trouble is, it's so long ago I can't remember how it was done. frown Perhaps look around the www for a forum that deals with classic motocross and/or trials and see if anyone's still using and modifying Triumph qd drums?

Originally Posted By: Ducknaldo
The sprocket also seems harder

Which isn't going to help any machinist. frown

Have you considered a standard 3/8"-width chain and lubricating it with something like a Scottoiler? whistle grin

Hth.

Regards,

Re: QD rear wheel, replaceable sprocket [Re: Stuart] #540033
04/27/14 3:29 am
04/27/14 3:29 am
Joined: Dec 2007
Posts: 468
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Ducknaldo Offline OP
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Hehe

I do use a Scott Oiler, but would like to ditch it:)

Now.
Im not a machinist, but I reckon, that the modification wouldnt be that hard for a well trained machinist.

The way I think it could be done is by fabricating a "mounting disc" that fits directly behind the existing sprocket, slide fit at first.
Then shaving off existing teeth on drum-sprocket.
Finally weld the mounting disc in place behind the now shaved sprocket.
Unfortunately the new sprocket, will not slide in from the drive side, because of the lip, but this could be overcome by either shaving this flange just a tiny bit or shaving the inside of the sprocket just a tad.

Im not sure how much welding could be done on the drum, before it deforms, but probably this could be done.


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*******************
1969 T120
Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #540036
04/27/14 4:07 am
04/27/14 4:07 am
Joined: Dec 2010
Posts: 678
Sunny Sussex, UK
tbird649 Offline
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I'm just wondering how many miles you are going to do on this bike to warrant all the work involved? Those sprocket/drums last a long time, if you want to change the gearing then engine sprockets are relatively cheap, and easy to change.



Re: QD rear wheel, replaceable sprocket [Re: Ducknaldo] #540048
04/27/14 7:24 am
04/27/14 7:24 am
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Posts: 9,950
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Stuart Offline
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Hi,

Originally Posted By: tbird649
just wondering how many miles you are going to do on this bike to warrant all the work involved? Those sprocket/drums last a long time,

Originally Posted By: Ducknaldo
Bought a "520" x-ring chain kit with narrow sprockets,

Originally Posted By: tbird649
if you want to change the gearing then engine sprockets are
easy to change.

Ye-ea-ah ... after you've removed the entire primary drive ... Then, having changed the sprocket, you have to rebuild the primary (remind me, how many individual clutch rollers are there?) and, having finished, you have to hope it doesn't leak from one of the myriad gaskets and seals ... whistle

Originally Posted By: Ducknaldo
I do use a Scott Oiler, but would like to ditch it:)

shocked

I don't mean to hijack your thread, but why?

Because, ime, (expensive) 'O'-/'X'-ring a hell of a lot longer if they're lubricated. Back in the 1990's, I commuted in all weathers on various old Jap bikes; ime, what did for unlubricated '-ring' chains was the rings hardened from being heated by the chain (feel the friction in it now, it doesn't get any better with use eek ), then they cracked and broke up, letting the lubricant out and water and grit in. frown In 1991, I fitted a Scottoiler with a new 'O'-ring chain-'n'-sprockets; in the following year, the bike covered about 10,000 miles. I still own the bike, those chain-'n'-sprockets are still on it, the rear wheel adjusters are about half-way along their travel.

The huge advantages I found when I used a bike every day were:-

. it was just a matter of adjusting the pump for more/less lubricant depending whether the roads were were wet/dry;

. I could, and did, get home late from work, put the dirty, wet bike in the garage, go on holiday early the next morning for two weeks and, when I returned home, the bike's chain would work normally, rather than being a rusty, seized mess. bigt

Nowadays, I can leave a Scottoiler-equipped bike literally for months between uses and, when I want to use it again, one thing I know won't need any attention is the chain. I've been gradually fitting all my bikes with Scottoilers, with 'normal' chains (on Fraser Scott's advice) because the additional cost (and on Britbikes, the need to faff around with 520 chains and special sprockets wink ) of 'ring' chains isn't justified for the number of miles each bike covers.

Luck with your task, but I'd interested to know the problem that needs such a solution. confused

Regards,

Re: QD rear wheel, replaceable sprocket [Re: Stuart] #557787
08/11/14 5:28 am
08/11/14 5:28 am
Joined: Dec 2007
Posts: 468
Denmark
Ducknaldo Offline OP
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@Stuart

I decided to keep the scottoiler after all.

I investigated the claims that some o-ring chain(530) does fit these bikes and learned that DID make an x-ring chain thats even slimmer as their o-ring chains, which also fit.
I kept my standard sprockets and bought a DID 530VX. Fits with lots of room to spare and keeps chain maintenance to a minimum.
This chain and the scott oiler makes touring more of a pleasure.


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Run `em...
*******************
1969 T120

Moderated by  John Healy 


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