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Dominator front end questions #229008 12/21/08 3:19 am
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Tom Sanders Offline OP
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hey guys

I'm trying to fit a commando twin leading shoe (TLS) drum brake to the front of a '62 650SS. I'm using the original dommie fork tubes, commando sliders (lower end of fork) and the TLS brake.

It seems like the TLS drum is slightly too wide for the dommie front end. Is this arrangement a direct fit or is a mod required?

Is the dommie front end 7 inches or 7 3/8 inches wide?

Can I run a 4:10 width tire on the front?


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT (currently up on blocks)
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: [email protected]
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Re: Dominator front end questions [Re: Tom Sanders] #229009 12/21/08 3:30 am
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VA Rebel Offline
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Originally Posted by Tom Sanders

Is the dommie front end 7 inches or 7 3/8 inches wide?


I think you're going to need the later model trees.

Re: Dominator front end questions [Re: Tom Sanders] #229029 12/21/08 10:59 am
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L.A.B. Online Content
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Originally Posted by Tom Sanders
Is the dommie front end 7 inches or 7 3/8 inches wide?


Forks were 7 3/8" from 1964.

Re: tor front end questions [Re: Tom Sanders] #229040 12/21/08 1:13 pm
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Dave Comeau Offline
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This subject or similar had been discussed a while back.
While the front end is narrower it seemed like Gary declared the correct RH lower fork leg boss was narrower to make up for the narrower triple trees. The brake drum should be the same... so it's orientation should be based on the brake backing plate thickness.
I don't own a 7" set up so I can't check. are you using any later front end parts?...lower fork legs?


dynodave
BSA 3 1961-1963
Ducati 3 1992-2002
Norton many 1951-1975
87 Serv-Equip 100HP MC brake dynamometer,
Re: tor front end questions [Re: Dave Comeau] #229060 12/21/08 3:26 pm
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Tom Sanders Offline OP
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Dave,

I'm using the original 1962 dommie fork tubes, original 1962 triple trees (which, must be the 7 inch width) commando sliders (lower end fork legs) and the commando TLS brake.

Sounds like I'm screwed unless I can find some '64 or later Dommie triple trees or go back to the original single leading shoe brake.


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT (currently up on blocks)
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: [email protected]
Re: tor front end questions [Re: Tom Sanders] #229093 12/21/08 8:00 pm
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johnm Offline
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I beleive it should be possible to do this but you will need to do some machining. My Dommie with 7 " yokes came with a Norton twin leading shoe brake plate fitted. Unfortunately I had to change it back because the rules of the class I race it in require a single leading shoe.

The only thing Im not sure about is the Commando sliders. Mine has normal Dommie ones.

The brake plate was machined to fit and I think the brake anchor point was machined as well. This may be where the Commando sliders will be a problem. You may need to recentre the wheel and if you are very unlucky respoke. You might have to modify the axles too. All lath work.

7 3/8 yokes are not hard to find at least in NZ -and you can buy them new as well if you are rich. (Emery, Hemmings etc) There are some very fancy billet ones available if you want to go crazy.

The 7 3/8 would give you more tyre options. I use an Avon 90/90 18 on my bike with 7 in yokes. Tyre vary so much with profile I think it would be hard to predict fit until you try it.

Last edited by johnm; 12/23/08 3:52 pm.
Re: tor front end questions [Re: johnm] #229300 12/22/08 11:00 pm
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douglas Offline
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I fitted the twin leaders to my original drum hub about thirty years ago without too much trouble. But that was with original forks? [Linked Image].

Re: tor front end questions [Re: johnm] #229307 12/22/08 11:36 pm
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oilyrag Offline
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The problem is the Commando sliders, if the forks were standard the 2LS brake would go straight in, if you can't get the 7 3/8" yokes machine the extra 3/16" off the brake side slider (spindle boss and brake anchor too, I think).If you do widen the fork you'll also need a post 1964 spindle and if its Commando the nut as well, oh, and also new mudguard bridge studs and a lot of 3/16" spacers (including one each side of the headlamp). As far as I know all Dommy/Bendy front wheels are spoked up central, no offset, so that should be OK. If you plan to ride it in the rain AT ALL blank off the front air scoop, not kidding. Finally, after all this work, don't expect any dramatic improvement over the original sls brake.
Good luck!


Oil is always cheaper than metal
Re: tor front end questions [Re: oilyrag] #229394 12/23/08 3:19 pm
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Tom Sanders Offline OP
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Oily,
Still evaluating options here but thanks for everyone's input.

I still have the original SLS sliders. I'll fit 'em up and give 'em a try with the 2LS brake assembly. I was looking all over my garage last night for the original SLS brake plate but could not locate it -- hate it when that happens.


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT (currently up on blocks)
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: [email protected]
Re: tor front end questions [Re: Tom Sanders] #229534 12/24/08 4:11 pm
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The Artful Bodger Offline
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Here is a link to where this was brought up before by myself. It is all to do with matching sliders to yokes.

Good luck,
Alastair


Black Shadow of the Vincent falls on the Triumph line,
I've got my motorcycle jacket but I'm walking all the time...

1942 BSA M20
1956 Pre-unit Triton project/money pit

http://tritonproject.blogspot.com/
Re: tor front end questions [Re: oilyrag] #229627 12/25/08 3:59 am
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Tom Sanders Offline OP
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Oily,
You rock! You were dead on. I changed back to the original SLS sliders this afternoon and the 2LS assembly slide in without a hitch. Thanks much.


LONG LIVE LOCKTITE

74 Roadster 880cc
1962 Norton 650SS
75 Ducati 860GT (currently up on blocks)
1968 Commando Fastback SN 126157
1975 Honda CB400f AHRMA racer #842
email addy: [email protected]

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