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B25 Rear Brake compatibility #779629 07/24/19 10:01 pm
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tiger_cub Offline OP
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I have a drum 41-6090, does anyone know which brake plates can be used with this? I have options of B33 and some others although I haven't seen them as yet. 41-6093 will work but can't find one so looking at options. Looks like its 7" and needs to have the torque mounting opposite the brake cam. Is 68-6130 (A65) the same? Thanks


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C
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Re: B25 Rear Brake compatibility [Re: tiger_cub] #779659 07/25/19 3:53 am
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Gordo in Comox Offline
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What hub are you using? In 1968 the A65 alloy plate, Part 68- 6130, had a larger center hole (as compared to the B44 part) for a thicker fixed spindle that also needs a thicker long spindle to thread into it. I have seen one plate with a bushing/sleeve to reduce the size of the inside hole. Other than the hole size they seem to be the same.

The two plates side by side

[Linked Image]


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Re: B25 Rear Brake compatibility [Re: tiger_cub] #779669 07/25/19 10:11 am
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tiger_cub Offline OP
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Thanks, very useful I can get the one with the small hole but it might be an issue to get the internals, cams etc for it I think?


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C
Re: B25 Rear Brake compatibility [Re: tiger_cub] #780652 08/05/19 11:19 pm
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tiger_cub Offline OP
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I have what I need now except the spacers. Does anyone know the lengths of spacers 67-6032 & 47-6017? thanks


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C
Re: B25 Rear Brake compatibility [Re: tiger_cub] #780654 08/05/19 11:33 pm
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Gordo in Comox Offline
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Which parts book/model are those spacers listed in?

Gordo


The roadside repairs make for the best post ride stories.
Re: B25 Rear Brake compatibility [Re: tiger_cub] #780679 08/06/19 2:13 am
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tiger_cub Offline OP
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Sorry, should have mentioned they are the ones listed for the WD B40, which is the rear wheel I have. I will just have to make them from thick tube as they have gone missing.


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C
Re: B25 Rear Brake compatibility [Re: tiger_cub] #783189 09/01/19 1:39 am
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tiger_cub Offline OP
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Managed to get the inner spacer and on measuring distances they are the same length - 1/2". the inner one just has a flange on it.


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C
Re: B25 Rear Brake compatibility [Re: tiger_cub] #783297 09/02/19 6:11 pm
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Pelle Offline
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The flanged one, 67-6032, is (should be) .487" thick/wide, both in reality and according to the WD parts list. The list does not mention the width of 47-6017 (between brake plate and swinging arm) but it's 3/8" (on my WD and according to Rupert Ratio, volume 2, p. 123). As a sidenote, I think RR (same page) is wrong regarding the width of the WD spacer outside of the speedo drive, as there is no way a 7/8" wide spacer will fit there (but a 21/32" or so will).

Re: B25 Rear Brake compatibility [Re: tiger_cub] #783380 09/03/19 11:43 pm
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tiger_cub Offline OP
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Thanks for the info, 3/8" would be right as when I did a trial fit of the rear wheel, the one I made was too wide, easy fix I will cut it down. I also measured the speedo drive end spacer and its 3/4".


1966 Triumph Thunderville
1968 BSA B40M Roughrider
1970 TR6C

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