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Joined: Aug 2001
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Would anyone here have “convenient” access to a dimension that would be considered the maximum for wear on the TLS front and rear A65 brake drums? Of course I’m sure others and myself have just gone on and used them as long as possible. I have some I want to list, and was hoping to represent the condition with decent accuracy,…. Besides being clean and shiny!


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
BSA on eBay
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So far, in the Shop manual and a Haines book, not finding any mention of a max limit. I guess that was never going to be an issue!
Actually, aside from the size of the drum raising a concern regarding failure, the increased size and the shoe radius/arc with less contact area surface is more important as far as stopping power!
Old timers (like me) recall having new brake shoes “arced” at the auto parts store, before the asbestos fuss outlawed that service. Now we mess with sand paper in the garage, which I’m sure is a whole lot better for health….. And since brake shoes can’t even BE asbestos anymore, all those trashed arcing machines are gone for no valid reason.


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
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I've never heard of a drum collapsing due to thinning of the casting. I've filed the wear lip off many a car drum, tend to last the life of the vehicle.

I had the front drum of my A65 skimmed in a lathe as it was slightly oval, luckily the local machine shop had a lathe big enough to do it without removing tyre!


a
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When you can see the shoes through the perforated drum, i'll usually change it.

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When I sent my front wheel in for skimming, over size shoes were also fitted.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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Originally Posted by Allan G
When I sent my front wheel in for skimming, over size shoes were also fitted.

Interesting! Even though I’m not building up a brake assy at the moment, curious where you find oversized shoes? Up to this point, wasting a good portion of the new lining has been the only way I knew to match the shoe to the oversized drum.


Down to ‘69 T120R now a Tr6R tribute bike
‘70 TR6C “happy in the hills”
‘67 A65L numbers match, “best effort” from basket *
Gone:
‘66 A65L“in ‘95 getting back in the game”+ empty ‘67 Case&Frame *
‘69 A65L
‘68 A65L “red bike” basket, sold & made whole by BB member
‘68 A65F nice Tribute bike
‘65 A50L bitsa from spare parts, Son’s fun
‘62 A10 Spitfire
‘65 T120R sad case, saved by BB member
'65 XLCH “scratched THAT itch”……
‘93 K1100RS heavy metal (should be gone, still here…)
Joined: Dec 2004
Posts: 11,696
Likes: 278
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Posts: 11,696
Likes: 278
Quote
curious where you find oversized shoes?

In the UK both Villiers Services and Saftek will fit linings to suit a given bare shoe fitted OD size and the drum ID size, minus 40 thou to give initial clearance. This is effectively a free service as they charge the same for standard sizes vs custom sizes. The shoes end up being so close to the drum they only need a few miles to bed in and become like arced shoes.

Vintage brake do or did a similar service in US at quadruple the price.

Quote
Send us your shoes only. Reline only. $139.95 per pair (of shoe linings), plus return freight.

Last edited by kommando; 03/31/22 2:31 pm.
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Originally Posted by kommando
Quote
curious where you find oversized shoes?

In the UK both Villiers Services and Saftek will fit linings to suit a given bare shoe fitted OD size and the drum ID size, minus 40 thou to give initial clearance. This is effectively a free service as they charge the same for standard sizes vs custom sizes. The shoes end up being so close to the drum they only need a few miles to bed in and become like arced shoes.

Vintage brake do or did a similar service in US at quadruple the price.

Quote
Send us your shoes only. Reline only. $139.95 per pair (of shoe linings), plus return freight.

It was Safetek that did mine, I couldn’t remember the name, I went one week and dropped it off then went back the next and picked it up. The drum was .040” out of round (or that’s what he skimmed off) spot on after though


Originally Posted by KC in S.B.
Originally Posted by Allan G
When I sent my front wheel in for skimming, over size shoes were also fitted.

Interesting! Even though I’m not building up a brake assy at the moment, curious where you find oversized shoes? Up to this point, wasting a good portion of the new lining has been the only way I knew to match the shoe to the oversized drum.


I think one big issue with trying to use standard shoes with an oversize drum is the cam is already in effect, meaning your probably not going to get the best from your brake - I think.
It’s one big advantage with the snail cams on the conical hubs (like drums on cars) the point of leverage and the cam is (or should be) in its correct starting position, the shoe is moved out to accommodate. Though still not as beneficial as an over sized shoe, you’ll get a little more wear out of the shoes before feeling the need to change them.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)


Moderated by  Allan G, Jon W. Whitley 

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