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#717785 - 12/05/17 3:30 pm A10 TLS Front brake  
Joined: Nov 2006
Posts: 28
hopski Offline
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hopski  Offline
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WALES
Hi, hoping to get some knowledge from you guys again.

I have a 1959 A10 rat bike and I don't rate the front brake even though I've ridden it for 30 years. I have a pair of 1969 A65 forks and matching BSA TLS front wheel. The question is, can I just swap out the A10 forks for the A65 ones and fit the TLS front wheel?

The yolks "look" the same dimensions so it looks like an easy job, but nothing is ever easy I've found, I just know there must be a catch somewhere.


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#717787 - 12/05/17 3:37 pm Re: A10 TLS Front brake [Re: hopski]  
Joined: Dec 2004
Posts: 8,947
kommando Online content
kommando  Online Content


Joined: Dec 2004
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Scotland
What brake do you have in the A10 currently, the yoke width for the 8" single sided front brake fitted to a B44 Victor Special (which is a derivative of the A10/Gold Star version) is the same as the 69/70 B25 and B44 Shooting Star and this has the 7" TLS, so even if the axle is different there is an axle that will fit. You would need the B25 69 or 70 parts book and the A65 69 or 70 parts book and check the axle numbers.

#717788 - 12/05/17 3:45 pm Re: A10 TLS Front brake [Re: hopski]  
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wak Offline
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wak  Offline
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derby england
straight fit no problem


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#717809 - 12/05/17 6:08 pm Re: A10 TLS Front brake [Re: kommando]  
Joined: Jun 2002
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Stuart Online content
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Stuart  Online Content
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Scotland
Hi,

Originally Posted by kommando
What brake do you have in the A10 currently, the yoke width for the 8" single sided front brake fitted to a B44 Victor Special (which is a derivative of the A10/Gold Star version) is the same as the 69/70 B25 and B44 Shooting Star and this has the 7" TLS, so even if the axle is different there is an axle that will fit. You would need the B25 69 or 70 parts book and the A65 69 or 70 parts book and check the axle numbers.

Uh-uh. O.p. posted, "I have a pair of 1969 A65 forks and matching BSA TLS front wheel. The question is, can I just swap out the A10 forks for the A65 ones and fit the TLS front wheel?"; if the A65 yokes fit the A10 frame, the axle is irrelevant - '68-on, BSA singles, twins and triples (bar weird things like Victor Specials?) used exactly the same front wheels as Triumphs, including brakes, including axles. In every year, Triumph used exactly the same axle on every range.

Hth.

Regards,

#717812 - 12/05/17 6:22 pm Re: A10 TLS Front brake [Re: hopski]  
Joined: Dec 2004
Posts: 8,947
kommando Online content
kommando  Online Content


Joined: Dec 2004
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Scotland
Quote
if the A65 yokes fit the A10 frame, the axle is irrelevant


Hopski has the A65 forks and wheel, no mention of A65 yokes in his post so you have to assume he has retained the A10 yokes so the axle is a potential change needed.

#717832 - 12/05/17 8:25 pm Re: A10 TLS Front brake [Re: Stuart]  
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VicCyclone Offline
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VicCyclone  Offline
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Quote
the axle is irrelevant - '68-on, BSA singles, twins and triples (bar weird things like Victor Specials?) used exactly the same front wheels as Triumphs, including brakes, including axles. In every year, Triumph used exactly the same axle on every range.,


Not so! 1968 A50 Royal Stars and A65 Thunderbolts still had the 8" SLS single side brake. 1968 Lightnings and Firebirds used the one year only clamp up damper rod forks which require a shorter wheel spindle, - 37-1641 as used on 65 -68 Triumph SLS wheels. 69 and 70 shuttle valve BSA forks will take the same spindle as Triumphs with the TLS brake -- 37-2057.


VicCyclone

1965 A50 Cyclone Clubman
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2009 HD FXDC
#717866 - 12/05/17 11:32 pm Re: A10 TLS Front brake [Re: hopski]  
Joined: May 2013
Posts: 4,560
Allan Gill Online sleepy
Allan Gill  Online Sleepy


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Rotherham - S. Yorkshire
Afaik, there is little diamensional difference between A10 and A65 fork stanchion spacing.


beerchug
#717888 - 12/06/17 4:14 am Re: A10 TLS Front brake [Re: VicCyclone]  
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Stuart Online content
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Stuart  Online Content
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Scotland
Hi,

Originally Posted by kommando
Quote
if the A65 yokes fit the A10 frame, the axle is irrelevant

Hopski has the A65 forks and wheel, no mention of A65 yokes in his post

That's one reason why I qualified the the statement with "if" ...

Originally Posted by VicCyclone
Not so! 1968 A50 Royal Stars and A65 Thunderbolts still had the 8" SLS single side brake.
37-1641 as used on 65 -68 Triumph SLS wheels.

Apologies for my lack of clarity, I'm not well up on the minutiae of '68 BSA variants,

However, I am well up on the minutiae of Triumph front brakes and hubs. 37-1641 isn't peculiar to SLS wheels, it's also used on the '68 TLS, except on early triples. Conversely, in '69, the 7" TLS wasn't introduced 'til part-way through the year; before that, the SLS was fitted on the longer '69-on axles.

It has to do with Triumph forks:-

. Pre-'69 (except on early triples), Triumph yokes place the leg centres 6-1/2" apart whereas BSA yokes place the leg centres 6-3/4" apart.

. '68 BSA models - singles or twins - using Triumph brakes require the relevant one-year-only '68 BSA sliders because both SLS and TLS Triumph brakes are on the shorter 37-1641 axle.

. '69-on, Triumph yokes also place the leg centres 6-3/4" apart and the axles - 37-2057 and 37-3582 - are longer.

. Digressing slightly with apologies to "hopski", all triples - whether built during the summer of 1968 or after the change to the '69 model year - had 6-3/4" forks. However, the ones built before the change to the '69 model year had the '68 TLS, but on the longer axles because the fork legs are 6-3/4" apart.

So, if "hopski" has the '69 A65 yokes and if they fit the A10 frame, "the axle is irrelevant".

Otoh, if "hopski" intends to use A10 yokes, we need to know the "little diamensional difference between A10 and A65 fork stanchion spacing" alluded by Allan before the axle becomes relevant.

Hth.

Regards,

#717894 - 12/06/17 7:35 am Re: A10 TLS Front brake [Re: hopski]  
Joined: May 2013
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Allan Gill Online sleepy
Allan Gill  Online Sleepy


Joined: May 2013
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Rotherham - S. Yorkshire
As far as I am aware the only difference between the later pre oif A65 and the A10 is the bolt size on the bottom yoke (from 3/8-7/16??) and the fact the late bikeshad that bolt thread into the yoke, unlike the A10 and earlier A65 with the smaller bolt which relied on the nut alone. (Willing to be corrected on that)

On the top yoke I believe the pinch bolt is different also- taper from memory. But I’ve seen people fit TLS front wheels complete into A10’s with no spindle Change.


beerchug
#717897 - 12/06/17 9:42 am Re: A10 TLS Front brake [Re: Allan Gill]  
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Posts: 28
hopski Offline
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hopski  Offline
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WALES
Thanks for the information guys excellent as always. My A10 has the full width hub brake. I don't have the A65 yokes sadly so I'm hoping the A65 folks will side straight in and the wheel afterwards.


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#717918 - 12/06/17 3:09 pm Re: A10 TLS Front brake [Re: hopski]  
Joined: Aug 2001
Posts: 2,510
MikeG Online content
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MikeG  Online Content
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New Hampshier USA
If I recall correctly, when I fitted an 8 inch TLS to my 61 A10 all I had to do was extend the brake anchor point so it engaged the fork leg fully. Not sure which axle I used, from the TLS or the original iron full width hub brake, but it went right in no problems.


1960 BSA A10
2007 Suzuki Bandit
1957 A10
(Used to be a Triumph here)
71 Norton Commando

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