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info on my '70 t150t #200638
07/09/06 4:04 pm
07/09/06 4:04 pm
Joined: Jul 2006
Posts: 5
DFW
fearofx Offline OP
BritBike Forum
fearofx  Offline OP
BritBike Forum
Joined: Jul 2006
Posts: 5
DFW
i just picked up a new project bike. '70 triumph t150t. tridents are just plain cool. it's a basket case but there is enought there to make a real runner. here are my questions.

1) it have read a little about the t150's but there is little out there about the t150t's. what is the diference? i know there were only 268 made. can anyone help me with some info on this bike. i honestly just thought i was buying a trident to restore.

2) parts!! i know the ol trusty eBay has a lot of parts and things but i need new parts. shocks, cables, fork rebuild kit, badges, chain... you get the idea. this thing is a basket case. any help would be great.

pete

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Re: info on my '70 t150t #200639
09/03/06 9:38 pm
09/03/06 9:38 pm
Joined: Sep 2006
Posts: 2
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Jonathan P Offline
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Jonathan P  Offline
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Joined: Sep 2006
Posts: 2
The T150T began production in mid 1968. All units built prior to Jan 1969 have serial numbers T150T101 - ? I am the owner of T150T127, the 26th bike off the assembly line. after Jan 1969 serial #'s were T150T AC0101 and on. I do not know how many units were built in 1968 and would like information if you have any. These units were shipped to dealers in the US for 1969 model demonstration. Mine came from Free State Cycle in bladensburg Maryland.I have owned and ridden it for 33 years!

Re: info on my '70 t150t #200640
09/04/06 5:59 pm
09/04/06 5:59 pm
Joined: Jun 2002
Posts: 9,466
Scotland
S
Stuart Online content
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Stuart  Online Content
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S
Joined: Jun 2002
Posts: 9,466
Scotland
Hi,

Quote:
Originally posted by Jonathan P:
I do not know how many units were built in 1968
While triple production began sometime around late spring/early summer of calendar 1968, these were '69-season, not '68-season, bikes. The reason that production began well before the factories' summer holiday shutdown, which usually delineates the change from one season to the next, is that the BSA Group had decided to both launch the triples in the US in calendar September 1968 and have bikes in dealers' showrooms at the time of the launch.

Quote:
Originally posted by Jonathan P:
after Jan 1969 serial #'s were T150T AC0101 and on.
'Fraid not. Original factory records show the first bikes to appear with the five-figure number prefixed with month and season letters and either prefixed or suffixed with the model code were built in calendar September or October 1968.

The reason that early triples (both Tridents and Rocket 3's) appear with a three-figure serial and without a date code is down to when triple production started. The 'five-figure number' format was notionally introduced at both Small Heath and Meriden on all bikes (singles, twins and triples) after return from the calendar 1968 summer holiday shutdown, i.e. after many triple engines were built. Then, triple engines, although all built at Small Heath, weren't produced on a 'just-in-time' basis but were stored at either Small Heath (Rocket 3's) or Meriden (Tridents) and pulled out as required (and not in numerical order) when cycle parts were ready for engine installation. Finally, the 'frame number' is identical to the 'engine number' because the latter was copied on to the frame when a particular engine was installed in a particular frame. Thus, triples numbered in both formats appeared in calendar September and October 1968 because early-built engines were finally being reached at the back of big storerooms. wink

Hth.

Regards,

Re: info on my '70 t150t #200641
09/04/06 8:49 pm
09/04/06 8:49 pm
Joined: Sep 2006
Posts: 2
J
Jonathan P Offline
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Jonathan P  Offline
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Joined: Sep 2006
Posts: 2
Thanks for clearing that myth up! My teaching on the subject seems incorrect. Your explanation is by far the most credible and Roy Bacon and Ivor Davies are not clear in their books.
So, to make sure I understand, Engines were produced befor bikes. Engine T150T101 - ? were built prior to August 1968 and J?00101 was built after but prior to Jan 1969? My other trident has a # AC01632, Jan 1969. This meening the engine was built in that month and year.

Re: info on my '70 t150t #200642
09/05/06 12:25 am
09/05/06 12:25 am
Joined: Jun 2002
Posts: 9,466
Scotland
S
Stuart Online content
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Stuart  Online Content
BritBike Forum member
S
Joined: Jun 2002
Posts: 9,466
Scotland
Hi,

Quote:
Originally posted by Jonathan P:
Engine T150T101 - ? were built prior to August 1968 and J?00101 was built after but prior to Jan 1969?
Unfortunately, nothing absolutely definitive about every early Trident (like, say, the Meriden dispatch books) is available publicly, so we have to rely on less-comprehensive records. 'Triumph in America' by Lindsay Brooke and David Gaylin has a list of 'Changes To Ranges' in the appendix, based on Tri-Cor and JoMo documents. In this, the first T150 'modification from engine number' with five figures and a date code prefix is KC00496, the next two are higher three-figure numbers (520 and 566) without date codes, then all subsequent ones (from NC00692) are five figures with date codes. So, somewhere between Trident engines 566 and 692, Small Heath started stamping at least the five-figure number (note that the actual number series didn't return to (00)101 but continued).

Quote:
Originally posted by Jonathan P:
My other trident has a # AC01632, Jan 1969. This meening the engine was built in that month and year.
In theory, yes; however, where a definitive record is available, comparison between stamped codes and actual build dates often shows numerous anomalies. frown

E.g. the earliest date codes are known to have been stamped is with '71-season Rocket 3 engines, when date codes were stamped with the numbers at the completion of engine assembly, in the autumn months of calendar 1970; these were then duplicated on frames when final assembly took place ... in the early months of calendar 1971. eek

Otoh, the latest date codes are known to have been stamped is with some T160's, when they were stamped on engines and frames just before dispatch ... :rolleyes:

Hth.

Regards,



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