Triumphrat

srss · 04-17-2009, 12:19 AM

i have a 1970 t-120r and its has a bolt on hard tail kit on it and im converting it back to a swing arm! i was wondering what swing arm years can i use! and any other info or pics would be helpful!!!

Sunshine Jim · 04-17-2009, 02:07 AM

welcome to the gang.

heres the links to the workshop manuals and parts lists, both pretty handy to have with some pix that might help :

http://www.classicbike.biz/Triumph/Triumph.htm

Or

http://www.choppedtriumphs.net/BOOKS.html

upstateTrophy · 04-17-2009, 08:45 AM

I checked J.R. Nelson's book "Bonnie, the Development History of the Triumph Bonneville" [ISBN: 0 85429 257 8]. Looks like there were changes in 68 and 69, but no more in 70.

Here is a quote for the 68 year:

"Frame: A new front frame incorporating a new headlug with extended steering lock shelf (to prevent the possibility of riding off with the lock peg still engaged) and a new swinging arm was introduced. ....The new swinging arm had heavier corner fillets, and thicker section tube (14SWG to 12 SWG) was used from DU81196, providing a considerable increase in rigidity."

For 69, he stated the following, which is ambiguous to me, and contradictory:

"Frame - There were no recorded changes for 1969".

But under the Rear Suspension for 1970, he states: " The new swinging arm was identical to the previous year but manufactured in a heavier gauge material."

So it looks like anything from 68 on would be suitable. I am not sure what he means by the reference to heavier gauge material for the 70 swingarm.

Hope this helps.

GrandPaulZ · 04-17-2009, 10:20 AM

srss - welcome to the forum!

You can go all the way back to '65 if you don't need it to be all original, aren't over 175#, and aren't going racing.

(right up through '70)

srss · 04-19-2009, 07:55 PM

Cool!! Thanks guys for all that info it help out a lot!!!!