How to Identify a Triumph Model From a Frame Number

Updated April 17, 2017

The earliest Triumph motorcycle model numbers and frame numbers were recorded in 1937. The numbering scheme for both the model numbers and the frame numbers was changed a total of four times before 1969. The numbering scheme was standardised in 1969 and continued through 1980. It is important to know your exact model number to ensure that you order the correct parts for your Triumph motorcycle.

Look up the frame number for 1968 and earlier Triumphs by using one of the three cross references cited at the end of this article.

Extract the model number for 1969 and later Triumphs from the frame number as follows:

First letter indicates the month of manufacture: A- January, B- February, C- March, D- April, E-May, G-June, H-July, J-August, K-September, N-October, P-November and X-December.

Second letter indicates year: C- 1969, D- 1970, E-1971, G-1972, H-1973, J-1974, K-1975, N-1976, P-1977, X-1978, A- 1979 and B- 1980.

Third section is a five-digit engine number.

Fourth section is the model number, i.e., T120R

Take the motorcycle or detailed photos to your local dealer to identify the model.


1969 and later Triumphs have the engine number on the left side of the engine directly below the cylinder barrel flange. The frame number is stamped on the left front engine mounting lug.

Things You'll Need

  • Frame number, typically located under the seat
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About the Author

Frank Gates started writing technical documents in 1980 as part of his telecommunications job. He is now a full-time technical writer. Gates has published two books, "Motorcycle Rider Basics" and "The Absolute Supervisor." He earned a technical diploma in electronic communications from the DeVry Institute of Technology.