Triumph 1925 Model P 494 cc side valve single combination frame#900789 engine# 216338
In the twenties Triumph had to fight hard for their market share.
Their answer to the competitors was a basic 500cc bike: it was very was cheap – £42.17s.6d -the type SD, also a 500 cc side valve single, was £83.00.
By using new mass production methods labour costs were cut.
There were some teething troubles with engine and clutch quality in the early series; when these problems were solved the design turned out to be very practical. More than 20,000 Model Ps were sold.
Compression ratio is 4.1 to 1, top speed about 54 mph. This combination is a matured restoration.