Riley Tricar 4hp (1905-07)

Photo courtesy of Alan Teeder

For 1905 the Forecars were replaced with a range of Tricars. However, whilst the larger engined models had a completely new chassis, the smaller models were essentially the same frame as the old Forecars, but without pedals. Even so, they were looking less like 3 wheeled motorbikes, and much more like cars, particularly as they were developed over the years. The engine was the same water-cooled 4hp unit as had been used in the larger of the Forecars, but the frame had been further improved and strengthened, and the drivers saddle was replaced with a seat. The smaller engined versions were not improved to the same extent as the larger engined models over the two years of production.


Single Cylinder
RAC Rating 4hp
Capacity 517cc
Bore86 Stroke 89
Carburation Longuemare Updraught


2speed Riley gearbox.
1st g/r 5.4:1 2nd g/r 3.57:1
Optional 3-spd:
2nd g/r 3.86:1 3rd g/r 3.33:1


Springs at front.


Front Band Brakes, Rear Block Brake.




Frame Size 23" (aprx. 580mm)
Wheelbase 4'5" (aprx. 1350mm)
Front Track 3'3" (aprx.980mm)
Wheels Dunlop tangentially spoked
Tyres 26x2 front / 26x3 rear.
Fuel Tank 2 galls


89 5s