From 1937 onward they concentrated more on the competitive sports – side of motorcycling. Five men signed up for the Civil Patrol’s 24 hours endurance competition in Amsterdam.
It was March of 1937 is when this competition was held and eligible, there were people with an automobile, truck or motorcycle. A group with more 350 people started off, enduring rain and fog. Among those 5 men Sparta team, were the two sons of the founder: H. and J.J. Schakel.
The team did very well, the distance was driven at the prescribed speed of 40 km/h. This resulted in a good result for the class “under 60 kilograms”, because many of the other riders (riding heavier motorcycles) couldn’t finish due to failures. Mr. Valk from Voorschoten finished first at an off-road race in Tilburg and managed a fastest lap time in the 125-cc class.
At the grass- track races held in April of 1937, Sparta finished number 1 out of 14 contestants.

In 1938, light-motorcycle sales grew heavily, which of course had its impact on the sale of heavy–motorcycles. Sales were down considerably. The Dutch central statistics bureau calculated that in March and April of 1938, 524-to-633 motorcycles under 60 kilograms were imported, thus a total of 1157, while in the same period only 652 heavier machines were imported. Two third on the account of light motorcycles, mainly for professional use and less for tourism.

At the 1938 R.A.I. expo, following Batavus and Simplex, Sparta introduced the Sparta–Saxonette: a motorized rijwielnaaf. This caught the attention of many, especially bicyclists that had not yet made the transition to mass – motorization. The 60-cc Saxonette lacked a spring front suspension, however, this could be ordered separately. At this expo Sparta also brought the well known 100-cc Sachs, the 120-cc I.L.O., and some motorized tricycles.
A unique appearance was the 20 horsepower I.L.O. aircraft engine at stand no. 20, this was the smallest available aircraft engine at the time.
Still in 1938, the company from Apeldoorn organized a photography competition where one could win a Sparta motorcycle.