Upper frame tubes that followed the contour of the fuel tank were a notable feature of Iver Johnson motorcycles, including this 1915 model.

1915 Iver Johnson Pictures

While attempting to incorporate interesting design points, the 1915 Iver Johnson was ultimately a beautiful machine with little power.

Distinctive elements included the painted crankcase guards and cast floorboards.

The sharp angle between the intake manifold and head did not encourage efficient engine breathing.

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