OnSpot Chainwheel Helmet, 190mm (0926-A)
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0926-A OnSpot Helmet for 190mm Chainwheel. When replacing your chainwheel, replace the helmet to protect the wheel from snow and ice.

It fits the wheel having a cast-in number of 5423-A (The L190 is a patent number).

Wheel Specifications to help;

Wheel Diameter is 190mm (7.48in) including the rubber.
The cast center measures approximately 159mm (6.25in).