Trojan wheel studs are the ‘splined’ type and are ‘press fit’ into holes drilled in the hubs. Early model studs had a smaller diameter spline than the current versions but are now unavailable. To fit the current studs, the holes in the hubs will need to be re-drilled to 13.75mm or 1 7/32”. Trojan wheel nuts have ‘tapered seats’ and suit all common wheels. Nuts have ‘tapered seats’ and suit all common wheels.