Wheel change at Michelin
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Main effect of the change is that, with the new "U-type", the position of the nave relative to the rim has been reversed compared with the earlier pattern.
Visually, the two types can be distinguished by the position of the nave-to-rim weld. On the U-type, this has a larger diameter and the valve now passes through a hole in the nave rather than above the nave as with the original drop centre.
Consequently, access to the inner valve on twin assemblies is facilitated by the use of a rigid extension which has the effect of bringing the valve end well above the nave.
When tyres are being fitted to or removed from wheels, the outer face of the nave of U-type wheels must be placed on the floor, because it is essential to have the narrower bead seat uppermost.
To prevent the U-type wheel rocking on the floor, it is advisable to make up a suitable wooden frame where the nave can be supported While fitting or removing tyres. The construction change makes for a stronger wheel assembly, says Michelin.