14 April 2015

Lambretta Wheel Rim Failure During Tyre Change

This wheel is from a 1955 Lambretta 150D and the original (Australian made) Olympic tyre had to be changed due to its age. When inflating; after re-assembling the wheel with a new tube and tyre, two of the three studs failed (see photographs below).

Even at the recommended pressure (14 - 25 psi) a failure of the studs and explosive separation of the rim halves is dangerous.

Its possible that sometime in the past the stud nuts were over tightened 'necking' the studs which may have weakened the 'T' section of the stud.

Disassembly (original 'sand beige 8029')

Stud bore

Studs

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