On the standard drum-braked Commandos, the mudguard itself acted as a very effective fork brace, Most of the disc brake models have at least one of the mudguard struts missing and some modified systems have no struts, aftermarket mudguards often offer little in the way of bracing. So, given our never ending quest for safe and effective braking for old bikes under contemporary circumstances, many owners feel that a fork brace is a useful addition. I recall reading that in the cafe-racer culture of the 60s many aspiring street racers rendered their Triumphs almost unrideable by the substitution of a fibreglass front mudguard with no structural rigidity and a fibreglass tank, where the solidly mounted original steel tank acted as a frame stiffener. A salutory lesson that sometimes the designs of our old bikes were more holistic than we might appreciate and we should consider this when carrying out piecemeal modifications on our machines.