M Series Alloy Wheels - a safety note

Recently I've been working on the 3000M since the weather's been great for September/October. I started on an overhaul I wanted to do years ago, but circumstances dictated otherwise. Anyhow, I had to remove a tyre from a back wheel as the bead area was never cleaned up on that one. Sure enough, corrosion had started to work its way under the (very thin) TVR original powder coating. The tyre was dead easy to remove using my manual tyre changer given the tiny 14" T Slot Rim size & the not so low profile tyres (modern tyres can be really tricky to remove manually). I hadn't removed a tyre on the TVR for ages, & had totally forgotten that the rims have a bead safety "bump" only on the outer bead of the tyre. The inner bead seat has no such bump. What does that mean? It's fine when the tyre is inflated correctly. However, if the tyre is under inflated (or totally flat), the tyre bead on the inner side is able to slide off the bead seat more easily, & so a sudden blowout could occur. I understand this was a feature of some other TVR wheels on later models also. The wheel type is an "H", as opposed to later alloy & steel wheels which are denoted "H2". During heavy cornering, it is especially important to monitor your tyre pressures & make sure none are lower than the specifications (see my Technical Data page).

Tatty rim - you can see why the tyre was losing pressure

After some bead area restoration (the wheel is due a full refurb soon)