Stuart,
Don't worry, you have not bought a pup. Slipperman is obviously & understandably still feeling very sore after his wheel failure at Rockingham.
If these cars are driven regularly on track things will break. Over the years I have broken practically everything on my various sevens at various times (including engine mtg brkts, engine, alternator& strap, clutch, gearbox, prop, diff mtgs, diff bolts & chassis) but never an MB wheel.
These wheels are very light but they do need looking after. At the very least a visual inspection after use (not made easier by the powdercoating & paint on road wheels) and annual crack testing & refurb (as described on MB's website).
Keith is a very fast driver who has done many hundreds of miles on track with these wheels. It is very unfortunate that his mag centre broke but I have seen wheel failures with other types & makes of wheel including those with alloy centres. Maintenance is an issue with the R500 wheels, and particularly so when they pass through several pairs of hands in the second hand market.
My advice (if you want it) take the wheels to Mike B for a crack test (removing powder & paint) & refurb this off season and enjoy them on track this year.
L7 FUN
Edited by - Paul Gibb on 25 Jan 2008 22:28:44