Given
34%
while driving a
BMW E90 330i M Sport
(255/35 R18 W) on
a combination of roads
for 29,000
average miles
Front tyres are 225/40 R18W. I'd heard about run flats being hard. I hadn't quite expected them to tram line so badly (lorry grooves on motorways, uneven country roads, esp when wet, off camber straight roads). At times the wheel gets pulled from your grip nearly - as someone else noted. Tracking and wheel alignment were all fine in case you wonder, but when I changed the tyres (after a decent 29000 miles), the shoulders were really badly warn (down to 2mm or less) but the centre had maybe 5mm left. Some of this could be underinflation (but I check fairly often). Others have pointed out the hard sidewalls cause high shoulder wear, which I can believe. I've changed tyres for Conti SC3 all round (not RF) and it's like having a different car. Much smoother and tramlining is mostly gone. I've sacrificed the run flat safety/convenience, but I don't think the technology works well enough yet. Bridgestone have announced the 3rd gen of run flats with less rigid sidewalls, so that might be worth a go in the future, but I don't like this generation one bit.