Tire size for e34/540/6 with 18s

[540ii]

I just won an auction for a set of Kumho Ectasa 711s that are size 225 40 18 all around. I am wondering if these are suitable for 18 X 8 rims (M5 replicas) on an e34 540/6. I know that the recomended size is 235 40 18 but are these good enough? Will I notice any difference? Anybody have experience with these tires? Any input is appreciated. Thanks.

[Alan_525i]

This should answer any and all tire size questions.

http://alan.akarally.com/Tire Size Calc.xls

[540ii]

thanks for that....I don't quite get it though. Does anybody have experience with 225 40 18 on 18 X 8 rims on an e34?

[Paul in NZ]

for wheel and tyre size information on E34's look here (http://www.bmwe34.net/e34main/upgrade/wheels_upgrade.htm)

[angrypancake]

225 is kinda small. i was running 225/35/18 and the ride quality sucked ass

[Paul in NZ]

these sizes retain o/a diameter
235/40-18
245/40-18
265/35-18