Of course you can but the question is should you. It is never recommended to go over 3% difference in overall diameter. The 225/40-18 will be 3.43% smaller in overall diameter. Your speedometer will read 62.1 at a true 60 mph. I would not recommend this swap.
No, that is not an acceptable substitute. There would be 10.2% too big, difference in overall diameter. You should never go over 3%. http://www.1010tires.com/Tools/Tire-Size-Calculator/225-40R18/245-50R18/225-50R18
225/45/r17 22-26lbs (summer vs. snow tire)275/40r18 summer tire 32lbs.2 1/2 kg
Can a 225/60R 16 tire replace a 235/70R 16 tire.
The 235 will be slightly wider than the 225, as long as your tires do not rub when turned from stop to stop it is a good swap.
I'm not certain of the exact answer because I think I've gone a little wider than stock. The important fact is that the backs are wider than the front, so there is no tire rotation!On 18" rims: Front = 225/45R18, Rear + 245/45R18. That's on my 2004 coupe.
No, this is not an acceptable swap.
I wouldn't, too much difference.
Yes. I've done it. Fits well.
YES, no problem.
Depends on the vehicle, that may be too big for full steering clearance.
Maybe, but it's quite a bit wider. Check for rubbing very carefully.
The owner's manual of your car will tell you which sizes of tires may be used.