205 x 55% = 112.75 = sidewall height
112.75 x 2 = 225.5 = 8.87795" + 16" (rim) = 24.87795 diameter
225 x 40% = 90 = sidewall height
90 x 2 = 180 = 7.08661" + 18" (rim) = 25.08661 diameter
As you can see, the diameter will be only 0.20866" larger, so I would say YES !
The equivalence is 225 50 R18 so that the diameter may be the same.
NO , rim size is incorrect.
Yes. I've done it. Fits well.
Yes, they can. They must be mounted as a pair.
Yes, that is reasonable
Yes they can
They are Taiwan designed and now made in China or Taiwan. I got NS-2 and my fronts (225 45 R18) have "made in Taiwan" mark and my rears (245 45 R18)have "made in china, designed in taiwan".
For Audi a4 b8 2 types of oem wheel i know are: 1) 8jx18 et47 5x112 central bore 66.6 with 245/40/R18 tyres offset (et) is 47 2) 7jx16 et39 5x112 central bore 66.6 with 205/60/R16 tyres offset (et) is 39
Yes.
R18
r18
Simple solution..........Delete r18 file & redraw it in r20.