I totally disagree and stand by what I said 100%.It depends on the aspect ratio.
205/40 needs at least a 7J rim, 205/45 needs at least a 6.5J rim, and 205/50, 205/55, 205/60, 205/65 need at least a 5.5J rim, and 205/70 needs at least a 5J rim.
VW sometimes fitted 205/55R16 tyres to 6J rims, such as the DAVOS which was fitted to cars such as the Golf and Touran from 2004-2016.
3 1K0601025Q aluminium rim
- DAVOS -
for winter tires6 JX16H2 ET50
5/1121K0601025Q 8Z8 bright chrome
Period: 0104 - 0705
Here's a photo from an ebay seller with 1K0601025Q rims (6J rim width) fitted with 205/55R16 tyres.
Toyo lists approved rim widths for the tyres that it sells.
TOYO TIRES - United Kingdom
www.toyo.co.uk
It's one thing looking online and quoting figures and another speaking from real world experience.
I agree the sidewall depth does have an effect as to the different widths of tyre you could fit on any said width of rim but to put a 205 tyre on a 5j rim would be simply ridiculous as the shoulders of the tyres would be significantly bent inwards and overstretched which would not only look wrong and ballooned but would significantly reduce the life of the tyre causing premature cracking/perishing of the rubber.
Similarly anyone who runs the standard 205/40 on standard 7j X 17 sport alloys knows there is little to no rim protection (although different brands of tyres do differ and some offer more protection than others) so again to say this size needs at least a 7j rim I simply don't agree with either.
I personally prefer a 215/40 tyre on the standard 7j rims and on a 7.5j X 17 TT, S3 or QT alloy is a requirement in my opinion as the 205 tyres look stretched otherwise.