You'll get just a very small amount of stretch, bugger all really... and yes the tread will be reduced by 10mm but you'll barely notice it especially with a slightly higher profile tyre in the 45 series.
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If the wheel is already stretching the rubber I fear it would be just as bad with 1cm less width on the tread...I guess it would be safer to just stick with 215/40r17...I just dislike the fact that I have minimal choice =/
Currently the load rating is 87w...would it be dangerous to go 83w load rating?
I don't know how hard you've been looking but there's a plethora of 215/40R17 tyres out there, and with good reviews might I add.
Federal 595 RSR
Federal 595 EVO
Federal 595
Advan Neova AD08
Yokohama Parada
Yokohama S Drive
Bridgestone RE002
Toyo Proxes 4
Kumho ECSTA KU31
I'll stop there for now.
what are your thoughts on these?
PIRELLI 215/40R17 83W PZERO NERO | PIRELLI PZERO NERO Tyre - OzzyTyres
at 83W is that alright for the Polo in terms of load?