rattus wrote: Sat Oct 26, 2019 1:05 pm
Thanks for the follow up
Daft question, is your 6C on 17" or 18" wheels?
Our factory fitted Parabolica alloys are wearing 215/40/R17 boots.
Makes me curious about the size of the space saver...
The 18” space saver fitted with a 125/60 tyre is correct for the GTI with 17” wheels and 215/40 tyres.
My GTI also has 17” wheels and 215/40 R17 tyres. The diameter of an 18” space saver with 125/60 tyre is pretty much the same as the diameter of a 17” alloy with 215/40 tyres fitted. To get the overall diameter of the tyre + wheel you need to add the diameter of the wheel, plus the tyre sidewall height at the top of the wheel and tyre sidewall height at the bottom of the wheel. The sidewall height of the tyre is calculated by multiplying the tyre width by the sidewall aspect ratio, so for the space saver;
Tyre sidewall height = 125mm width x 60% = 75mm
Wheel diameter = 18”, converted to mm’s = 457.2mm.
Overall diameter of tyre + space saver = 75mm + 75mm + 457.2mm = 607.2mm
For the 17” road wheels;
Tyre sidewall height 215mm x 40% = 86mm
Wheel diameter; 17”, converted to mm’s = 431.8mm.
Overall diameter of tyre plus wheel; 86mm + 86mm + 431.8mm = 603.8mm
So only a difference of 3.4mm in diameter of a 17” wheel with a 215/40 tyre and an 18” space saver with a 125/60 tyre. 3.4 mm difference is negligible, especially when the space saver will only be used at speeds of up to 50mph and over a relatively short distance in an emergency to get you home and to a tyre depot to repair or replace your damaged 215/40 road tyre.