So, I didn't realise the 35 in the 255/35/19 means the side wall is 35% of the 255mm width. I just presumed it was a MM measurement to a certain point of the wall.
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Sidewall height...I didn't realise that....
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Sidewall height...I didn't realise that....
Yes that why the staggered wheels on the e89 take 255/30 rear and 225/35 front
If it was mm they would both be the same
If it was mm they would both be the same
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Sidewall height...I didn't realise that....
Something I picked up from here was how to check the age of a tyre, the series of letters and numbers after 'DOT' will have a four digit sequence relating to the week number and year of manufacture. I had a bit of a shock when I checked a tyre on my Forester runabout last year, it must have been the spare originally and was a 2004 !!
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Sidewall height...I didn't realise that....
This ratio between the tread width and sidewall height is called the Aspect Ratio. I still think it's weird that in this age of standardisation etc we have a descriptive series of numbers that contains millimetres, percentage and inches !Angelus666 wrote: ↑Sat Feb 24, 2018 11:43 am So, I didn't realise the 35 in the 255/35/19 means the side wall is 35% of the 255mm width. I just presumed it was a MM measurement to a certain point of the wall.
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Sidewall height...I didn't realise that....
I suppose it is a bit of a mish-mash when you think about it!
But when my Dad had cross-ply tyres in the 60s the width was also in inches!
Maybe because Michelin (IIRC) were the first to make radial tyres, all of a sudden width changed to millimetres and has stayed that way ever since.
But diameter has always been in inches - maybe because by then every car on the road already had wheels in inch sizes.
A couple of times in the 80s a couple of manufacturers did try metric wheel sizes (MK 2 Granada 2.8is, and Metro 1.3s) but thankfully this didn't take off - only Michelin made tyres for them, they were hard to find and seriously expensive!
But at least percentages fit with either Imperial or Metric.
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Current - Silver Grey MC, Imola Red heated Nappa & carbon trim. Aeros, H & R Coil-overs, 224s, OE Strut brace, Nav, cup-holders, DSP Hi-Fi, pdc, cruise, MFSW, no CDV! E90 330i daily
Gone - Montego Blue
Gone - Ruby Black