305 millimetres = 12.007874 inches, which can be rounded up to 12 inches.
Direct Conversion Formula 305 mm*
1 in
25.4 mm
=
12.00787402 in
12.0079 inches
25.4 mm = 1 in → 305 mm × 245 mm = (305 ÷ 25.4) in × (245 ÷ 25.4) in ≈ 12.01 in × 9.65 in
305mm wides or approx 12" 305=width(mm)-55=profile size (55%of width) -r20=the rim diameter(inches)
305mm are in one foot.
About 14 inches. (13.98 inches) Direct Conversion Formula 355 mm* 1 in 25.4 mm = 13.97637795 in
10 mm = 1 cm so 305 mm = 305/10 = 30.5 cm. Simple!
(Note that these numbers are rounded off) 1 foot - 305mm - 30cm - 0.305m - 0.000189 miles - 0.333334 Yards One sixth of a fathom.
In the UK a 300mm (12" = 305mm) steel pipe with wall thickness of 6.35mm will hold 53.24 litres per metre
Super easy conversion. One cm is 10 millimeters so just multiply cm by 10: 30.5cm = 30.5 x 10 = 305mm
To convert millimeters to inches, divide the number of millimeters by 25.4.12 mm is approximately .47 inches, or about half an inch.Direct Conversion Formula12mm*1 in25.4 mm=0.4724409449in
HMS Dreadnought used the following:10 x 12" (305mm) main, 24 x 12 pounder(76mm) and 5 x 18" torpedo tubes.
Here is a quote from Article 12 section 4.1 (12.4.1) from the FIA Tecnical regulations on tyres. "Complete wheel width must lie between 305mm and 355mm when fitted to the front of the car and between 365mm and 380mm when fitted to the rear."