Buying new tyres?
- If you live in Australia, spend $10 or go to a library and get the Choice test for tyres that your car uses (or something close).
- Look at the recommended tyres and decide what features you want more than others.
I need 205/65R15, 215/60R15, or 225/60R15 tyres. I have 7" wide rims (15x7J) so I can use 8" to 9" tyres (205 - 225 and maybe 235).
You can change widths and profiles if your rims are the right width and you consider speedo errors.
For example a 205/65R15 has the same circumference as these:
- 215/60R15 (1.3% error),
- 225/60R15 (0.5% error), and
- 235/55R15 (1.2% error).
Here is my Math.
Circumference = pi * ( rim_size * 25.4 + 2 * ( profile / 100 ) * width )
A worked example might help.
For 225/60R15, C = pi * (15*25.4 + 2*60/100*225) = 2045mm
What to look for.
- Tread Wear 300+ (3 time 'standard' tyre life)
- Traction (braking in the wet) AA or A
- Temperature A
The tyre manufacture date is also on tyres. It seems to be stamped in rather than the other text which is raised. Look for something like 2309 - meaning 23rd week in 2009.
Here are photos of the Treadwear, Traction, Temperature, tyre size and date from one of my old tyres.
Tread width 225mm
Profile 60% (of 225mm)
Tyre Radial (R)
96V load and speed rating
Manufactured in the 49th week of 2007