Tire Sizes, I don't get it!
#1
Tire Sizes, I don't get it!
So I found this infomation online and have a question:
+-----------+-------------------+
| TIRE SIZE | DIAMETER |
+-----------+-------------------+
| 195/55-15 | 23.44in (595.5mm) |
| 205/40-17 | 23.46in (595.8mm) |
| 215/50-15 | 23.46in (596.0mm) |
| 215/45-16 | 23.62in (599.9mm) |
| 195/50-16 | 23.68in (601.4mm) |
| 185/60-15 | 23.74in (603.0mm) |
| 215/40-17 | 23.77in (603.8mm) |
| 205/55-15 | 23.88in (606.5mm) |
| 215/35-18 | 23.93in (607.7mm) |
| 175/65-15 | 23.96in (608.5mm) |
| 225/45-16 | 23.97in (608.9mm) |
| 205/50-16 | 24.07in (611.4mm) |
| 225/40-17 | 24.09in (611.8mm) |
| 225/35-18 | 24.20in (614.7mm) |
| 195/60-15 | 24.21in (615.0mm) |
| 205/45-17 | 24.26in (616.3mm) |
| 215/55-15 | 24.31in (617.5mm) |
| 195/55-16 | 24.44in (620.9mm) |
| 215/50-16 | 24.46in (621.4mm) |
| 185/65-15 | 24.47in (621.5mm) |
| 215/45-17 | 24.62in (625.3mm) |
+-----------+-------------------+
Why is it that tires that have the same wheel radius and sidewall measurement but different widths end up deing different diameter?
+-----------+-------------------+
| TIRE SIZE | DIAMETER |
+-----------+-------------------+
| 195/55-15 | 23.44in (595.5mm) |
| 205/40-17 | 23.46in (595.8mm) |
| 215/50-15 | 23.46in (596.0mm) |
| 215/45-16 | 23.62in (599.9mm) |
| 195/50-16 | 23.68in (601.4mm) |
| 185/60-15 | 23.74in (603.0mm) |
| 215/40-17 | 23.77in (603.8mm) |
| 205/55-15 | 23.88in (606.5mm) |
| 215/35-18 | 23.93in (607.7mm) |
| 175/65-15 | 23.96in (608.5mm) |
| 225/45-16 | 23.97in (608.9mm) |
| 205/50-16 | 24.07in (611.4mm) |
| 225/40-17 | 24.09in (611.8mm) |
| 225/35-18 | 24.20in (614.7mm) |
| 195/60-15 | 24.21in (615.0mm) |
| 205/45-17 | 24.26in (616.3mm) |
| 215/55-15 | 24.31in (617.5mm) |
| 195/55-16 | 24.44in (620.9mm) |
| 215/50-16 | 24.46in (621.4mm) |
| 185/65-15 | 24.47in (621.5mm) |
| 215/45-17 | 24.62in (625.3mm) |
+-----------+-------------------+
Why is it that tires that have the same wheel radius and sidewall measurement but different widths end up deing different diameter?
#2
Here's an example
205/55 R15
205 = width in mm
55 = height of one sidewall expressed as a % of the width.
15 = diameter of wheel in inches
Diameter = 15 inches + 2 * 55% * 205mm / 25.4mm per inch = 23.88 inches
Last edited by dave; 09-20-2006 at 10:29 AM.
#5
#6
So I found this infomation online and have a question:
+-----------+-------------------+
| TIRE SIZE | DIAMETER |
+-----------+-------------------+
| 195/55-15 | 23.44in (595.5mm) |
| 205/40-17 | 23.46in (595.8mm) |
| 215/50-15 | 23.46in (596.0mm) |
| 215/45-16 | 23.62in (599.9mm) |
| 195/50-16 | 23.68in (601.4mm) |
| 185/60-15 | 23.74in (603.0mm) |
| 215/40-17 | 23.77in (603.8mm) |
| 205/55-15 | 23.88in (606.5mm) |
| 215/35-18 | 23.93in (607.7mm) |
| 175/65-15 | 23.96in (608.5mm) |
| 225/45-16 | 23.97in (608.9mm) |
| 205/50-16 | 24.07in (611.4mm) |
| 225/40-17 | 24.09in (611.8mm) |
| 225/35-18 | 24.20in (614.7mm) |
| 195/60-15 | 24.21in (615.0mm) |
| 205/45-17 | 24.26in (616.3mm) |
| 215/55-15 | 24.31in (617.5mm) |
| 195/55-16 | 24.44in (620.9mm) |
| 215/50-16 | 24.46in (621.4mm) |
| 185/65-15 | 24.47in (621.5mm) |
| 215/45-17 | 24.62in (625.3mm) |
+-----------+-------------------+
Why is it that tires that have the same wheel radius and sidewall measurement but different widths end up deing different diameter?
+-----------+-------------------+
| TIRE SIZE | DIAMETER |
+-----------+-------------------+
| 195/55-15 | 23.44in (595.5mm) |
| 205/40-17 | 23.46in (595.8mm) |
| 215/50-15 | 23.46in (596.0mm) |
| 215/45-16 | 23.62in (599.9mm) |
| 195/50-16 | 23.68in (601.4mm) |
| 185/60-15 | 23.74in (603.0mm) |
| 215/40-17 | 23.77in (603.8mm) |
| 205/55-15 | 23.88in (606.5mm) |
| 215/35-18 | 23.93in (607.7mm) |
| 175/65-15 | 23.96in (608.5mm) |
| 225/45-16 | 23.97in (608.9mm) |
| 205/50-16 | 24.07in (611.4mm) |
| 225/40-17 | 24.09in (611.8mm) |
| 225/35-18 | 24.20in (614.7mm) |
| 195/60-15 | 24.21in (615.0mm) |
| 205/45-17 | 24.26in (616.3mm) |
| 215/55-15 | 24.31in (617.5mm) |
| 195/55-16 | 24.44in (620.9mm) |
| 215/50-16 | 24.46in (621.4mm) |
| 185/65-15 | 24.47in (621.5mm) |
| 215/45-17 | 24.62in (625.3mm) |
+-----------+-------------------+
Why is it that tires that have the same wheel radius and sidewall measurement but different widths end up deing different diameter?
The variation also helps to give us a variety of tires to choose from that will fit the MINI for different purposes as long as the outer tire diameter is close to the stock size. For most MINIs the stock tire is about 24.4" and we can increase or decrease the outer tire diameter by about 0.5" without creating problems.
Next you look at the width of the tire you want to consider along with the sidewall height ratio. 40 or 45 series tires for performance and 55 or 60 series tires more for comfort and street use with some performance.
Tire companies cannot make all sizes possible and will have to pick and choose what tire sizes would sell for the masses. For some of the tire sizes in your chart very few to no tires exist:
225/40-17
215/55-15
#7
So another question, I just got my brand new S, been wanting one for 3 years and finally got it.
I wanted to get snow chains for it but the manual seems to say that only these tire sizes are allowed for snow chains:
175/65 R15
175/60 R16
Can I put 175/60/R16 tires on my stock R16 R84 Cooper S wheels?
They have 195/55/R16 right now.
Or is this guideline a bit shakey and I can put chains on anyway?
I wanted to get snow chains for it but the manual seems to say that only these tire sizes are allowed for snow chains:
175/65 R15
175/60 R16
Can I put 175/60/R16 tires on my stock R16 R84 Cooper S wheels?
They have 195/55/R16 right now.
Or is this guideline a bit shakey and I can put chains on anyway?
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#9
You should give Alex@tirerack.com a call and ask about sizes of snow tires to use for your MCS and about the chains. Let us know what you find out.
#10
#11
Spikes Spider
Hiya folks, this is my first post here and I decided to make it a meaningful one. I just ordered my Mini, it wont be here until dec 1st and I can hardly wait!
Myself, I ski and snowboard here in Oregon and I needed to be able to put snow chains on to get up the big hill to the snow parks but when I started searching for chains I found this forum and this thread! YIKES! It freaked me out!
BUT!
I called my dealer and they recommended these guys here
http://www.spikes-spiders.com/
They are called spikes spider and they are made to work just like, actually better than, snow chains with one big difference!
They are made to work with sports cars and other cars like our mini cooper that have no where near enough clearance between the tire and the wheel well wall surface.
They only clip on over the outside of the tire and the tread part covers just the top of the wheel. Nothing on the inside of the tires edge! Too cool!
At $279 for the set they arent cheap, but for those of us that do not like to ride around on snow tires and just need to chain up when the occassion calls for it, these are perfect!
My dealer also told me that the use of these guys will not effect my warranty so I am going to give them a run. I will probubly order then before I even get my mini so I am ready for the ski season. Best of luck and hope this helps! Jeff
Im off to post in the newbie thread now!
Myself, I ski and snowboard here in Oregon and I needed to be able to put snow chains on to get up the big hill to the snow parks but when I started searching for chains I found this forum and this thread! YIKES! It freaked me out!
BUT!
I called my dealer and they recommended these guys here
http://www.spikes-spiders.com/
They are called spikes spider and they are made to work just like, actually better than, snow chains with one big difference!
They are made to work with sports cars and other cars like our mini cooper that have no where near enough clearance between the tire and the wheel well wall surface.
They only clip on over the outside of the tire and the tread part covers just the top of the wheel. Nothing on the inside of the tires edge! Too cool!
At $279 for the set they arent cheap, but for those of us that do not like to ride around on snow tires and just need to chain up when the occassion calls for it, these are perfect!
My dealer also told me that the use of these guys will not effect my warranty so I am going to give them a run. I will probubly order then before I even get my mini so I am ready for the ski season. Best of luck and hope this helps! Jeff
Im off to post in the newbie thread now!
#12
#14
From experience running them in the mountains around big bear etc. I know that spider spikes do meet the requirements for chains and or snow tires. I have a history of using them on a saturn SL1. they are for short term use. Just to get you through the snow. absolutley not for pavement or speeds above 30 mph.
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