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Snow tires and wheels


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54 replies to this topic

#41 OFFLINE   ptjones

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Posted 10 October 2013 - 04:39 PM

Paul,

That's a tiny change...  but it got me thinking about how much tire pressure and wear affect revolutions/mile, and so speedo/odo cal.

 

Wear

Per Tire Rack, Michelin makes the OEM tires with 9.5/32" of tread depth.

- I'll calculate using unloaded dimensions; there's a consistent 3% difference between loaded and unloaded radius

- Assuming a 3/32" threshold for "worn out," one expects a 6.5/32" change in radius over life, or a 13/32 change in diameter, 0.406"

 

The result is a 1.6% change in static diameter over life.

 

Pressure

Michelin rates the OEM tire at 1433 lb.@51psi. Tread width is fixed at 8.2". Contact patch length will vary with pressure.

- from Pascal's Law

Force = pressure x area, so contact patch area = force / pressure, or 1433 / 51=28.8 sq. in.

- assuming square corners (a bad assumption), contact patch length = area / tread width

- the hard part is calculating the radius change due to a "flat spot" the length of the contact patch

(Warning, trigonometry)

Loaded R = static R x (1 - cos(x)),

where x = asin(contact patch length / static diameter)

 

The result is a 0.3% change in rolling diameter going from 51psi to 38psi., up to 0.6% if you go down to 30psi.

 

Have fun,

Frank

I have raised my tire psi from 45 to 50 and plan to move front to back  the tires, Rears have more tread and will see what effect that has on GPS mileage. The difference was 1.38% on my record breaking trip. I'm thinking it might go to 1.5%.  

Paul









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#42 OFFLINE   jdbob

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Posted 22 October 2013 - 06:36 PM

Looking at snows for a hybrid means you're interested in rolling resistance as well as winter performance. Recognizing that, Tire Rack included mpg in their most recent snow tire test. It lead me to buy Michelin X-Ice as the best combination of ice and dry road performance with the lowest RR.

 

Tire Rack has a very niced web site for price comparisons. I won't discuss prices here, except to say that X-Ice will cost you $34 extra per tire for stock 225/50's compared with 215/55's. Per my discussion above, I'd recommend the 215 on performance grounds as well. Rev per mile is 803 stock vs 791 for the 215/55's, about 1.5%.

 

Have fun,

Frank

 

I just received my 215/60R-16 Michelin X-Ice tires today from tirerack. Picked up a cheap scissor jack to install one temporarily to make sure everything fit. Ordered a hydraulic jack that will go low enough to get under the C-Max low-rider, the one I use on the F-150 only goes down to 7.5". Hopefully the 60 degree clear weather will continue, winter tends to start in November.



#43 OFFLINE   Phil1336

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Posted 23 October 2013 - 11:25 AM

Since relocating to South Florida from Massachusetts in 1998, the only reminder I have of Winters past is the Ice Scraper I kept as a souvenir.  Can`t say I miss De-Icers, Dry Gas, Studded Snow Tires, Engine Core Block Heaters, and the other joys of Old Man Winter.  Have to admit though, three things that come to mind that we do miss here in the Tropics.  Runny Noses, Chap Lips, and Wool Rash, oh well...... 


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#44 OFFLINE   JAZ

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Posted 28 October 2013 - 02:43 PM

I vote to ban Phil1336...jk


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#45 OFFLINE   fbov

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Posted 28 October 2013 - 03:14 PM

Why? We still have the better deal - at least snow melts...



#46 OFFLINE   Joh L

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Posted 28 October 2013 - 10:12 PM

Ran 16" R60 16's studded last winter--good results. The 17's vacation in the garage.

Bought the rims from ford dealer. Run about 1% slow according to GPS.

Location upstate hilly New York



#47 OFFLINE   obob

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Posted 06 October 2014 - 11:44 AM

I was curious about this as well, but after glancing at the Focus ST forums they are able to clear 16" wheels on their cars. I assume that the C-Max and ST probably have similar sized front calipers so I bought a used set of 16" 5x108 wheels that I'm going to use for winter.

You can use any of the widely available tire size calculators to make sure your new set of tires match the size of the OEM spec:
http://www.kouki.co....size-calculator

I'm going with 215/60R16 which are pretty close at 1.2% faster than stock.

 

225 50 17  25.858 
225 50 16  24.858 
 
215 55 16  25.311
215 55 15  24.311
215 55 17  26.311
 
205 60 15  24.685
205 60 16  25.685
205 60 17  26.685
 
Here are some diameter I got from a diameter calculator.   


#48 OFFLINE   kevbot13

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Posted 08 November 2015 - 05:25 PM

Reviving this thread...I just checked Tirerack's Winter tire "preferred package"for the 2013 C-Max SEL and they were 215/65/15 size tires. Using the kouki.co.uk link, that was only a 0.6% in speed than the stock wheels.

 

Doesn't look like anyone here considered the 15" wheels, they're certainly cheaper. Now I'm just wondering whether they will clear the brakes.



#49 OFFLINE   fbov

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Posted 09 November 2015 - 01:18 PM

The size they sell will depend on the brand they want you buy.

 

Take a look at Tire Rack's  "build your own" packages. They only offer 3 brands in a 15" size, indicating the 215/65-15 is not a very common size. The 16" packages have 19 tire options, and the 17's, 25 options. With tires, unless you want a specific tire that's only a good match in a 15, you're better off having a bunch of choices.

 

I went with 215/60-16s on Ford steel wheels... and paid far more than you would! Tire prices are down!!

 

I also went with X-Ice 3, and can make a good argument that Michelin got the rolling resistance right with these snows.

 

HAve fun,

Frank



#50 OFFLINE   WNY

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Posted 17 November 2015 - 05:16 PM

Would the 15" rims clear the calipers? might depend on how the rim is made. 

I Just got my Michelin Xice 3 snow tires today from TireRack. Went with 215/55/R17 which were almost $30/ea cheaper than the stock size of 225/50/R17. They were least expensive and in stock.  only about 3/8" difference in size.  

 

I Will get them mounted this weekend, hopefully.

 

I'll run the snows on the stock rims and put the stock tires on New rims for the summer .


Edited by WNY, 25 November 2015 - 05:53 PM.


#51 OFFLINE   WNY

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Posted 25 November 2015 - 05:54 PM

These should give me some good winter traction. Michelin Xice x3

215/55/R17 on the stock rims. Ordered thru TireRack.

 

Winter Tires Michelin XIce X3

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#52 OFFLINE   Taiwwa

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Posted 23 December 2015 - 04:43 PM

So the year is 2015 and I am wondering what is a good spare wheel to get? For my C-max. 



#53 OFFLINE   tr7driver

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Posted 24 December 2015 - 09:41 AM

I'm starting to look for rims on ebay and Craigslist.  What year/size focus wheels fit the c-max?



#54 OFFLINE   WNY

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Posted 24 December 2015 - 10:06 AM

I believe as long as the rims are 5 x 108mm bolt spacing, they should fit. the Ford Focus, Fusion, some older Taurus, and probably others. 
Tire Rack has the basic black steel wheels also. 



#55 OFFLINE   obob

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Posted 24 December 2015 - 10:34 AM

So the year is 2015 and I am wondering what is a good spare wheel to get? For my C-max. 

 

http://fordcmaxhybri...r-c-max-hybrid/








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