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its really funny you say that jack230 because i just got the same sponge from the auto store after i complained that the black magic gel was slinging all over the sides of my car... i got it wondering how the hell is this supposed to be better than the square sponge in the box but as long as you use it and run it acroos the tire a bunch of times to get rid of excess it shouldnt sling off. and the shine of black magic is way way bettr than meguiars, unless you like the satiny finish. i like the smell too yummy lol :p i found that a lot of meguiars chemicals have a good smell to them, check out the gold class interior wipes, another outstanding product...
CP
P.S. Is there some "wiggle room", like 235 or 245 are fine on a 225, but 255 would not work?
Current tire size is 225/45/R17, so
225 * 0.45 = 101.25 mm is the sidewall height,
so the closest sidewall to 101.25mm with the wider tire would be:
255 * 0.40 = 102.00 mm,
ie, 255/40/R17
However a 255mm wide tire is apparently too wide for the 7.5" (190.5mm) 17" rim. Please correct me if I'm wrong.
The worst example I can think of right now was when a friend of mine got 175/45 13 Pirelli P7s 20 years ago for a Renault 5 - the nominal width was 175 mm, but measured with a ruler, it was more like 195 mm. So even if the 45 aspect ratio was correct, the actual sidewall height would have been wrong, if the calculation had been based on the nominal 175 width.
This trend is still true today, so be advised to get the tire manufacturers' own official figures for width/diameter etc. before committing to anything other than stock "pneumatiques".
If you want more grip, you might try a better tire - I have found that by switching tires with the same size - 245/17, I get a lot more grip - I went from Pirelli PZero Rossos to Bridgestone S-03 Pole Positions and the difference in grip was tremendous and it was also a bit quieter.
Theoretical calculations of tire diameter/circumference are just that - theoretical. The manufacturers themselves actually publish the REAL diameter/circumference figures (check with a tire store) and you would be shocked how inaccurate some of the theoretical calculations can be!
Otherwise the computer has to be updated, so the speedo and odometer work properly.
Maybe you're right and pure math does not apply here in that case the car computer would always have to be updated with the correct tire size.
The Best of Mercedes & AMG
Does that sound reasonable to you guys? I do not want to risk my life by not spending a couple hundred bucks if necessary. Then again, I do not want to throw away money if it is not necessary.
Any help is appreciated.
CP
P.S. If the image does not load, click the link below.
http://home.indy.rr.com/chrono/tire.jpg
The best way to find out is to get your dealer/garage/tire shop to take the wheel off the car and spin balance it and determine if it's bent.
With all that said, the damage doesn't look that bad so don't stress too much ;-)
If you need to get your rims fixed, check these guys out they do really good work:
http://www.wheelcollision.com/index.html
My gut feeling is that there is no real damage. I do not notice any pull whatsoever. Of course, I never noticed any from the beginning.
The scratch on the rim is extremely superficial and the lost chunk of tire looks like it is on the superficial potion of the sidewall where they put a raised region.
So, all in all, I think I am OK. Anybody else want to sooth my fears away?
CP
I used to work in a tire plant for about 6 years, and when there was an abnormality in the tire we would "dig" the sidewall....basically gouge a chunk out.....and then stuff it with green rubber and spot cure that area. You would be suprised how deep you can dig before you hit steel. The area you have damaged your tire is close to the bead area, which is considerably thicker and harder than the rest of the sidewall.
Watch those potholes!!!
Michelle
Thanks for all you help,
CP
is it true? what should I do cause I really don't want to go thru the hazzle of changing tires every now and then.
thanx.
Geo
I'll probably be replacing the Michelins with Kumhos when the time comes to save some $$.
You can't use wear ratings to compare tires across brands. Each tire manufacturer selects one of its own tires as as the base line from which all its other tires are rated. There is no gorvernmental tread wear standard, so it is almost imposssible to compare tread wear between manufacturers.


