Got some new tires (update on page 2 about some diff. tires) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-14-2006, 09:35 PM   #11
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Unless the compound is super sticky, I really think you'd be losing traction with the narrower tires.
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Old 12-14-2006, 09:40 PM   #12
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yea. I might just put them on blackies and test them out. I got them for free and am getting some blackies for free also. I dont know. Maybe i will warm them up and see how sticky the compound is.
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Old 12-14-2006, 09:51 PM   #13
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I just was reading this,
Changing your Tire Size:
Another way to effect your performance is to put a smaller or larger size tire on your vehicle. The stock SC (with an Automatic Transmission) is equipped with 3.27 gears and 225-60-16 tires. This tire size has a approximate tire height of 26.63 inches. Just by changing the rear tires to 225-50-16 you drop the tire height to 24.86 inches. This drops the outside diameter of the tire -1.77 inches and in effect give you a shorter gear which will give you more pulling power out of the hole. But beware, it will also give you more tire spin as well.

It is off a performance website. So with putting on these tires, it will shorten my gears. Is that true?
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Old 12-14-2006, 09:58 PM   #14
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it is TRUE that different size tires will change your effective gear ratio
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Old 12-14-2006, 10:05 PM   #15
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edit.... Shorter would bring the drive ration up or down from 3.06?
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Old 12-14-2006, 10:17 PM   #16
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nvm i am getting myself confused. I am going to wait for an expert to step in and give some ideas.
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Old 12-15-2006, 04:21 AM   #17
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Your effective FDR would be 3.24 with those tires.
Plug in the tire sizes here:
http://www.web-cars.com/math/tiresize.html
(3.06-2.8 + 3.06 = 3.24

Thats a nice bump in gearing but smaller tires are easier to spin... add to that their smaller width and there goes even more traction.

I don't think it'* even worth mounting them. I would try and sell them on ebay.
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Old 12-15-2006, 10:32 AM   #18
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That is a nice bump in gearing. As for spinning, the guy i talked to said they are very aggressive and hook up nicely. He didnt like them because they didnt handle well on cornoring or something. They are about 3/4 of an inch more narrow. But they have alot more surface area of rubber then my current tires. My tires now have alot of spaces where it is open and no rubber. I might try them and if they spin easy then i will just sell them but i would like to atleast give them a chance.
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Old 12-18-2006, 11:51 AM   #19
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do try them on a warm day at the track you will get out of the hole much better it like free gears and you don t mind heating them up a lot there free so go ahead
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Old 12-18-2006, 03:37 PM   #20
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Quote:
Originally Posted by dillcc
205 is the width and 50 is the ratio of the sidewall height to the width if I recall.
205 is the Tread width in MM, and 50 means that the sidewall heigth is 50% of the tread width..

Say a 225 60, would be 225 mm wide( tread ) and the sidewall heigth is 60% of the 225 mm

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