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Car Forum / Chevrolet / Chevrolet Camaro / February 2007Question About Tire Size.
Hope someone can help me out here. I have stock tires on stock rims and the tire size is 245x50 16. My question is, am I able to put tires that are 245x60x15 on the current rims or do I have to get diffrent size rims. Apologies if this question is a dumb one. Thanks for any helpful advice. The car is a 1996 V6 Camaro Winston The 245 is the size of the tire the 50 is the aspect ratio (height/width) and the 16 is the wheel diameter. Only 16 inch tires will fit on 16 inch wheels. To go to a 15 inch tire you need to change to a 15 inch wheel. For the most part that is seen as a downgrade on the vehicle. You would need to make sure the wheels you get are the correct offset and bolt pattern. Hope this helps WCV www.westcoastvintage.com Over 10,000 vintage car t-shirts, all makes and models. > Hope someone can help me out here. I have stock tires on stock rims and > the tire size is 245x50 16. [quoted text clipped - 5 lines] > > Winston "WCV" <WCV@*nospam**westcostvintage.com> wrote in message > Only 16 inch tires will fit on 16 inch wheels. To go to a 15 inch tire > you need to change to a 15 inch wheel. For the most part that is seen as > a downgrade on the vehicle. You would need to make sure the wheels you > get are the correct offset and bolt pattern. > > Hope this helps Not to mention that on some cars it may adversely affect handling, have more rotations per mile, thus increasing tire wear and throw off the calibration of the speedometer. A lot of people use 15" wheels on late model Camaro's and Firebirds because that's the size slicks come in. One issue that often comes up is the inside of the wheel rubs against the calipers in the back. Other than drag racing I can't think of any good reason to run 15's Gary > The 245 is the size of the tire the 50 is the aspect ratio (height/width) > and the 16 is the wheel diameter. [quoted text clipped - 19 lines] >> >> Winston >A lot of people use 15" wheels on late model Camaro's and Firebirds because >that's the size slicks come in. One issue that often comes up is the inside >of the wheel rubs against the calipers in the back. Other than drag racing >I can't think of any good reason to run 15's > > Gary Mickey Thompson makes drag slicks in 16". Brian " Other than drag racing I > can't think of any good reason to run 15's Cause they come stock on my Cutlass? >" Other than drag racing I >> can't think of any good reason to run 15's > >Cause they come stock on my Cutlass? Why don't you swap the wheels on both cars and see if they will work. Both wheels should have the same bolt pattern. ...Ron -- 68'RS Camaro 88'Formula 00'GT Mustang >>" Other than drag racing I >> [quoted text clipped - 10 lines] > 88'Formula > 00'GT Mustang As long as his "Cutlass" is RWD not FWD the bolt pattern is the same. The Offset on a 4th Gen is closer to 4WD S-10 wheels. 84 Up Corvette wheels use roughly that same offset (comparing to regular RWD wheels). Charles > As long as his "Cutlass" is RWD not FWD the bolt pattern is the same. >The Offset on a 4th Gen is closer to 4WD S-10 wheels. 84 Up Corvette >wheels use roughly that same offset (comparing to regular RWD wheels). >Charles You're right of course. Silly me, not remembering that Olds went to a front drive platform for that model. I was thinking about the 80's and prior models. Once again, your way more on the ball than I am Charles. ...Ron -- 68'RS Camaro 88'Formula 00'GT Mustang Winston, 245x50-16's diameter is 25,645669 inch (static diameter), 245x60-15's diameter is 26,5748031 inch (static diameter). This says the 15" tire is 3,62% larger than the 16". You wont have the same good acceleration and nearly surely lower milage. Check if the 15" rims fit with your brakes. PS: Because of the larger aspect ratio the dynamic diameter of the 245x60-15s will be still larger than 3,62% compared with the 16"s. For dynamic diameter of a tire you better call the manufacturer of this tire. There is no formula! If you want to know more about static / dynamic diameter let me know in this group. George > Winston, > [quoted text clipped - 4 lines] > This says the 15" tire is 3,62% larger than the 16". You wont have the same > good acceleration Yes, slightly less acceleration. >and nearly surely lower milage. Lower miles clocked. Corrected fuel mileage may be better due to less RPMs per MPH. >Check if the 15" rims fit > with your brakes. [quoted text clipped - 8 lines] > > George >>and nearly surely lower milage. > Lower miles clocked. > Corrected fuel mileage may be better due to less RPMs per MPH. George: No, I think not, because on computer optimized cars the transmission must not be "longer" than stock (they are already optimized!). I installed a 6,5% longer transmission (using larger tires) and this resulted in 15% lower mileage and bad accelleration. My V6 didnt run into the red rpm sector while driving floored in 3rd gear (where I often did reach 5500 1/min and 120mph). >>>and nearly surely lower milage. >> [quoted text clipped - 7 lines] > mileage and bad accelleration. My V6 didnt run into the red rpm sector while > driving floored in 3rd gear (where I often did reach 5500 1/min and 120mph). There is no such thing as a 6.5 longer transmission. GM has not made a CAR transmission since 1986 that comes in more then one case length per case type (ie: TH350 Short, Mid, or Long Tail shaft). Gear ratios go Numerically higher number means a lower ratio. In rear end gearing for example a 2.73 is a High ratio, a 4.10 is a Low Ratio. In automatic transmissions from 1984 all the way to 2002, V6 & V8 F-cars use the same internals in the transmissions. The exception being 1989 Turbo Trans-am's that used a TH200R4, the same transmission used in the Grand National. The 1993 Up cars with a TH4L60 or TH4L60-E use the same gear ratios as the first TH700R4's. When it comes to standard shift from 1985 to 1992 Both V6 and V8 cars used the same T-5 5 speed transmission, with the same gear ratios. In 1993 the V8 cars got a 6 speed manual, where V6 cars used a 5 speed. None of these transmissions has a computer optimized gear ratio. The only thing the ECM has to do with tire and gear ratios is on 1995 UP cars with OBDII. The ECM controls the Speedometer readings of the electronic output from the transmission. Meaning you can have your Speedometer calibrated for different size tires using a Scan tool such as a Tech II. Assuming you have a Automatic, and 3rd gear being 1:1 ratio, then your running a 23.69 inch tall or a 23.7 inch tall tire at 5500 RPM's @ 120 MPH. With a 26 inch tall tire, all other factors being the same you would be traveling 131.7 miles per hour. One thing your car probably does have, if not originally equipped with Z speed rated tires is a 118 or 125 MPH speed limiter. With that, as soon as your ECM recognizes you have reached the limit, it shuts down fuel and spark until you lose 1 to 6 MPH, then it returns to normal again until you hit limit again. You can bounce off the limit all day long and not go any faster. If you changed tire size on a limited car, and do not recalibrate the Vehicle Speed Sensor data, when the ECM thinks you are at the limited speed it will shut down fuel & spark. Charles Winston' s question was: "about tire size" What I said, was: I installed a 6.5% longer transmission (using larger tires) and this resulted in 15% lower mileage and bad accelleration on a V6. This meant: The over all transmission ratio became 6,5% longer by using larger tires. No longer case. No Turbo, No V8. No Grand National. No calibration mentioned nor any limiter, but simply 6.5% larger tire installed. Thank You for the rest of the information. George > Winston' s question was: "about tire size" > [quoted text clipped - 11 lines] > > George I would suggest you change your language a bit. You increased your total 'final drive ratio' to a higher ratio (numerically lower). In the automotive world a "longer transmission" means psychically longer. V6 cars with larger tires almost always need a rear gear ratio change to compensate for it (if going more then a few sizes up or down). Just like taking 237/70/R15's off a truck and putting 35x12.50xR15's in there place. The change in the total final drive ratio is enough that you need to change gears. Charles yes, you are right. I do not know so much. > I would suggest you change your language a bit. You increased your total > 'final drive ratio' to a higher ratio (numerically lower). In the [quoted text clipped - 6 lines] > need to change gears. > Charles > > Winston' s question was: "about tire size" > > [quoted text clipped - 15 lines] > total 'final drive ratio' to a higher ratio (numerically lower). In the > automotive world a "longer transmission" means psychically longer. You must be the only one here that didn't know what he meant. Terminology varies all over the country. What's right for you may not be for others. Dave >>>Winston' s question was: "about tire size" >>> [quoted text clipped - 20 lines] > > Dave Considering this is cross posted to 3 news groups, define "here"? What I posted is Correct for anywhere in the world. Doesn't matter were you take the books to and open them, the terminaligy doesn't change. Neither does the Math. RPM,Speed,Final Drive Ratio=will give you tire diameter. Sure the formulas are a bit different for "English" Vs "Metric", but the principals and terms don't change. The English Language is the standard language for Engineering. Charles > >>>Winston' s question was: "about tire size" > >>> [quoted text clipped - 22 lines] > > Considering this is cross posted to 3 news groups, define "here"? "Here" would be usenet. Specifically, anyone who read it but you. > What I posted is Correct for anywhere in the world. Doesn't matter were > you take the books to and open them, the terminaligy doesn't change. ~snip~ As I said, you must be the only here that didn't know what he meant. "George wrote: I installed a 6.5% longer transmission (using larger tires). ________________________________________________ I would suggest you change your language a bit. In the automotive world a "longer transmission" means psychically longer. _______________________________________________ Usually, longer transmission would mean "physically" longer, but the OP was using the "psychically" longer definition. Rodan. > "George wrote: > [quoted text clipped - 10 lines] > > Rodan. See what happens when I reply to a post before my first cup of coffee. Charles Any opinions on suitable large tires for the '87 (3rd gen) TransAm? Particularly interested in rear tires for the stock (17" I believe) rims or perhaps offset, aftermarket rims. Repositioned bumpstops? Would like to take up the gap, better traction, beefier look without scrubbing fenderwells. Brand new T-5 and 3.73 gears with posi rear. Drink |
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