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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 08-15-2010, 09:08 PM   #1
ablackburn99
 
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GEAR RATIO VS. SMALLER TIRE DIAMETER

I was looking for some new light wieght wheels and tires. TSW Nurburgring w/ Hankook Ventus V12 Evo K110

2010 Camaro 2SS LS3

Factory
(2) Front 20 x 8 + 35mm P245/45R20 = 28.7" tall.......(1)W-30.3 lbs (1)T-32 lbs = 62.3 lbs
(2) Rear 20 x 9 + 45mm P275/40R20 = 28.7" tal.............(1)W- 32 lbs (1)T-36 lbs = 68 lbs
.................................................. ...........................................All 4 sets = 260.6 lbs Total
New
(4) All 19 x 9 + 20mm P275/40R19 = 27.7" tall..........(1)W- 29 lbs (1)T-19.5 lbs = 48.5 lbs
.................................................. .............................................All 4 sets = 194 lbs Total
.................................................. ....................................Wieght savings = 66.6 lbs Total
new wheels and tires move wheels 28mm closer to fender in front
new wheels and tires move wheels 25mm closer to fender in rear
new wheels and tires are 1" smaler diameter

Anyone know if these will work, have a similar set up, or know the pros and cons. Especially with the new tires being 1" shorter. I thought this might help save wieght and help with gearing ( vs 3.73 or 4.10 ).

Also looking for a pirce if any venders sell these.

Good link for size and offset
http://www.e90post.com/forums/showthread.php?t=255743

Last edited by ablackburn99; 08-16-2010 at 03:41 PM.
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Old 08-16-2010, 02:44 AM   #2
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This will change your gear ratio and speedo but im not sure how much. This will also create MORE fender gap so it will look worse IMO. It will also give you less ground clearance which might be an issue for you too. There are alot of light weight wheel options in 20" you might look into. If there was such a size of 295/40ZR19 or 275/45ZR19 it would be around the same diameter as stock. Good luck
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Old 08-16-2010, 05:51 AM   #3
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A 1 inch reduction in tire diameter will change the overall gear ratio by 3.4% - not much.
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Old 08-16-2010, 07:10 AM   #4
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A smaller wheel/tire diameter will lower the height of the car by half of whatever the change in tire diameter is. If you go too far, you may bottom out/scrape driveway entrances, etc. You also want to be careful not to go so small that the wheels don't fit around the brakes. You'll probably have to get the speedo re-calibrated too.

I guess the pros would be lower unsprung weight, lower rotational inertia. However, you can accomplish this with aftermarket 20" wheels.

If you are looking for better gearing, I'd just put in different gears. Probably less that can go wrong, since the ride height, handling, steering, alignment, and other characteristics of the car would be optimized by GM's engineers for the wheel/tire size that come on the car. Besides, gears would have more of an effect (going to 19s would only be the equivalent of going to a 3.63 gear).
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Old 08-16-2010, 03:28 PM   #5
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Added some wieght figures to original post.

Total wheel and tire Wieght savings = 66.6 lbs not to bad!!!
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Old 10-11-2013, 11:18 AM   #6
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Quote:
Originally Posted by ablackburn99 View Post
Added some wieght figures to original post.

Total wheel and tire Wieght savings = 66.6 lbs not to bad!!!
It's OK, but it's sprung weight savings. Unsprung weight savings is where things get FUN!
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Old 10-11-2013, 02:50 PM   #7
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Quote:
Originally Posted by Snidely Whiplash View Post
It's OK, but it's sprung weight savings. Unsprung weight savings is where things get FUN!
Rotational mass reduction has its own advantages. That kind of savings will be felt for sure.
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Old 10-12-2013, 02:46 AM   #8
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Your weight for the 19" tire is wrong, unless you magically think there is only 1/2 to 2/3 the rubber of the 20" tire present. They weigh 31.03 pounds a piece
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Old 10-12-2013, 07:19 AM   #9
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Wheels and tires are unsparing weight.
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Old 10-12-2013, 01:54 PM   #10
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Quote:
Originally Posted by Snidely Whiplash View Post
It's OK, but it's sprung weight savings. Unsprung weight savings is where things get FUN!
Rhino is correct. Unsprung weight means weight that is not supported by the springs, such as wheels, tires, brakes, hubs, lower control arms, etc.

Rotational mass refers to items that get, uh, rotated, when the car is in motion.

Reducing both pays substantial dividends.

If you want "fun with numbers," just take the new overall diameter and divide it by the old diameter. That number tells you the percentage of the original diameter, and in this case, it will naturally be a smaller number than 1.0. It's also a useful number to compare speedometer readings, as you can multiply that result against your speedo reading to get a true readout at any speed (provided the speedo was correct in the first place).

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Old 10-12-2013, 02:57 PM   #11
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Is a helmet delete considered rotational mass?? Bc I'm usually rotating around to look to see how far I'm in front on a Mustang while I'm going down the
track?
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