Join Date: Aug 2009
Location: Cali. North Bay
The wheels and tires are going to weigh more so there will be a bit of a hit to acceleration performance as well as handling/braking performance since the suspension/brakes now have to deal with the extra weight. Unsprung weight is one of the biggest detractors in the performance arena.
Then there is this word of caution from GM in regard to fitting larger wheels on vehicles models that do not have it as a "purchase option". Gonna throw it out there just for an FYI for anyone else that reads this thread...
Document ID: 2774398
#PIC5280C: Questions On Swapping Wheels From One Vehicle To Another - (Feb 20, 2012)
Subject : Questions On Swapping Wheels From One Vehicle To Another
Models : 2010 - 2012 Chevrolet Camaro
Many dealers have inquired about installing wheels and tires onto another vehicle after taking them off a vehicle that had purchased accessory wheels. The most common scenario is when a customer left their 20" wheels at the dealer after having 21" accessory wheels installed. Then the dealer wants to sell the left behind 20" wheels to a customer who has 18" wheels on their car.
It is recommended that the customer purchasing GM Accessory wheels keep their original wheels and tires; especially if they are going from 20 inch wheels to 21 inch GM Accessory wheels. Currently there is not a 21 inch winter tire available and the customer will need the 20 inch wheels to install winter tires.
GM does not recommend or authorize installing a 20 inch wheel onto a vehicle with a factory installed 18 inch wheel due to differences in the chassis components. If the vehicle model and trim level could have been ordered with the size of wheel that the customer wants installed, then a swap would be acceptable. A vehicle cannot change to staggered tire sizes (different tire sizes on each axle) if the vehicle was not ordered and built that way.
If the vehicle is not available from GM in its current model and trim level with the customer's desired wheel size, then a swap is not supported by GM and should not be attempted.
Here are a few common examples:
- If they have the LS series 18” wheel, they cannot upgrade to the 20" wheel.
- If a car has factory 19" wheels and they could have ordered the 20" wheel from the factory, then it is OK to install the 20" wheels.
- If they have the 1LT or 2LT model with the 19" wheel, they can upgrade to the 20" wheel because it is available as a factory option.
- If the car is a LS, LT or SS series vehicle, it is not recommended to install the wider ZL1 series 20" wheels.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.