2007 Tahoe 20" Wheels
Looking for advice on after market 20" wheels and ties. Dealer wants $3000.00 for Chevy brand.
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Also, did they have to change the tire monitor or did they use the original?
Hey Tenberge, how about setting up your CarSpace page and posting some pics of your wheels?
if both then you need to have the speedometer recalibrated
The alternative of reprogramming the tire diameter into the vehicles computer requires a programmer, like Hypertech. Not a cheap solution, so its easier to match sizes.
Regarding the maximum wheel sizes, the dealer saying that 17' are the max is wrong. I had 20's on my '01 and '05 Yukons. Any aftermarket wheel with 15 to 25mm positive off-set works fine. Width would be 8.5 to 10". The rubber would be best at 285x55x20 (for 8.5-9" wheels) to 305x50x20 for 9.5-10" wheels).
Hint: The larger off-set of 20+ would be recommended for the 305 tires, to avoid an hard turn rub.
The 285x55x20 is the factory tire size (optional 20's) for the pre-07 Denali's and Escalades.
The problem with the '07 factory wheels (20's and 22's) is that the off-set is 31mm, which is a little TOO much for '01-06' SUV's.
Finally, the weight is a concern. The '01-06' brakes are certainaly better than the previous generation, but excessive weight has 2 effects.
1. The braking distance is increased due to weight.
2. The ride gets harsher and bouncier because of the extra weight being pushed on the springs and shocks.
If you have the bucks, look for forged wheels, rather than cast. They are very light-weight, stronger than cast, but expensive.
I bought 20" EVO Weld Wheels back in 2001, and the tire/wheel combo was lighter than stock. I got these after previously purchasing a cheaper set, that nearing knocked my teeth out, and made the steering a bit squirrely (seeking ruts in the road). Perhaps look for wheels that have less mass, like spoke styels. Check out the EVO AXIS-6 wheels. They are being discontinued, but the spoke style is illustrated well.
Here's a good comparo for sizing:
From past experience with Avalanche's, 305's MIGHT rub a tad in full turn and/or compression, but I'm not completely sure. Should be fine, but you might also get more substantial data from either a wheel/tire shop or other online boards.
The dealer told me I would need the trans Recalibrated,
and the sensors re learned. well I did the sensors myself, no big deal.
but I was also made aware by the guy I bought the set from that, the 17's and 20's measure the same when on the vehicle, about 31" from top to bottom.
so I don't need no stinking trans recali.
the wheel is larger but the tire shorter which in turn, ends up being the same height as the 17s that was on there.
the dealer wanted an extra 220 for this recalibration job
just to be on the safe side, I tested the deal against the mile markers on a nearby Road and all's cool plus the tahoe looks awesome with the brushed 20's on
first number is width in mm, to convert to inches, divide by 25.4.
second number is sidewall ratio (to the width) ie 55 = 55% of the width
third number is wheel diameter.
so to calc tire size for - say a 305/50/20 you would say
305mm / 25.4 = 12" wide x .50 x 2 (two sides to a tire) plus 20 (wheel diameter) = 32" diameter tires
now you can run 15" wheels with 35" tires if you have a high sidewall ratio (lots of rubber vs lots of wheel), see the difference?
my 07 silverado crew cab just got a 2" leveling kit, i tried 305/55/20's and they rubbed when i turned, so i cant go quite that big, either have to go down to 285 wide, or to 50 sidewall.
It seems that if I were to get a 20" rim with a lower profile tire that the overall diameter would be the same. I just do not want any issues with ABS or to void any warranties. Any suggestions would be appreciated.