New 265/50/20 Tires On My SS - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Brakes, Suspension, Wheels and Tires > Tires

Tires Tires on your TrailBlazer SS

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  #1  
Old 01-20-2012, 12:58 AM
07SS3 07SS3 is offline
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2007 Chevy TrailBlazer SS (3SS)
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New 265/50/20 Tires On My SS

I went with a set of 265/50/20 Nitto NT850+ CUV's. They are supposed to reduce rolling resistance, and give better fuel economy. So far after about 1000 miles and some good highway trips, they have performed excellently. Very quiet, and a much improved ride over the 255/50/20 Nexen Rodians that were on it when I bought it. Got 4 of them on TireBuyer.Com for $661 with mounting and balancing. They are about a half inch taller than the stock 255's, and have thrown my speedo and computer off a bit. But it does seem that I am getting about 12% better fuel economy with these tires. The SS just feels like it is rolling easier down the road. Handled great a highway speeds in the rain. Will see how they are on snow very soon.

Can the speedo and computer be recalibrated for the slightly bigger tires? Thanks for any help on this!
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  #2  
Old 01-20-2012, 01:25 AM
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SAR85 SAR85 is offline
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The computer can be programmed with the new tire information. A dealer should be able to do it, or you could send it to PCMforless.
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Old 03-25-2012, 09:43 AM
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blautens blautens is offline
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Originally Posted by 07SS3 View Post
I went with a set of 265/50/20 Nitto NT850+ CUV's. They are supposed to reduce rolling resistance, and give better fuel economy. So far after about 1000 miles and some good highway trips, they have performed excellently. Very quiet, and a much improved ride over the 255/50/20 Nexen Rodians that were on it when I bought it. Got 4 of them on TireBuyer.Com for $661 with mounting and balancing. They are about a half inch taller than the stock 255's, and have thrown my speedo and computer off a bit. But it does seem that I am getting about 12% better fuel economy with these tires. The SS just feels like it is rolling easier down the road. Handled great a highway speeds in the rain. Will see how they are on snow very soon.

Can the speedo and computer be recalibrated for the slightly bigger tires? Thanks for any help on this!
Not to be a jerk, but how did you figure you get about 12% better fuel economy if you know your speedo is now off?

I never trust the DIC, and always calculate fuel by mileage divided by gallons, but even then - if I knew my speedo was changed by tire size...that would sort of make apples to apples comparisons tough, right?
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  #4  
Old 03-25-2012, 01:14 PM
Donwkk Donwkk is offline
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Looks like you went from a 30 inch tire to a 30 1/2 inch tire - a diff of about 1 1/2 percent or 1.1666 to be more precise - this diff is too small to worry about - if you were going 100 mph on your speedo you would be actually going 101.6 mph - a ticket either way - at 65 on the speedo the actual would be 66.2 - not enough to worry about or pay good money to have re calibrated in my opinion. Cheaper to just have a fat person on board.

In the real world our tire size most likely changes more or less the same amount depending on if we are alone or have the wife, mother in law and a couple kids on board.

When calculating fuel economy just keep in mind you may travel 1.66% miles further than odo indicates - just put odo miles in calculator + 1.66% divided by gallons = actual mpg
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Old 03-28-2012, 06:06 PM
07SS3 07SS3 is offline
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You are right on the money DonW! I recently took a trip that I know always showed up on my old Dodge Durango, and also the Chevy SS when I got it, as 209.5 miles. With the new Nitto tires it came up as 206 miles on the trip Odo. So I figured that I needed to correct my odo by 1.7 % With this correction to give me actual miles traveled I went from the 17 mpg I normally got on this mainly highway trip(keeping her under 70) to 17.8 mpg. Nitto claimed these tires would give you a 10 to 15 percent increase, and I originally thought I was seeing that. But my numbers were wrong. James was right in questioning my initial questimation.

My old Nexen tires had gotten so loud I thought I had a bad axle bearing. These tires are so quiet and the SS feels like it just coasts along now, so I thought I would see a bigger improvement in mpg. Still, I'm quite happy with the improved ride, and the reduced road noise. The slight improvement in mpg is ok with me.
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Old 04-11-2012, 10:46 PM
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How about some pics? Would love to see.
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Old 09-12-2012, 06:58 PM
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Thank you for posting this information!)
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Old 09-13-2012, 09:49 AM
TBZR2008 TBZR2008 is offline
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Thank you for posting this information!)
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