Question: How big of a tire can I go? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 06-30-2019, 08:48 PM   #1 (permalink)
rkfmninja13
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How big of a tire can I go?

Hello all! Its time to replace the dry rotted tired on the 1ton '95 G30. Does anyone have any idea how big I can go? The main reason for replacement is the dry rot but I figured I can go with a larger size and drop my highway RPMs down a little.

Currently I have 225/75r16 (factory recommended size) I am looking at a set of 235/80r16s they are 1.5 inches taller in total diamater. Is there any potential downside to going with this size? I understand the speedo will be off 4-5 mph at around 60, anything besides this? 95% of the time this vehicle is on the highway.

As always any input is appreciated!

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Old 06-30-2019, 08:56 PM   #2 (permalink)
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Here are a few photos for reference.

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File Type: jpg IMG_20190630_193009.jpg (45.7 KB, 2 views)
File Type: jpg IMG_20190630_192950.jpg (81.7 KB, 2 views)
File Type: jpg IMG_20190630_193320.jpg (83.9 KB, 1 views)
File Type: jpg IMG_20190630_193407.jpg (50.4 KB, 1 views)
File Type: jpg IMG_20190630_193004.jpg (69.4 KB, 1 views)
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Old 06-30-2019, 09:14 PM   #3 (permalink)
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You might want to split the difference and go with a 245/75R16. Best bet might be to find a used 235/85R16 and mount it on a front wheel and check for clearance.
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Old 06-30-2019, 09:19 PM   #4 (permalink)
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Hey D.camilleri! Thanks for the response. I will try to look for 245/75 tire to try out. Would you recommend a hwy tire or is there a benefit to the All terrains for those rare occasions I find myself on wet grass?
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Old 07-17-2019, 07:51 AM   #5 (permalink)
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I had similar clearances on a 2010. I was able to fit 235/85R16 tires. They fit, just barely. Look at
https://tiresize.com/tiresizes/245-75R16.htm For a comparison of sizes.
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