Offroad Trailblazers and Envoys

Anybody tried a 235 75R17

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by G Armstrong » Mon Jul 10, 2017 9:38 pm

New to this forum and have searched with no results. Has any one tried running a 235 80R17 AT tire with no lift or spacers? Looks like it just might be enough narrower than 245's to fit.
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by BC backroader » Tue Jul 11, 2017 12:30 am

Haven't heard of anyone using that size. Mine are the 245/75/R17, and have adequate clearance to ball joint bracket.
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by Diacom » Tue Jul 11, 2017 8:08 pm

iirc the 235/80r17 and the 265/70r17 are very similar in diameter. This was on a Toyo M-55 tire so may not be similar in other brands however. But you are correct in indicating it is a narrower tire. It may work, but have never tried on a Trailblazer.
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by G Armstrong » Wed Jul 12, 2017 6:15 pm

Thanks for the input. I want to pick up some ground clearance,but would rather not install lift and/or wheel spacers at this point. 235 80R17 should be around 31.8 diameter, but 0.3 inch narrower than the stock 245 width tires. Thought maybe going to the 235 width would allow a tire taller than 30.5 and still clear the upper balljoint mount and hoped I'd find someone who had tried it. Tall and skinny is not the typical route for off road tire modification, so I may just have to have one test mounted and see what happens.
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by Diacom » Wed Jul 12, 2017 9:59 pm

G Armstrong wrote:Thanks for the input. I want to pick up some ground clearance,but would rather not install lift and/or wheel spacers at this point. 235 80R17 should be around 31.8 diameter, but 0.3 inch narrower than the stock 245 width tires. Thought maybe going to the 235 width would allow a tire taller than 30.5 and still clear the upper balljoint mount and hoped I'd find someone who had tried it. Tall and skinny is not the typical route for off road tire modification, so I may just have to have one test mounted and see what happens.


I disagree there on your thoughts about Tall and Skinny not being typical. It used to be quite typical, mainly with Bias ply tires, but just about most 4X4's ran tall-skinnies. There are still many good uses for this application. If you need to get to solid ground in mud/snow, it's easier in t-s's. More PSI for ground contact as well as other bonuses.

The wider packages that we see/have now are mainly due to Radials and Marketing as well as flotation and wider contact for rocks when aired down. The look is a big factor in wider tires as well. Some people love it, others prefer the t-s's.

JD has mentioned in the past how he's been able to achieve the ground clearance he has/had by using narrower tires as well. So I'd say if they fit and clear, run em if that's what you want.
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by G Armstrong » Thu Jul 13, 2017 1:07 am

Good chance that I'll try them. Ran 33 10.50 on my Montero and the worked very well. Definitely agree on the fact that tall and skinny used to be common and can work as good or better in many conditions.
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by ElRey » Thu Jul 20, 2017 12:43 am

This is interesting...im in a similar boat. No real desire right now to do a lift and spacers but an extra inch or so of ground clearance would be awesome. Let us know if they work out.
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by G Armstrong » Fri Jul 21, 2017 1:37 pm

Unless I can find someone to test fit one, it will be awhile before I can update with results. Just bought my TB about couple months ago and tires won't really need to be replaced for 6 months to a year. I'll definitely post up when I have new information. I'm pretty well set now on either a 235 80R17 or 255 75R17 when it's time for tire replacement. Only considering the 255 75 because in my area, these are pulled off every Jeep within a month or two of purchase can be picked up in great shape for very little money. Might be enough savings there to pay for the necessary lift and spacers? 235 80's must be a uncommon size and price is a little higher than other comparable sizes.
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by GoBison » Thu Nov 05, 2020 12:31 am

I've installed the 235/80r17 with no lift and 1.5" spacers. I clearances the front fender and bumper a little.
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