Scalped Posted April 29, 2015 Share Posted April 29, 2015 just got my MJ last Sat. It has low profile tires on it that I can't stand. What is the tallest factory size tire I can use to make it look like a truck again? It's a 2 wd Thx Scalped Link to comment Share on other sites More sharing options...
yxmj Posted April 29, 2015 Share Posted April 29, 2015 31" Link to comment Share on other sites More sharing options...
dasbulliwagen Posted April 29, 2015 Share Posted April 29, 2015 Yes 31x10.50R15 will fit. But for an unlifted 2wd I think P235/75R15 would be better. Link to comment Share on other sites More sharing options...
jimoshel Posted April 29, 2015 Share Posted April 29, 2015 Could you please expand on your answer? Why do you think P235's would be better? :dunno: Link to comment Share on other sites More sharing options...
Megadan Posted April 29, 2015 Share Posted April 29, 2015 Tallest factory size is 235/75-15 (roughly 29"). The real question is, what gearing does the rear axle have? Link to comment Share on other sites More sharing options...
Marine1Texas Posted April 29, 2015 Share Posted April 29, 2015 yes agreed 235/75R15 is tallest factory put out and best with out lift. When I had 31x10.50R15 they rubbed when turning tight. My truck has the metric tone package from stock and it came with 235/75R15. I have no need to raise it since it is a farm truck, however we did put on 31x10.50R15 for 2nd pair of tires after stock and they rubbed. We switched back and no rub. Link to comment Share on other sites More sharing options...
Eagle Posted April 29, 2015 Share Posted April 29, 2015 The factory never shipped XJs or MJs with 235/75-15s. The largest factory tire was 225/75-15. 235s fit, and almost always without any rubbing on either bodywork or lower control arms. 30x9.50s and 31x10.50s when mounted on factory Jeep rims will fit in the wheel openings and won't hit the flares or sheet metal when the suspension compresses, but they will rub on the lower control arms when the steering is cranked to full lock. That can be "fixed" by shimming the steering stops on the knuckles, but you lose turning radius. Or, you can replace the lower control arms with those for a WJ Grand Cherokee. They have a bend to provide tire clearance. Especially for a 2WD, the easiest, most straightforward approach is to regard 235/75-15 as the largest tire size you can run with no issues. Link to comment Share on other sites More sharing options...
Megadan Posted April 29, 2015 Share Posted April 29, 2015 The factory never shipped XJs or MJs with 235/75-15s. The largest factory tire was 225/75-15. 235s fit, and almost always without any rubbing on either bodywork or lower control arms. 30x9.50s and 31x10.50s when mounted on factory Jeep rims will fit in the wheel openings and won't hit the flares or sheet metal when the suspension compresses, but they will rub on the lower control arms when the steering is cranked to full lock. That can be "fixed" by shimming the steering stops on the knuckles, but you lose turning radius. Or, you can replace the lower control arms with those for a WJ Grand Cherokee. They have a bend to provide tire clearance. Especially for a 2WD, the easiest, most straightforward approach is to regard 235/75-15 as the largest tire size you can run with no issues. If this is true, then why is 225/75-15 and 235/75-15 listed as the 2 OE Sizes by pretty much every database when replacing tires on my 88 Pioneer? Link to comment Share on other sites More sharing options...
shelbyluvv Posted April 29, 2015 Share Posted April 29, 2015 Eagle is spot on. Just because a "website" says it will fit doesn't mean it is factory installed. Link to comment Share on other sites More sharing options...
Scalped Posted April 29, 2015 Author Share Posted April 29, 2015 Thx guys for the quick responses. Link to comment Share on other sites More sharing options...
Megadan Posted April 29, 2015 Share Posted April 29, 2015 Eagle is spot on. Just because a "website" says it will fit doesn't mean it is factory installed. I just find it strange that it gets listed as an OE size. Never said I didn't believe him. My door sticker is unintelligable, so I can't figure out a darn thing as far as factory size and pressures go. Link to comment Share on other sites More sharing options...
Marine1Texas Posted April 29, 2015 Share Posted April 29, 2015 When we got our Comanche new from dealer it had 235/75r15 on it. that was in july 1987. Now maybe factory did not install them and dealer did. I don't remember and my uncle who got it in 1987 from dealer could not remember either. On door it says p235/75r15 and psi 30 front and back. I tried to get a better pic but is very warn lol if you zoom you can see When I am on the farm in the mud I leave pressure at 20 psi front and back. When I have to drive it to town I fill the tires to 32 front and back. Remember pressure of tire and rim can hold more like tire says 35psi. however for ride is why they say 30 psi. Link to comment Share on other sites More sharing options...
Eagle Posted April 29, 2015 Share Posted April 29, 2015 If this is true, then why is 225/75-15 and 235/75-15 listed as the 2 OE Sizes by pretty much every database when replacing tires on my 88 Pioneer? I don't know whose database you're looking at. I have the factory owner's manual for the '89 MJ open in front of me. The tire sizes it lists are: P195/75R15 P205/75R15 P215/75R15 P225/75R15 P215/65R15 Link to comment Share on other sites More sharing options...
shelbyluvv Posted April 29, 2015 Share Posted April 29, 2015 That sticker says 215/75R15. There is just a wrinkle there. Link to comment Share on other sites More sharing options...
fiatslug87 Posted April 30, 2015 Share Posted April 30, 2015 And there's the sticker in the glove box. From my '89 and '90, respectively ('88 same as '89). Link to comment Share on other sites More sharing options...
Megadan Posted April 30, 2015 Share Posted April 30, 2015 If this is true, then why is 225/75-15 and 235/75-15 listed as the 2 OE Sizes by pretty much every database when replacing tires on my 88 Pioneer? I don't know whose database you're looking at. I have the factory owner's manual for the '89 MJ open in front of me. The tire sizes it lists are: P195/75R15 P205/75R15 P215/75R15 P225/75R15 P215/65R15 I believe you. Two local tire shops pull it up and then tirerack lists it. For all I know, those two shops are using the same basic database. None of them even list the 195, 205, or 215 sizes. Just the 225 and 235. It's not much of a difference to be an argument anyway. 10mm of section width with the same aspect ratio only makes it a 0.6" taller diameter tire. Not enough to really sweat over. Link to comment Share on other sites More sharing options...
Minuit Posted April 30, 2015 Share Posted April 30, 2015 My 1991 sales brochure also lists 225/75/15 as the largest stock size. Those tire shop databases have some weird errors sometimes. In response to the OP, 235/75/15 is pretty much the perfect size for a stock height truck in my opinion. Fills up the wheel wells pretty good and doesn't have any rubbing problems. Link to comment Share on other sites More sharing options...
gogmorgo Posted May 1, 2015 Share Posted May 1, 2015 My 237/75/15's rub my lower control arms, but only slightly. I attribute it to the largish side lugs. My thoughts on tire shops differing from the factory options are that it's down to availability. Very few tire manufacturers are making off-roadable tires in those sizes. I just went through this finding tires for my Lada. The smallest a/t my tire guy could find semi-locally was the Grabber AT2 in a 205/75/15. It's a coincidence it happens to be the same tire I have on my MJ. But I'm pretty sure those still came from out-of-province. The next best he could do were 215/75's, which are definitely too big for my stock Lada, which shipped with 195/75's. The 205's clear most of the slush buildup on my inner fenders as it is. On the other hand, 235/75/15 seems to be one of the most common sizes, as just about every major tire is available in that size. It makes far more sense to spec a tire that will fit with just about every possible option than to limit yourself and risk losing the sale to the next guy who isn't quite so pedantic. Link to comment Share on other sites More sharing options...
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