Tell me I didn't just mess up

[Maximus JT]

Good afternoon all. I have a 21 JT Sport S with the 4.10's. I am about to install a 2.5" Lift and 37" Tires on 17x8.5 -6mm wheels. Did I just mess up and should have went with 35's?

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[jay21mojave]

Good afternoon all. I have a 21 JT Sport S with the 4.10's. I am about to install a 2.5" Lift and 37" Tires on 17x8.5 -6mm wheels. Did I just mess up and should have went with 35's?

What is the BACK SPACE In inches.. I believe the -6mm is OFFSET which is different than Back space. Also.. you should check the tire brand web site for specs on wheel width for the tires you are installing; many chain tire stores will not mount if outside the tire mfg spec requirements.
You might find it very sluggish with 4.10s and 37s.. https://www.tireoutlet.com/blog/294...g vs. Wheel Offset Chart , 0 8 more rows

 

[kevman65]

You're going up 2 1/2" and wheels are going out almost 2". If you still have stock bumper the only thing I can see to worry about are the gull wings on top of your foglight closeout panels.

At full stuff, you may or may not rub on the fender liner or flares. It seems to differ between lifts.

 

[bleda2002]

You'll be fine. Its gonna be slower for sure but the 4.10's roll the 37's ok. I'm on 0 offset with 37's and 410's and still get 14.5 mixed with a lead foot.

Also for the guy asking, the backspace is 4.5.Take the size of the rim (8.5) then divide by 2 and add .5 (4.75), then add the offset. So 4.75 + -.25" (-6mm converted) gives you the 4.5.

Other examples 8 inch 0 offset is 4.5" backspace, 8.5 at 0 offset is 4.75, 9 at 0 is 5, 9.5 at 0 off set is 5.25 etc.

 

[Maximus JT]

What is the BACK SPACE In inches.. I believe the -6mm is OFFSET which is different than Back space. Also.. you should check the tire brand web site for specs on wheel width for the tires you are installing; many chain tire stores will not mount if outside the tire mfg spec requirements.
You might find it very sluggish with 4.10s and 37s.. https://www.tireoutlet.com/blog/2942/wheel-offset-and-backspacing-explained/#:~:text=Backspacing vs. Wheel Offset Chart , 0 8 more rows

Backspacing is 4.5". Tires are Mickey Thompson Baja Boss 37x12.50's

 

[tbaker]

I am running 37 inch milestar Patagonia tires with a 2.5 inch lift on a gladiator rubicon with 4:10 gears and it’s fine it will move right on down the road no problems and it rides great I recalibrated my speedometer and the shift points with the Rough Country recalibration meter

 

[Levi.Butler]

Agreed with everyone above. I'm on a 2" lift and 37x12.50s on 17x9 -38 (3.5" backspacing) and I'm good to go. I think it MIGHT rub on the end pieces of the front bumper if they were still installed but didn't have any issues with my Rubicon fenders and definitely don't have issues now that I've chopped them. You should be just fine with your sport fenders!

Have fun!

 

[Maximus JT]

Thanks all for the replies! Makes me feel better about the decision to go 37's with the lift and keeping the stock gears for now. I will likely re-gear to 4.88 down the road, but just had the funds to do lift, wheels and tires first. I am also looking at the 12+8 Pin Cable and Bluetooth OBD II plug so I can re-cal with the JSCAN app.

 

[Levi.Butler]

Thanks all for the replies! Makes me feel better about the decision to go 37's with the lift and keeping the stock gears for now. I will likely re-gear to 4.88 down the road, but just had the funds to do lift, wheels and tires first. I am also looking at the 12+8 Pin Cable and Bluetooth OBD II plug so I can re-cal with the JSCAN app.

Oh yeah, that too. Meant to comment before.

The 4.10s aren't perfect... but they are just fine. I will also re-gear later on down the road as well, but with this new 8 speed, the 4.10s push 37s just fine.

 

[DocMike]

In Alabama you should be fine. I'm running 35s with 3.73 and just Rubicon take offs (plus a terrflex 1.5 level). I only rub on the tops of the fenders at full flex. I am going to a 4.88 as I am dealing with a lot less air up here. I'd think clearance wise you are good. Only you can determine if you like the gearing. This chart is useful.

https://www.quadratec.com/c/reference/best-gear-ratio-when-adding-larger-tires

Thanks all for the replies! Makes me feel better about the decision to go 37's with the lift and keeping the stock gears for now. I will likely re-gear to 4.88 down the road, but just had the funds to do lift, wheels and tires first. I am also looking at the 12+8 Pin Cable and Bluetooth OBD II plug so I can re-cal with the JSCAN app.

 

[mdhaman]

You'll be fine. Its gonna be slower for sure but the 4.10's roll the 37's ok. I'm on 0 offset with 37's and 410's and still get 14.5 mixed with a lead foot.

Also for the guy asking, the backspace is 4.5.Take the size of the rim (8.5) then divide by 2 (4.75) and then add the offset. So 4.75 + -.25" (-6mm converted) gives you the 4.5.

Same here. I didn't notice much sluggishness at all though coming off 35s.

 

[AZCooWhip]

Just do the 4:88s and look in your rear view mirror. Angst eliminated.

 

[Readyt]

What is the BACK SPACE In inches.. I believe the -6mm is OFFSET which is different than Back space. Also.. you should check the tire brand web site for specs on wheel width for the tires you are installing; many chain tire stores will not mount if outside the tire mfg spec requirements.
You might find it very sluggish with 4.10s and 37s.. https://www.tireoutlet.com/blog/2942/wheel-offset-and-backspacing-explained/#:~:text=Backspacing vs. Wheel Offset Chart , 0 8 more rows

Since the Original Offset was +40, they will stick out a bit. 37's on 17" wheels are typically over 100 lbs. each. Went with 35's on 17" wheels on my Overland. Wheel and Tire weight went went from 65 lbs. to 97 lbs. and my mileage went from 20 Avg. to 14. But I still love my truck. If you like the look, drive it and enjoy it.

 

[DocMike]

I will be angst free Thursday afternoon. I feel like a responsible Jeep owner. I coulda bought cool stuff to make my Jeep look cooler, but I went with 4.88. That counts as responsible right?

Just do the 4:88s and look in your rear view mirror. Angst eliminated.

 

[AZCooWhip]

I will be angst free Thursday afternoon. I feel like a responsible Jeep owner. I coulda bought cool stuff to make my Jeep look cooler, but I went with 4.88. That counts as responsible right?

Damn skippy it does. ??

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