Learned a lesson the HARD WAY regarding backspacing - Page 2 - JeepForum.com
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post #16 of 30 Old 03-31-2011, 08:13 AM
Woodenya
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What happened Boogie?....


'06 TJ Rubi (Light Metalic Khaki) 6sp, Bought 3-10 w/6500 miles. 31 MTR's, UCF alum UHC T-case & engine skid w/ LoPro, Rokmen gas tank & steer gear skid, Ridler dif covers F/R, Warn 8274-50, Optima Yellow top, Pro Comp front 3/4" spacers, Currie 1" BL, Bomb Proof MML, Novak cable shifter, AGR Super Box 2, Warn rear bumper/tire carrier, Rubi locker mod/pumps moved to engine bay, OBA. Build to come...
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post #17 of 30 Old 03-31-2011, 08:24 AM
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Why not just trim the upper coil perch off with a grinder? Ive done this on the last 3 TJs ive owned. I also ran 33x12.50 on stock ravines with no issues. Trimming the perch has no neg effects, and the tires dont rub at all.

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post #18 of 30 Old 03-31-2011, 08:28 AM
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Don't use a grinder when you could use Plasma!....


'06 TJ Rubi (Light Metalic Khaki) 6sp, Bought 3-10 w/6500 miles. 31 MTR's, UCF alum UHC T-case & engine skid w/ LoPro, Rokmen gas tank & steer gear skid, Ridler dif covers F/R, Warn 8274-50, Optima Yellow top, Pro Comp front 3/4" spacers, Currie 1" BL, Bomb Proof MML, Novak cable shifter, AGR Super Box 2, Warn rear bumper/tire carrier, Rubi locker mod/pumps moved to engine bay, OBA. Build to come...
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post #19 of 30 Old 03-31-2011, 08:35 AM
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Glad to hear the tire shop helped you out, they are right the guy putting the tires on should have picked up on that. They are the experts afterall and are being paid to make sure the tires/rims get mounted, installed and balanced correctly IMO.
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post #20 of 30 Old 03-31-2011, 08:40 AM
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I've got the same rims as the OP. If I trim the rear perch and adjust the steer stops what are the other neg. affects of a 12.5 tire?
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post #21 of 30 Old 03-31-2011, 08:53 AM
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Quote:
Originally Posted by NEastUnlmtd View Post
From way back with CJs we always tried to stay narrow. I found some used rims and tires, they are way outset IDK the inches. They looked silly to me when I first mounted them up. After the recent mods first flexxing out the Jeep I realized how nice it was at full droop to have the extra width, the tire tucked in perfect and kept better footing. Plus the steering etc. advantages.
The place to stay narrow is in the tires. There is little to no advantage to a 33" tire being 12.5" wide versus 10.5" wide (or even 10" if you get one of the metric equivalents. Maybe if your wheeling is done almost exclusively on sugar sand, you might want wide beadlocks with wide tires aired down low. Otherwise you just end up with more unsprung mass, more rolling resistance, more highway noise, more steering effort, more tracking issues, even poorer fuel mileage, etc.
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post #22 of 30 Old 03-31-2011, 09:29 AM
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Originally Posted by Deacon View Post
The place to stay narrow is in the tires. There is little to no advantage to a 33" tire being 12.5" wide versus 10.5" wide (or even 10" if you get one of the metric equivalents. Maybe if your wheeling is done almost exclusively on sugar sand, you might want wide beadlocks with wide tires aired down low. Otherwise you just end up with more unsprung mass, more rolling resistance, more highway noise, more steering effort, more tracking issues, even poorer fuel mileage, etc.
Isn't the advantage of running a 12.5 instead of a 10.5 occur when using it as a DD? I thought I read somewhere that running a wider tire helps reduce the wear on a tire.
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post #23 of 30 Old 03-31-2011, 10:00 AM
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What happened Boogie?....
Your avatar scared me away.
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post #24 of 30 Old 03-31-2011, 10:04 AM
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A wider tire = wider footprint which is the contact with the road under all conditions, not just when aired down. Its always a balance of trade-offs.
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post #25 of 30 Old 03-31-2011, 10:04 AM
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Your avatar scared me away.
If that ain't the pot calling the kettle black........

'06 TJ Rubi (Light Metalic Khaki) 6sp, Bought 3-10 w/6500 miles. 31 MTR's, UCF alum UHC T-case & engine skid w/ LoPro, Rokmen gas tank & steer gear skid, Ridler dif covers F/R, Warn 8274-50, Optima Yellow top, Pro Comp front 3/4" spacers, Currie 1" BL, Bomb Proof MML, Novak cable shifter, AGR Super Box 2, Warn rear bumper/tire carrier, Rubi locker mod/pumps moved to engine bay, OBA. Build to come...
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post #26 of 30 Old 03-31-2011, 10:25 AM
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Quote:
Originally Posted by Deacon View Post
The place to stay narrow is in the tires. There is little to no advantage to a 33" tire being 12.5" wide versus 10.5" wide (or even 10" if you get one of the metric equivalents. Maybe if your wheeling is done almost exclusively on sugar sand, you might want wide beadlocks with wide tires aired down low. Otherwise you just end up with more unsprung mass, more rolling resistance, more highway noise, more steering effort, more tracking issues, even poorer fuel mileage, etc.
The advantage of riding a narrow Jeep here with plentiful trails, ATV and the like is maneuverability. After seeing my outset rims stuff and droop and land in a nice place I am sold on a wider track.
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post #27 of 30 Old 03-31-2011, 10:30 AM
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While we're on the topic of backspacing...a friend of mine just gave me a pair of SpiderTrax wheel spacers (1.25"). I also just picked up some new rims (15x8 with 3.75" backspacing). I will be running these with 33x12.50 tires.

My friend seems to think I should leave the wheels spacers ON with the new rims - which would give me about 2.5" backspacing. This seems like too little - but I really don't know why or what the real safety dangers are. What say you?

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post #28 of 30 Old 03-31-2011, 10:56 AM
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You absolutely do not need to keep those spacers on there. Just go with the wheels directly to the wheel mounting surface of your axles. There's no advantage to using both (unless maybe aesthetically, though I wouldn't personally agree with that). Using both will only increase the stress on the components involved.


Quote:
Originally Posted by ForumKing View Post
Isn't the advantage of running a 12.5 instead of a 10.5 occur when using it as a DD?
No, it's actually the other way around.

Quote:
I thought I read somewhere that running a wider tire helps reduce the wear on a tire.
Who told you that? I cannot fathom what pretzel logic lead to such a statement.


Quote:
Originally Posted by TotallyScrewed View Post
A wider tire = wider footprint which is the contact with the road under all conditions, not just when aired down. Its always a balance of trade-offs.
Actually the contact patch isn't bigger, only shaped differently. The contact patch is a function of vehicle weight and air pressure. If you think of a very narrow tire, the contact patch might be a blob, something like the shape of a softball. If you think of a very wide tire, the contact patch will be shaped more like a narrow oval. For driving on the road in a Jeep, the difference between a properly inflated 12.5" and 10.5" wide 33" tire on the road is minimal in terms of stopping distance, and a lifted Jeep is not a sports car: cornering characteristics of a lifted Jeep on oversized off-road tires is going to be affected so much more by so many other limitations as to render contact patch shape a moot point. And a wider contact patch is not necessarily a good thing; wider tires tend to chase imperfections in the road surface more than narrower tires, causing it to not track as well.


Quote:
Originally Posted by NEastUnlmtd View Post
The advantage of riding a narrow Jeep here with plentiful trails, ATV and the like is maneuverability. After seeing my outset rims stuff and droop and land in a nice place I am sold on a wider track.
We're not disagreeing. Like I said, my comment was exclusively about tires, not about track. In some scenarios, full-width track is very desirable or even required, while in others you wouldn't make it between the first two trees or rocks in the trail However, generally for off-roading full-width axles would be preferable to narrow-track axles like you got on the CJ5's and older CJ7's.
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post #29 of 30 Old 03-31-2011, 10:59 AM
ChrisTJCO
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Quote:
Originally Posted by Deacon View Post
You absolutely do not need to keep those spacers on there. Just go with the wheels directly to the wheel mounting surface of your axles. Using both will only increase the stress on the components involved.
That's kind what I figured. Thanks!

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post #30 of 30 Old 03-31-2011, 11:58 AM
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yeah, to the OP, glad you wasn't going 70 down the freeway! thanks for posting the pics though. damn scary to see what could happen with improper set-up. I like the new wheels BTW
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