Why do people have tire carriers with forward tilt instead of backward? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 11-07-2017, 06:31 AM   #1 (permalink)
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Why do people have tire carriers with forward tilt instead of backward?

I see a lot of rigs around here with spare tires mounted with the tire top angled towards the front of the jeep. For approach, a rear roll and for protection wouldn't you benefit from have the top of the tire angled backwards at an angle equal to your rear approach (like a stinger?)

[I can't post photos yet so imagine a prerunner with the spare mounted in the bed]

I'm rewelding my tire carrier today to clear some jerry cans behind the tire and am considering adding a negative angle to the tire.

I've got a CJ5 that's currently only extended to 89.5" (need to do the rear) so I feel like my spare could almost work as a rear stinger?
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Old 11-07-2017, 06:37 AM   #2 (permalink)
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If I had to guess, it'd have something to do with improving the CG of the rig.


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Old 11-07-2017, 06:38 AM   #3 (permalink)
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Weight bias. Rear tilting shifts weight further back (albeit slightly) and may make a short rig nose light. Also, leaning it forward puts the center of mass of the tire closer to the rear axle fulcrum point and thus applies less dynamic force to the structure when bouncing around opposed to something leaning far away from the axle. I've seen some tire carries that were too far back, or with a backwards lean break off when the rig got bouncing too badly in a climb. Design had a lot to do with it as well, but... Just my $0.02.
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Old 11-07-2017, 07:17 AM   #4 (permalink)
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The weight relative to the axle is an excellent point. I'm already regretting moving out the tire to carry the Jerry Cans but with a 12 gallon tank and no gauge I would feel a lot better when I take it up to Colorado this year.

I really wanted the cans as hidden as possible and lower instead of having an extra 100 pounds (2x 10 gallons) that high up

I think I'll just move it back with 1/4" of clearance on the jerry can mounts and consider building a new carrier after the rear stretch. I'll be adding a lower tube to better support the tire and a couple scraps of angle as well.

Thanks guys.
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Old 11-07-2017, 09:18 AM   #5 (permalink)
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Old 11-07-2017, 11:52 AM   #6 (permalink)
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Also, it kinda sucks holding up a big ass tire and wheel and trying to get the lug nuts threaded on
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Old 11-07-2017, 12:09 PM   #7 (permalink)
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So the !*^%*^&$#@ wheel doesn't slide onto my leg or foot, when the last lug nut comes off!!!
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Old 11-07-2017, 12:10 PM   #8 (permalink)
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Also, it kinda sucks holding up a big ass tire and wheel and trying to get the lug nuts threaded on
This^^^^

Its way easier to throw tire into place instead of holding it up..... Probably 98% of why they are mounted the way they are....
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Old 11-07-2017, 06:17 PM   #9 (permalink)
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I will dig up a pic of mine or take one in the morning with light. I mounted mine with the base of the tire tucked in as far as possible. I did what you are referring to as negative tilt in order to mount a roto can and my jack behind the tire. I also made the hinge at a slight tilt so it opens easier. It gradually opens which is nice.

I have 40" tires so it is a nightmare to get up there but I have a 2" tube between where the studs are so that I can throw it up there then line the studs up. If I wheel steep stuff or don't have the kids I put the tire in the back of the jeep so I don't have all that weight off the ass.

I have made a number of tire carriers for different rigs and this was the first I tried this on and have liked it. It makes it a nightmare to steal my stuff bolted on behind the tire and it opens nice. Being tucked in at the base I rarely hit it on things.

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Old 11-07-2017, 06:29 PM   #10 (permalink)
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Also, it kinda sucks holding up a big ass tire and wheel and trying to get the lug nuts threaded on
yeah, holy shit. who the hell wants to try and hold a 150+lb tire setup with one hand overhead while trying to tighten the fucker down

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Old 11-08-2017, 07:00 AM   #11 (permalink)
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LOL I didn't even think about the angle and trying to lift the fucking tire!! But honestly it's not like you pull your spare too often so not a big deal. Wish I had done it, but redoing it would be simple enough
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Old 11-08-2017, 07:19 AM   #12 (permalink)
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Quote:
Originally Posted by amgraham View Post
Also, it kinda sucks holding up a big ass tire and wheel and trying to get the lug nuts threaded on
Quote:
Originally Posted by [email protected] View Post
This^^^^

Its way easier to throw tire into place instead of holding it up..... Probably 98% of why they are mounted the way they are....
Quote:
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yeah, holy shit. who the hell wants to try and hold a 150+lb tire setup with one hand overhead while trying to tighten the fucker down
That's only assuming the tire goes on from the back (negative) side of the angle... The OP is talking rear stinger, and there are plenty of drop down rear stinger ideas that have the tire tilted back when stowed but the stinger swings out or drops down to mount/unmount the spare from the back tilting (positive) angle side.










Weight concern is still an issue in my mind. That's a lot of weight to be hanging even further back than it already is. And flip up carriers are a bitch with a big heavy spare (usually packed with mud and crap after pinching a sidewall on the trail)...not to mention being a two-person operation to hold up and repin. But to each their own.
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Old 11-08-2017, 07:36 AM   #13 (permalink)
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.And flip up carriers are a bitch with a big heavy spare (usually packed with mud and crap after pinching a sidewall on the trail)...not to mention being a two-person operation to hold up and repin. But to each their own.
Ah, the compromises we make to carry a spare.

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Old 11-09-2017, 01:37 PM   #14 (permalink)
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Weight and packaging. Horizontal over the rear axle would be nice.
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Old 11-10-2017, 04:11 PM   #15 (permalink)
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Weight and packaging. Horizontal over the rear axle would be nice.
I did it that way but with room underneath for cargo.
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