wheel backspacing ignorance...can someone explain it to me like I am 5 years old?? - JeepForum.com
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post #1 of 20 Old 02-05-2010, 05:07 AM Thread Starter
Nute4Christ
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wheel backspacing ignorance...can someone explain it to me like I am 5 years old??

I want to keep my stock canyon rims...but I see on here that the backspacing is not enough.....I know about wheel spacers. but how is backspacing measured and how much will i need to run stock canyons with 33x12.50's? please share.

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post #2 of 20 Old 02-05-2010, 05:21 AM
99TJSahara
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less backspacing=wheels stick out further
more backspacing=wheels tuck in
Your canyons have 5.5 backspacing, spidertrax(1.25'') spacers will put your backspacing at 4.25, you will be fine with canyons and spacers

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post #3 of 20 Old 02-05-2010, 05:39 AM
robncar
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Agree with 99TJSahara, well said and succinctly put...

Backspace is the measurement taken from the backside wheel edge to the mounting surface as in the picture below. This wheel would have a backspace of about 3.75 if I'm reading the tape correctly.
Attached Thumbnails
mufp_0612_02z+ford_mustang+wheel_backspace.jpe  

http://www.jeepforum.com/forum/f9/diy-alignment-kit-steps-w-pics-2264465/
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post #4 of 20 Old 02-05-2010, 07:48 AM
TheBoogieman
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wheel backspacing ignorance...can someone explain it to me like I am 5 years old??

Get your widdle itty bitty wheel spacers that are 1.5" thick and put your big ol knobby tires on your factory wheels.
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post #5 of 20 Old 02-05-2010, 08:19 AM
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modified a bit

Even better.....
Quote:
Originally Posted by TheBoogieman View Post
Get your widdle(spongebob squarepants) itty bitty wheel spacers that are 1.5" thick and put your big ol knobby(dora the explorer) tires on your factory wheels.
Rotflmao!


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post #6 of 20 Old 02-05-2010, 08:38 AM Thread Starter
Nute4Christ
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Quote:
Originally Posted by TheBoogieman View Post
Get your widdle itty bitty wheel spacers that are 1.5" thick and put your big ol knobby tires on your factory wheels.
ha ha ha! I deserve that!
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post #7 of 20 Old 02-05-2010, 08:50 AM
champelite210
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One guy says 1.25 the other says 1.5. Which one is it that doesn't rub?

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post #8 of 20 Old 02-05-2010, 09:14 AM
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Quote:
Originally Posted by champelite210 View Post
One guy says 1.25 the other says 1.5. Which one is it that doesn't rub?
Either will work.I have the RC 1.5" wheel spacers on mine and no rubbing at all.
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post #9 of 20 Old 02-05-2010, 09:31 AM
hawk3ye
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I'm using 1.25" spacers with the exact setup you mentined...if u have any sort of lift, double check to make sure there's no tire rubbing the rear drivers side coil spring perch...it's a disc looking thing where the big coil spring kinda gets held in

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post #10 of 20 Old 02-05-2010, 10:18 AM
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Quote:
Originally Posted by Nute4Christ View Post
I want to keep my stock canyon rims...but I see on here that the backspacing is not enough.....I know about wheel spacers. but how is backspacing measured and how much will i need to run stock canyons with 33x12.50's? please share.
Granted you have an adequate amount of lift, Spidertrax 1.25" spacers will give you plenty of backspacing to clear a 33x12.50 wide tire. Canyon wheels have 5.5" of backspacing, so with the 1.25" spacers you'll have a net backspacing of 4.25". The maximum amount of backspacing you can get away with without extreme rub with a 12.50 wide tire is 4.5" of backspacing. I still have my Canyons and I'm running a 35x12.50 tire. No rub issues. All I had to do was add two washers to my steering stops to keep the rubber out of the LCAs.

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post #11 of 20 Old 02-05-2010, 05:37 PM
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Here, this is fun to play with.
Wheel / tire size calculator / comparer - BIGCUSTOMWHEELS


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post #12 of 20 Old 02-08-2010, 11:54 AM
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what about lift?

I'm trying to do exactly the same fit 33-12.50/15 on Canyons, and am ignorant as h... about this, but don't we have to consider lift and whether or not adjustable track bars or brackets got installed?

I have 2" lift and axles are now offset maybe 1/2" left and right of stock positions


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post #13 of 20 Old 02-08-2010, 12:58 PM
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Quote:
Originally Posted by SpaComponents View Post
I'm trying to do exactly the same fit 33-12.50/15 on Canyons, and am ignorant as h... about this, but don't we have to consider lift and whether or not adjustable track bars or brackets got installed?

I have 2" lift and axles are now offset maybe 1/2" left and right of stock positions

If I translated your comments correctly, you have a 2" lift and you have a 1/2 axle shift and you want to go with 33x12.5 tires?

You need a 1.25" or 1.5" spacer for sure. After tire installation, even with the spacers, double check whether your coil spring perch on the driver rear side is rubbing your tire or not, this is important as you may damage your tire's inner side wall. Sorry I don't have pix show this but there's plenty here on the forum to show what I'm talking about, look up "coil spring perch rub" or something to that effect.

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post #14 of 20 Old 09-26-2010, 09:08 PM
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less backspacing=wheels stick out further
more backspacing=wheels tuck in


Alright so a wheel with 4.5 back spacing will be tucked in CLOSER to my Jeep than a wheel with 3.75? Why is something so simple so F...ING confusing? It just doesnt make sens to me? The way I see it..okay if the mounting surface is deeper into the rim, I would believe that it would stick out farther? Idk man this sucks I just want my wheels not to rub on my CAs when I turn!!!
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post #15 of 20 Old 09-26-2010, 09:11 PM
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Quote:
Originally Posted by 94ZJ-318 View Post
Alright so a wheel with 4.5 back spacing will be tucked in CLOSER to my Jeep than a wheel with 3.75? Why is something so simple so F...ING confusing? It just doesnt make sens to me? The way I see it..okay if the mounting surface is deeper into the rim, I would believe that it would stick out farther? Idk man this sucks I just want my wheels not to rub on my CAs when I turn!!!
I think you need to think about it a little more. Mounting face deeper in the wheel means less wheel outside the mounting face and thus wheel sticking out less.
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