HELP!!!!!!!!! I need the correct back spacing specs NOW!!!
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
HELP!!!!!!!!! I need the correct back spacing specs NOW!!!
I'm just about to order the wheels from company called hotrod usa. The wheel are TT II2s in 20" diameter. I'm going to get 8" wide wheel in front and 10" in rear. I think I should be fine with 4" back space in rear, is this correct? How'bout front? Is it any different, and I can use 4" as well?
ANOTHER QUESTION: What does BACKSPACE DEEP REVERSE mean???
Hopefully someone can come up the right info on this quickly.... :cheers:
TIA Jay
ANOTHER QUESTION: What does BACKSPACE DEEP REVERSE mean???
Hopefully someone can come up the right info on this quickly.... :cheers:
TIA Jay
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (flynhi)
I'm using offset trailing arms so does this make any difference?!?!?!?!?!?!? CAN I GO FOR4.5" in rear!?!?!?!?!?!?
Quickly guys!
Thanks again!
Quickly guys!
Thanks again!
Melting Slicks
Joined: Mar 2001
Posts: 2,899
Likes: 2
From: Summerville SC
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
You could just measure the back spacing of your wheels :D Factory back spacing is 4"s ...With the offset trailing arms you just might be able to pull it off with 4.5" back spacing :cheers:
[Modified by Intimidator454, 2:48 PM 1/11/2002]
[Modified by Intimidator454, 2:48 PM 1/11/2002]
Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
What does BACKSPACE DEEP REVERSE mean???
Hopefully someone can come up the right info on this quickly.... :cheers:
TIA Jay
Hopefully someone can come up the right info on this quickly.... :cheers:
TIA Jay
Burning Brakes
Joined: Aug 2000
Posts: 1,080
Likes: 1
From: Frankfurt, Taunus Hills
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
Jay,
its not this difficult!
Imagine the wheel when you stand behind the car.
The exact half from horn to horn is called the centerline.
Backspacing results in the difference of centerline to the wheels mounting flange. Which can be positive or negative - this means the flange is more to the outer side of the rim or to the inner side of the rim.
This is different from wheel to wheel.
Centerline on a 10" rim is exactly at 5"
Centerline on a 8" rim is at 4" (always the half!)
What you need to check is how inches you can afford to look to the inside of the car (limits here are often the trailing arms [not in your case, not with the offsets] or the Spring and the mounts.
In the front the steering knuckles give the limit most times.
I recommend some tries with a BMW rim, this should be easily available in Finland. They have the same bolt circle, so you can use them for measurement.
I hope I could help you this time.
I´m checking for the delivery of your car in frankfurt, but I need a copy of the build sheet. If you can mail it to me???
its not this difficult!
Imagine the wheel when you stand behind the car.
The exact half from horn to horn is called the centerline.
Backspacing results in the difference of centerline to the wheels mounting flange. Which can be positive or negative - this means the flange is more to the outer side of the rim or to the inner side of the rim.
This is different from wheel to wheel.
Centerline on a 10" rim is exactly at 5"
Centerline on a 8" rim is at 4" (always the half!)
What you need to check is how inches you can afford to look to the inside of the car (limits here are often the trailing arms [not in your case, not with the offsets] or the Spring and the mounts.
In the front the steering knuckles give the limit most times.
I recommend some tries with a BMW rim, this should be easily available in Finland. They have the same bolt circle, so you can use them for measurement.
I hope I could help you this time.
I´m checking for the delivery of your car in frankfurt, but I need a copy of the build sheet. If you can mail it to me???
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Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
This is getting way too complicated. Is there anyone using 10" wheels with offset trailing arms??
Front 17X8 Torq Thrust II, 4" backspace
Rear 17X9.5 Torq Thrust II, 5.5" backspace
Regardless of how wide your wheel is, I found that 5.75 inches with the offset TAs to be about max. Actually, the frame is the limiting factor. You will have no problems installing them, but they may stick outside the fender more than you want. Mine are 1.5 inches into the wheel well farther than yours would be...
Another consideration - if you have a rear torsion bar, it may contact the wheel... I don't have one.
[Modified by Z-man, 7:11 PM 1/11/2002]
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (Neo Fender)
Neo Fender: This is what the add says:TQ II 20X10 DEEP REV
"TORQ THRUST II'S 20X10 WITH 3" TO 4.5"" BACKSPACE DEEP REVERSE FORD/CHE". So IF I can use 4.5" Back Spacing I could use these wheels?!?!?!?!?!?!
"TORQ THRUST II'S 20X10 WITH 3" TO 4.5"" BACKSPACE DEEP REVERSE FORD/CHE". So IF I can use 4.5" Back Spacing I could use these wheels?!?!?!?!?!?!
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (454Big)
454Big: Thanks for your input. Those orinal wheels were always getting on the way, so I moved them to my brothers place, so I don't have any wheels here with me. I can get my original wheels here in two weeks but that is way too late.... :(
I even used to own 750 BMW which I could have used to take the measurements, but I just traded it for V6 Passat, go figure?!?! :lol:
I'll try to email that build sheet to you ASAP.
Jay
I even used to own 750 BMW which I could have used to take the measurements, but I just traded it for V6 Passat, go figure?!?! :lol:
I'll try to email that build sheet to you ASAP.
Jay
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (Z-man)
Z-man: Do you reckon I could go all the way to 5.5" Back Space in the back??? The tire set up is going to be 285/30/20 do you think I'll be safe with these set up? I'll add the flares only If the wheels stick out too bad!
BTW that is one sweet ride you got there! :cheers:
[Modified by groovyjay, 9:03 PM 1/11/2002]
BTW that is one sweet ride you got there! :cheers:
[Modified by groovyjay, 9:03 PM 1/11/2002]
Instructor
Joined: Dec 2001
Posts: 113
Likes: 0
From: Grand Rapids MI
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
I run 6" backspacing on an 11" rim, but the tire is close to the frame and rubs once in a great while. 5.5" would never hit on my setup, but I don't know if your offset arms are the same as mine. Anyway, if you bought the offset arms, ask the place where you bought them how much backspace they allow. Thats what I did and they told me 5.5". They were exactly right. So I ran 6". :)
Instructor
Joined: Dec 2001
Posts: 113
Likes: 0
From: Grand Rapids MI
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
Also, if you run a 10" wide rim with 5.5" backspace and a 285mm tire, it won't stick out. If you are considering flares, run a 315mm tire and an 11-12" wide rim.
Matt
Matt
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (Matt M)
Thanks Matt M, I got the Trailing Arms from VB&P, should give 2" more room per side so with stock back space which is 4" that would make 6" so shoul I go for 5.5"???
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (Matt M)
Thanks Matt. I'll try to order the wheels on monday. I'll let you guys know how it turned out!
Thanks for everyone! :cheers:
Thanks for everyone! :cheers:
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (groovyjay)
Z-man: Do you reckon I could go all the way to 5.5" Back Space in the back??? The tire set up is going to be 285/30/20 do you think I'll be safe with these set up? I'll add the flares only If the wheels stick out too bad!
BTW that is one sweet ride you got there! :cheers:
BTW that is one sweet ride you got there! :cheers:
Good luck...
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 8,220
Likes: 208
Re: HELP!!!!!!!!! I need the correct back spacing specs NOW!!! (Z-man)
Thanks everyone!!! You're are the greatest!!! I ordered the wheels yesterday as I did order all the Clutch parts from Summit, and Summit told me that I have reached my VISAs limit, so now I'll have to wait until I get the bill here so I can pay them. :) :eek: :D
I'll keep you posted along the way!
Jay
I'll keep you posted along the way!
Jay
