Ride Tech Tru turn 68 Camaro 18x9 wheel backspacing??

[Blevinator]

Hello,
I am wanting to use a full Tru Turn setup with 18x9 wheels on my 68 Camaro front end.
I will be using the stock subframe.
Does anyone know the correct wheel backspacing?
Ride tech recommends 5.75" of backspace on 18x10. Anyone use 18x9's?
Please help. Rushforth is putting my wheels together and needs a decision soon.
Thanks in advance!

[MrQuick]

Run it by Jason, If they recommend 5.75 then I would stay near that number to get you clear of the outer well. Can't go wrong with 5 1/2"

[Ron.in.SoCal]

Although I agree w Vince, I've seen first hand a few different combos w their true turn. Some work, some don't. Last combo on Cole's car was 6.25 BS on a 10" wheel and it just about works with enough camber.

I say get in there and measure. If possible try a sample wheel if you've got any buds in the area theat can loan you one for test fit. Also cycle the suspension so you know it'll clear in all situations. The good news is you're not pushing the envelope w a 10 incher so it gets a little easier. Good luck!

[MrQuick]

You know on mikies 67 I had my 18x10 6 7/8" back space with no problems. lock to lock. I WTF?

[GeoffP]

I just bought a set of Beyern "5" wheels 18x9.5 ET15 (about 5.8" backspacing) with BFG Comp 2 275/35-18's and they fit on the front fine from my initial test fit. I ran it lock to lock by hand and didn't see any issues. Note this is not on the ground yet but I'm not anticipating any problems based on my test fit.

Just realized I didn't post the ET rating on my wheels correctly - it's ET15 NOT ET5

[mdprovee]

You know on mikies 67 I had my 18x10 6 7/8" back space with no problems. lock to lock. I WTF?

I want to widen my wheels, we are going to have to look into this soon.

[bret]

You know on mikies 67 I had my 18x10 6 7/8" back space with no problems. lock to lock. I WTF?

I am struggling with the 6 7/8 backspace...at 5.75 backspace the tire will just kiss the subframe at full lock. Unless you are running some special spindle and/or brake hub setup it would seem to limit the turning radius substantially.

[MrQuick]

I was shocked myself. We didn't get to drive it but i'd like to get into it again and see for sure.





Not to thread jack. I would run less than 5 3/4" to be safe.

[MAGONSTERZ68]

Gents
1968 camaro convertible with the ridetech tru turn 2" drop spindle set up and factory control arms, stock v8 springs, generic gas shocks, Wilwood Forged Narrow Superlite 6R Big Brake Front Brake six-piston calipers with 12.88" diameter, 1 piece rotor, stock rear mono leaf, 10 bolt drum.
ridetech states i can fit up to a 18" x 10" wheel up front with a maximum back space of 5.75 and have read members have tucked 18" x 9.5" x 5.5" backspace rear with no suspension modifications.
I want to run 18 x 9.5 x 5.5 back space x 275 45 18 on all four corners. The caliper overhang from rotor face is +.02 mm and total hub offset of +.38 mm vs original drums.(track width? wilwood specs)
My question : what would my min wheel offset need to be (pad height?) in order to clear caliper yet clear outer fender inner lip edge. Why min wheel offset? Like the look of wheel lip (deep dish) I have no reservations of rolling fender inner lip to accommodate.
I would like the luxury of rotating wheels / tires front to back and visa versa. Any info would be greatly appreciated.
18 x 9.5 x 6mm offset x 5.5 backspace sound right for all four corners?

[Rod]

I use the Tru-Turn and you should be able to use 5.5 backspace on the 9" rim, I use 5.5" backspace on a 17x9.5 rim, you will have to modify the upper inner fenderwell, here you can see how far up into the fender the tire goes under heavy cornering, with the Tru-Turn the tire just kisses the frame on full lock,, with 5.5 backspace and only a 9" rim you will probably never touch the frame,

[MrQuick]

Gents
1968 camaro convertible with the ridetech tru turn 2" drop spindle set up and factory control arms, stock v8 springs, generic gas shocks, Wilwood Forged Narrow Superlite 6R Big Brake Front Brake six-piston calipers with 12.88" diameter, 1 piece rotor, stock rear mono leaf, 10 bolt drum.
ridetech states i can fit up to a 18" x 10" wheel up front with a maximum back space of 5.75 and have read members have tucked 18" x 9.5" x 5.5" backspace rear with no suspension modifications.
I want to run 18 x 9.5 x 5.5 back space x 275 45 18 on all four corners. The caliper overhang from rotor face is +.02 mm and total hub offset of +.38 mm vs original drums.(track width? wilwood specs)
My question : what would my min wheel offset need to be (pad height?) in order to clear caliper yet clear outer fender inner lip edge. Why min wheel offset? Like the look of wheel lip (deep dish) I have no reservations of rolling fender inner lip to accommodate.
I would like the luxury of rotating wheels / tires front to back and visa versa. Any info would be greatly appreciated.
18 x 9.5 x 6mm offset x 5.5 backspace sound right for all four corners?

When you order your rims you should be able to have the maker machine the center or at least verify caliper clearence.

[Rod]

Gents
275 45 18 on all four corners.

I think a 45 series tire might be to tall on the front on a 17" wheel I'm running 40 series all 4 corners(275-40-17) and the wheel well is at tire top on the front and 1inch above tire top on the rear

[MAGONSTERZ68]

thanks for the 411 Rod, good stuff.
so from the sounds of it if i run the 18x9.5x5.5bs i will deff run into fender well clearance issues as this combo is approx 1" taller in overall diameter.
Wheels: Wheel 1 Wheel 2
Wheel size 17x9.5 ET 6 18x9.5 ET 6
BackSpace 139 mm (5.5'') 139 mm (5.5'')
Typical Weight~ 28 lbs / 13 kg~ 31 lbs / 14 kg
Tires: Tire 1 Tire 2
Tire size 275/40-17 275/40-18
Section width275 mm (10.8'') 275 mm (10.8'')
Sidewall 110 mm (4.3'') 110 mm (4.3'')
Tire diameter652 mm (25.7'') 677 mm (26.7'')
25 mm (3.8%) taller.
Rim sizes17x8.5 to 17x10.5 18x8.5 to 18x10.5
Circumference2047 mm (80.6'')2126 mm (83.7'')
Revs per mile786.1 757.1
Speedometer Assuming that this is OEM tire and speedometer readings are correct. When speedometer reads 60mph (96.6km/h) actual speed will be 62.3mph (100.3km/h): 3.8% faster.
Typical Weight~ 26 lbs / 12 kg ~ 27 lbs / 12 kg
Wheel+Tire Weight~ 54 lbs / 25 kg ~ 58 lbs / 26 kg

[MAGONSTERZ68]

well looks like all the goodies have showed up just waiting on time and reinforcements aka my 22 yr old son to come back from college for summer break.

[MAGONSTERZ68]

Gent,
now looking for suitable spring rate and matching shock combo for street and rare light canyon use. or mayber even coil over as long as it can be used with factory upper/lower control arms and the above already purchased ridetech TruTurn 2" spindle drop steering geometry correcting set up. Would like it to be as firm as a modern day muscle of comparable weight. The stock coil and gas shock are way too mushy and bottoms out way too easily. Keeping the stock steel headed sbc 327 power plant for now.

[Smoker03]

I've done a similar setup in the past and had coil spring specialties build me a pair of stock height springs with 700lbs/in and then used an adjustable shock. I would suggest the ridetech single adjustable smooh body shock with that spring, you could go down in rate to 650 if you want, but I preferred the 700.

[DButler]

I have a 69 camaro with ride tech tru turn and spindles. I am running speed tech upper and lowers...Kore 3 hubs and 10" forgelines up front. The wheels were ordered from prodigy. I bought the car with then parts from a forum member. I just got car back from paint and when I turn front tires on lift the rim hit the backside of the upper control arm when turning. It doesn't have an engine or anything right now can that be the problem? The front tires are 275/35...is ridetech control arms needed to clear rims?

[bret]

I have a 69 camaro with ride tech tru turn and spindles. I am running speed tech upper and lowers...Kore 3 hubs and 10" forgelines up front. The wheels were ordered from prodigy. I bought the car with then parts from a forum member. I just got car back from paint and when I turn front tires on lift the rim hit the backside of the upper control arm when turning. It doesn't have an engine or anything right now can that be the problem? The front tires are 275/35...is ridetech control arms needed to clear rims?

Since this is an unresearched combination, a couple of questions here:

1. Backspacing on the wheels? 5.75" backspace is what we recommend IF you are using the complete Tru Turn system.
2. Exactly where is the wheel hitting the control arm? [pictures would be great] Keep in mind that on the lift, you are at full extension on the suspension, a situation that you will rarely [if ever] reproduce on the street or track.
3. I do not know the dimensions of the Kore 3 hub and brake system compared to a Baer or Wilwood system. If it is thinner it would effectively change the backspace of the wheel. You do have the rotors installed, right?
4. Is the wheel hitting the control arm hard or just kissing it? If it is hitting lightly, it may just be a matter of installing/adjusting a steering stop. If it is hitting hard, you may need to change something else.

Let us know...we can lead you through a solution.

[DButler]

I will get some pictures. I bought the car with these components on it. I am pretty sure the rotors are installed correctly. Any certain way tobinstall them? It has the baer setup. I think 2 piston..maybe 4 with 13" rotors. I just got the car back from paint. I know it will change while on lift especially since there is not an engine in it. Frank at prodigy ordered the wheels. I will post pictures this evening. I hate to seem so ignorant...car has been in paint shop for nearly a year and I just bought these wheels but they were initially built for this car just didn't get them them on initial purchase. Thanks for the help I am sure we can figure it out.

[DButler]

It is hitting the top back side(closest to firewall) and it hits there before it hits frame. I think he said the wheels were 6.75 back space but I will measure today to verify.