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.


https://www.pro-touring.com/attachment.php?attachmentid=53083&stc=1&d=1325094452


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,

https://static1.pt-content.com/images/pt/2013/05/IMG_0449_zpseaf834c4-1.jpg (http://s752.photobucket.com/user/crazyshopmonkey/media/Del%20mar%20March%202013/IMG_0449_zpseaf834c4.jpg.html)

[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 summ:machine:er 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.:hammer:

[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.

[bret]

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.

If the wheels are really 6.75" backspace you will likley need to get them rehooped. That is not as fatal as it seems...you can buy a different width rim half from Forgeline and install it yourself.

[DButler]

I hope I don't have to do that haha I will measure today to verify. Considering how much their wheels are I am scared to call and get a price haha

[DButler]

I guess I could make them 9.5" wide to be safe...also I didn't mean to high Jack your thread...sorry

[DButler]

This is where it is hitting. I was wrong it is on front side of control arm.

[DButler]

The wheels are 6.75 backspace..I am not sure 5.75 would work on the outside lip. I added a 1/4" spacer and when turning the wheel the tire is an inch or less front touching the frame when it hits front UCA. It has a pretty good turning radius. I was planning to set it up so it would hit the steering stops right before then tire kissed the frame. If I could get it to clear the UCA then I think I would have at least 90% turning radius.would I be better to get different control arms or get a back hoop and make the wheels 9" wide instead of 10" which would cut an inch of my backspace?

[MAGONSTERZ68]

anyone knows whether or not a 17x9.5 wheel clears the TRU TURN steering arm or if an 18" wheel is necessary to clear the steering arm. I see from RideTech's pic's that the arm is up inside the wheel so I'm concerned that a 17" wheel won't fit. I'm thinking a 17x9.5 with 5.5" backspacing should work just fine on the front.

[Bad94]

anyone knows whether or not a 17x9.5 wheel clears the TRU TURN steering arm or if an 18" wheel is necessary to clear the steering arm. I see from RideTech's pic's that the arm is up inside the wheel so I'm concerned that a 17" wheel won't fit. I'm thinking a 17x9.5 with 5.5" backspacing should work just fine on the front.

I ran 17's and they cleared. But all wheels are different.

[bret]

anyone knows whether or not a 17x9.5 wheel clears the TRU TURN steering arm or if an 18" wheel is necessary to clear the steering arm. I see from RideTech's pic's that the arm is up inside the wheel so I'm concerned that a 17" wheel won't fit. I'm thinking a 17x9.5 with 5.5" backspacing should work just fine on the front.

From our experience SO FAR...

A CAST 17" wheel will likley NOT clear the Tru Turn steering arm. A BILLET 17" wheel WILL likley fit. This is because the cast wheels typically have a thicker cross section in the hoop area than the billet wheel to gain strength. We've not seen any clearance issues with any 18" wheel. Also...we've NOT test fit every wheel made. It is possible there could be exceptions to our findings so far.

The 9.5" width with the 5.5" backspace will work fine with up to a 275mm wide tire.

[MAGONSTERZ68]

Bret thanks for the head up, tru turn is installed minus uca/lca with wilwood 12.88 disc kit and have yet to order wheels. Would you know the minimum hoop inner diameter necessary to clear the steering arm utilizing the 5.5 back space on a 17 wheel?

[glr0212]

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"

Whatever you do, do not order a 5.5 backspacing. especially for a 69. I would argue 5.75" on an 18x10 wont work without rubbing the outer fenders during turns and possibly even at ride height going straight!

I have an 18x9.5" wheel with 6.25" BS. The car hasnt been fully aligned but i cant turn it more than 1/2 turn before the wheels start rubbing the outer fender lip. I can't imagine what would happen if I was turning over a bump.

I think there is a huge misconception out there that because it works on a 67/68 it will work on a 69 because the fenders are wider. What's not taken into account is the fender shape. generally on a lowered 67/68 the top of the tire sits just below the fender lip. The fender has a round shape with a natural flare. On a lowered 69 the fender sits down another ½” or so over the tire and the fender flat at the top of the wheel opening. Right where the tire is apt to rub if you don’t have enough BS on your wheel.

Something that should be considered for those of you with a 69 relying on guys with 68’s to give you BS. It’s a mistake that may end up costing me a new set of wheels even though I thought I gave myself an extra 1” of fender clearance. I will try to chime back in once I have an alignment. Should happen in the next week or two.

[eric1967]

I have a 67 with 18 x 9.5 5.75 bs. I have had some minor rubbing on the pass side. I believe mine rubbed because the sub frame may be out of square to the rest of the car. Keep in mind that the type of brakes can change the track width. Also the alignment has a huge effect. If the front end is not aligned properly this can cause major tire rub.

[Rod]

Whatever you do, do not order a 5.5 backspacing. especially for a 69. I would argue 5.75" on an 18x10 wont work without rubbing the outer fenders during turns and possibly even at ride height going straight!

I have an 18x9.5" wheel with 6.25" BS. The car hasnt been fully aligned but i cant turn it more than 1/2 turn before the wheels start rubbing the outer fender lip. I can't imagine what would happen if I was turning over a bump.

I think there is a huge misconception out there that because it works on a 67/68 it will work on a 69 because the fenders are wider. What's not taken into account is the fender shape. generally on a lowered 67/68 the top of the tire sits just below the fender lip. The fender has a round shape with a natural flare. On a lowered 69 the fender sits down another ½” or so over the tire and the fender flat at the top of the wheel opening. Right where the tire is apt to rub if you don’t have enough BS on your wheel.

Something that should be considered for those of you with a 69 relying on guys with 68’s to give you BS. It’s a mistake that may end up costing me a new set of wheels even though I thought I gave myself an extra 1” of fender clearance. I will try to chime back in once I have an alignment. Should happen in the next week or two.

I know Bret just built a 69 Camaro for Goodguys, I don't think there guessing on what fits, I looked at there build and they say(It will most likely end up with a 18x9.5" wheel with a backspacing between a 5.5-5.75".) I didn't look to see what they ended with
https://static1.pt-content.com/images/pt/2013/12/50a69257166ca413c70809a70410a060_zpsa596-1.jpg

[dragonfly jones]

They told me 18x9.5 5.75 back space.

[MrQuick]

Whatever you do, do not order a 5.5 backspacing. especially for a 69. I would argue 5.75" on an 18x10 wont work without rubbing the outer fenders during turns and possibly even at ride height going straight!

I have an 18x9.5" wheel with 6.25" BS. The car hasnt been fully aligned but i cant turn it more than 1/2 turn before the wheels start rubbing the outer fender lip. I can't imagine what would happen if I was turning over a bump.

I think there is a huge misconception out there that because it works on a 67/68 it will work on a 69 because the fenders are wider. What's not taken into account is the fender shape. generally on a lowered 67/68 the top of the tire sits just below the fender lip. The fender has a round shape with a natural flare. On a lowered 69 the fender sits down another ½” or so over the tire and the fender flat at the top of the wheel opening. Right where the tire is apt to rub if you don’t have enough BS on your wheel.

Something that should be considered for those of you with a 69 relying on guys with 68’s to give you BS. It’s a mistake that may end up costing me a new set of wheels even though I thought I gave myself an extra 1” of fender clearance. I will try to chime back in once I have an alignment. Should happen in the next week or two.
In that post that you quoted me I was referring to the 9" wheel. It has fit fine for me in the past but I measured more than once before I committed. And its what I recommend for everyone to do.
I'd prefer and have used a 6" BS on a 10" wheel.

[Cdog]

If the front fenders and inners were widened 1 inch on a 69 Camaro how much more wheel/tire/backspace would work with the ride tech true turn set up? Could a 305/18 fit?

[MAGONSTERZ68]

Ended up using 275/35/18 x 18x9.5 c5 wheels with 7.3 backspace and a 2.0" spacer at all four corners. Had to modify upper outer fender well and roll lips with a 4" front end drop and alignment went as per Ridetech specs car does not rub at any point, right or left full lock under compression nor bottoms out with the hotchkiss 600 lbs springs and fox shocks doing work.

[dragonfly jones]

Ended up using 275/35/18 x 18x9.5 c5 wheels with 7.3 backspace and a 2.0" spacer at all four corners. Had to modify upper outer fender well and roll lips with a 4" front end drop and alignment went as per Ridetech specs car does not rub at any point, right or left full lock under compression nor bottoms out with the hotchkiss 600 lbs springs and fox shocks doing work.
Do you Have any pics of the finder mods?

[MAGONSTERZ68]

Do you Have any pics of the finder mods?

i elected to mimic the mods use on the 48hr camaro system is not allowing me to upload any more pics?

[67-427]

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!

What did you end up with. I was going back and forth between 5.5 and 5.75 . I ended up ordering a 18 x 9 with 5.75 bs . I hope they fit, they should be here any time now .

[Blevinator]

What did you end up with. I was going back and forth between 5.5 and 5.75 . I ended up ordering a 18 x 9 with 5.75 bs . I hope they fit, they should be here any time now .

I ordered 18x9 with a 5.5 bs for the front
18x12 5.5 bs rear

[67-427]

Did you have any rubbing issues? How was the fit with 5.5 bs ? I am doing C5 brakes it is supposed to be 5 mm wider that stock track width . I am hoping it will but rub the fender. I can't wait to put them on and try it out. Waiting is terrible.

[jonjonw]

I know this is an older thread but how did your 18x9 5.5 and 5.75 BS work out for your guys? What size tire did you end up going with?

[ra11ysport]

If you plan on running a 275 tire plan on doing some fender work. When i had mine a 9.5 rim with a 275 tire rubbed the frame with 5.5bs and there was about a 1/4in space from the ridetech muscle bar. Ridetech says it will fit but?

[paulk68]

Throwing this back up to the top I am going to run a 18x9 front wheel with the ridetech tru turn with a 255/35/18. Deciding between the 5.5 and 5.75 bs. Leaning to the 5.75 to leave my self some room to push it out with a small spacer if I need to. Wondering if any of you guys with the 18x9 and 5.5 or 5.75 cam chime back in about fit.

[dhutton]

Throwing this back up to the top I am going to run a 18x9 front wheel with the ridetech tru turn with a 255/35/18. Deciding between the 5.5 and 5.75 bs. Leaning to the 5.75 to leave my self some room to push it out with a small spacer if I need to. Wondering if any of you guys with the 18x9 and 5.5 or 5.75 cam chime back in about fit.

If you are only going to run a 255 tire go 8.5" with 5.5" backspacing. No need for a 9" wheel with a 255 tire. If you are set on 9" then go 6" backspacing.

I put 8.5" with 5.5" backspacing with a 255/40 tire on my wife's 69 and it fit great. Pushing it out another 1/2" with a 9" wheel and 5.5" backspacing would have rubbed without a lot of negative camber....

Don