Become a ltxtech.com member, Click here to register!
SSS

Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 24
  1. #11
    VIP Member


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Javier
    Vehicle
    1997 Trans Am WS6
    Location
    The Final Frontier.
    Posts
    735

    Default

    reviving an old post.

    Did you ever get these wheels?

    I am thinking about getting these for my Trans Am, but I was thinking 17x9.5 in front and 17x11 out back

    OR 18x9.5 and 18x11
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  2. #12
    LTX Master


    Status
    Offline
    Join Date
    Nov 2008
    Name
    Enrique
    Vehicle
    93 Z28
    Location
    Houston/Clear Lake
    Posts
    615

    Default

    18's would be cool.
    93 Z28, 383, PI 3200, Strange 12 bolt, 3.73, Strange coilovers, suspension, and going 24X... for three years or so.


  3. #13
    VIP Member


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Javier
    Vehicle
    1997 Trans Am WS6
    Location
    The Final Frontier.
    Posts
    735

    Default

    Yea I think the 18s fill out the wheel wells so much better on the fender bulges of the bird

    http://ls1tech.com/forums/attachment...112_221712.jpg
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  4. #14
    LTX Master


    Status
    Offline
    Join Date
    Nov 2013
    Name
    Corey
    Vehicle
    94 Camaro z28
    Location
    new hampshire
    Posts
    575

    Default

    go with 18's, much better tire selection than 17's. I have RTS's on my car and love them, 18x10.5 all around.


    94 Z28 M6, 383 LT1, McLeod Twin Disk, MGW, SLP CAI, Pacesetter LTs w/ORY, E-cut out, Spintech 2OTL, Strano sways, BMR suspension, Viking coilovers, Solomon tuned
    96 Chevy K1500, 5.7L Vortec, 4l60e, 14 bolt, Volant CAI, Pacesetter LTs, Spintech 6000, b&m, 33s- DD

  5. #15
    VIP Member


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Javier
    Vehicle
    1997 Trans Am WS6
    Location
    The Final Frontier.
    Posts
    735

    Default

    Quote Originally Posted by hokeplaya05 View Post
    go with 18's, much better tire selection than 17's. I have RTS's on my car and love them, 18x10.5 all around.
    looks SICK

    what kind of offset did you go with? +50?

    what tires are those?

    I was looking at it seems like a Trans Am can get away with 17x11s down to +36mm offset, but I wonder if that means you can go that far back with an 18x11

    I took a quick look at Summit and they have +41, +43, +56 in the 18x11
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  6. #16
    LTX Master


    Status
    Offline
    Join Date
    Nov 2013
    Name
    Corey
    Vehicle
    94 Camaro z28
    Location
    new hampshire
    Posts
    575

    Default

    thanks! and yes, +50 offset. running 295/35 nitto NT05's.

    Quote Originally Posted by captainofiron View Post
    I was looking at it seems like a Trans Am can get away with 17x11s down to +36mm offset, but I wonder if that means you can go that far back with an 18x11

    I took a quick look at Summit and they have +41, +43, +56 in the 18x11
    I would say yes that makes sense, but I am not an offset guru so take that as you may lol I know there are a couple guys running 18x10f and 18x11r RTS's on Camaro's on ls1tech, not sure what offset they are using though

    94 Z28 M6, 383 LT1, McLeod Twin Disk, MGW, SLP CAI, Pacesetter LTs w/ORY, E-cut out, Spintech 2OTL, Strano sways, BMR suspension, Viking coilovers, Solomon tuned
    96 Chevy K1500, 5.7L Vortec, 4l60e, 14 bolt, Volant CAI, Pacesetter LTs, Spintech 6000, b&m, 33s- DD

  7. #17
    LTx Guru


    Status
    Offline
    Join Date
    Apr 2013
    Name
    Fred
    Vehicle
    1994 Formula - SOLD
    Location
    Central NJ
    Posts
    2,279

    Default

    I run 17x11 50mm offset on my Formula. The outer edge of the 315 tire is just under the edge of the rear fender when looking straight down from above. That's with ~8.0" backspace and ~4.0" front space. Using a 36mm offset with an 11" wide wheel puts the edge of the tire ~0.58" outside the edge of the fender. I have never seen any difference in the width of the rear fenders on any 4th Gen.... Any year, base model, Formula, or Trans Am. I've been helping 4th Gen owners with wheel and tire issues for almost 20 years.

    For a 11" wide wheel, the front space (projection of the outer edge of the rim from the face of the mounting hub) will be:

    offset vs frontspace

    41mm = 4.39"

    43mm = 4.31"

    56mm = 3.80" (may have backspace issue - rubbing)

    Anything above 4" pushes the edge of the tire outside the fender, anything under 4" pushes the edge of the tire deeper into the wheel well.

    Doesn't matter if you are using 17" or 18" wheels... Does not affect offset/front space. Ditto with "filling the wheel well". If you use the correct tire size the outside diameter of the tire will be in the range of 25.7 to 26.1", meaning if there is more wheel diameter, there is less sidewall. You could use a larger diameter tire, but then you have to correct the speedo.
    Last edited by Injuneer; 08-11-2016 at 02:46 PM.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  8. The Following User Says Thank You to Injuneer For This Post:


  9. #18
    Xtreme Member


    Status
    Offline
    Join Date
    Nov 2008
    Name
    Chris
    Vehicle
    1994 Trans Am
    Location
    PA, USA
    Posts
    2,438

    Default

    Damn @hokeplaya05 - looking good. I never considered 18's, but it does look good on your car.

    1994 Trans Am Under the knife - but it's alive!!! (5.3 LM7/CPT 60e/QP 9") BUILD THREAD
    2009 G8 GXP M6, full exhaust, catch can, cai, stereo
    1975 Olds 98 455 burnout machine/panty dropper | 1985 C10 new project

  10. #19
    VIP Member


    Status
    Offline
    Join Date
    Sep 2008
    Name
    Javier
    Vehicle
    1997 Trans Am WS6
    Location
    The Final Frontier.
    Posts
    735

    Default

    Quote Originally Posted by Injuneer View Post
    I run 17x11 50mm offset on my Formula. The outer edge of the 315 tire is just under the edge of the rear fender when looking straight down from above. That's with ~8.0" backspace and ~4.0" front space. Using a 36mm offset with an 11" wide wheel puts the edge of the tire ~0.58" outside the edge of the fender. I have never seen any difference in the width of the rear fenders on any 4th Gen.... Any year, base model, Formula, or Trans Am. I've been helping 4th Gen owners with wheel and tire issues for almost 20 years.

    For a 11" wide wheel, the front space (projection of the outer edge of the rim from the face of the mounting hub) will be:

    offset vs frontspace

    41mm = 4.39"

    43mm = 4.31"

    56mm = 3.80" (may have backspace issue - rubbing)

    Anything above 4" pushes the edge of the tire outside the fender, anything under 4" pushes the edge of the tire deeper into the wheel well.

    Doesn't matter if you are using 17" or 18" wheels... Does not affect offset/front space. Ditto with "filling the wheel well". If you use the correct tire size the outside diameter of the tire will be in the range of 25.7 to 26.1", meaning if there is more wheel diameter, there is less sidewall. You could use a larger diameter tire, but then you have to correct the speedo.
    Thanks for the clarification, as far as quarter panels I meant Camaro vs Firebird/TA. Not sure how true it is, but I hear the Firebird has wider fenders.

    Im not exactly following the front space concept, offset is the centerline of the wheel to the mounting face right?

    so from your 4" front space
    4" which equals an offset of 1.5"=38.1mm

    are you talking about the very edge of the lip?

    Can you post a pic of your 17x11 with a 50mm?

    I want what you are describing, I DONT want the tire to stick out from under the fender, I want it flush or a little under.

    roughly like this:
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  11. #20
    LTx Guru


    Status
    Offline
    Join Date
    Apr 2013
    Name
    Fred
    Vehicle
    1994 Formula - SOLD
    Location
    Central NJ
    Posts
    2,279

    Default

    An 11" wide wheel is 12" wide. 11" is the width where the tire beads sit. Add to that the ~1/2" lip/flange that holds the bead on the rim on either side, and you get 12". The 1/2" flange is not always exactly 1/2", depends on the design of the wheel. My AFS Grand Sport replica has a flange that is 0.46".

    Add 2 flanges to the 11" bead width and you get 11.00 + 0.46 + 0.46 = 11.92"

    Dividing by 2 puts the centerline of the wheel at 5.96"

    The offset is 50mm = 1.97" (to 3 significant figures).

    Add 5.96" + 1.97" = 7.93" backspace (matches manufacturers published #)

    Subtract 5.96" - 1.97" = 3.99" front space (I don't know if that's the official term, but to me it's convenient)

    I have a couple pictures I can add, but they're on my PC and I can't access that right now.

    A buddy of mine had a 1997 Camaro 30th SS convertible. He had a set of the real 17x11 Grand Sport wheels, painted white (a real GS wheel is painted gloss black). As best I can remember, his setup tucked in just under the fender edge, just like mine. I think the 37mm difference was based on information from the AFS website. They indicated the 50mm was required for the Camaro and 37mm would work on the T/A. I have a link to a photo of a T/A with American Racing 17x11 45mm wheels, and it looks like it is within 1/4" of mine. The AFS info was wrong. Just like their statement that the 17" wheels could not be used on convertibles. They fit fine, handled fine. AFS was just assuming from the fact that GM would not put 17" wheels on the SS or WS6 convertibles that they wouldn't work. My thinking was GM felt the narrower sidewall on the 275/40-17 would produce a harsher ride.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  12. The Following 2 Users Say Thank You to Injuneer For This Post:


Page 2 of 3 FirstFirst 123 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •