Brake upgrades and wheel fitment

[Justins86bird]

Since there has been alot of different brake upgrades, I have decided to create this thread to list which wheels will fit with which brake upgrades.

If you have upgraded your brakes, please post which brake upgrade you did and which rims (stock or aftermarket) it fit with (or didn't fit).

Please only post wheel fitment info here, not general brake ones.

Thanks!

[Justins86bird]

I'll start off.

1LE front brakes fit with stock 15" crosslace Firebird rims
1LE front brakes fit with 17" Ronal R15 Firehawk rims
LS1 rear brakes fit 17" Ronal R15 Firehawk rims
LS1 rear brakes do not fit with stock 15" crosslace Firebird rims

[semiller26]

C5 front brakes will fit under 17" ROH Snypers.

<img src="http://memimage.cardomain.net/member_images/5/web/473000-473999/473585_59_full.jpg">

[ebmiller88]

13" C4 HDs fit stock 16" Iroc wheels and 16" stock Z28 alloys and larger wheels;

12.75" C5s fit most 17" and larger wheels, but will NOT fit Torque Thrust IIs without either grinding a bit off the caliper or fitting a small spacer behind the wheel (Contact Chevy Ken for more info);

12" LS1 front brakes fit 16" Iroc and Z28 wheels, and 16" Formula wheels; They'll clear 16" GTA crosslace wheels WITH a spacer between the wheel and hub other wise the caliper will hit the back of the spokes (See LS1 thread in FAQ);

12" C4s will fit most 15" wheels and larger, IE 15" 5 star alloys;

12" 1LEs will fit some 15" wheels and all larger sizes.


Ed

[DuronClocker]

LS1 rear brakes clear the TA honeycomb-style rims, but with very little clearance between the caliper and inside diameter of rim.

LS1 rear brakes also clear 16x8 4th gen salad shooters (which somewhat makes sense obviously).

I have a pair of IROCs with drag radials in the basement that I'll have to bolt up to check as well.

[RTFC]

Here's measurements I calculated and posted in a post on 9/8/04 showing the different offsets with various brake kits. This info will help with any change of total offset of the wheel and brake assembly.


["I have some confirmed offset figures for scrub radius between the different brake setups. All figures are measured with a factory 16" "Fronts" Iroc rim with the standard offset of 0mm.
Measured from the spindle mount hole for the 1LE bracket going outward.
----------------------------

Standard Non-1LE front -small bearings(10.5" rotor)
3.630"

1LE brake setup- large bearings (12" rotor)
*THIS IS THE FACTORY STANDARD FOR 245/50-16 tires on an 8"wide rim*
3.948" [+.318 offset, or just over 5/16"]

My setup-large bearings (12.9" rotor) with a 3/16" wheel spacer for rim to caliper clearence
3.967" [+ .337" offset, or just over 5/16"}

13" C4 HD's on 1LE hub-large bearings(13" rotor)
4.248" [+.618" offset, or just shy of 5/8"]

13" C4 HD's on std hub-small bearings(13"rotor)
3.930" [+.300" offset, or just shy of 5/16"]

C5 setup on stand or 1LE hubs (12.75" rotor)
No clue?If anyone has a "+ or - "offset from any of the combo's above- please contribute."]

[18inchboyds]

c5s will not fit 18 inch boyd coddington smoothies, they look like tt2's . The caliper either has to be ground like chevyken did or do like i did and use a 5/16 inch spacer, but i think 1/2 woulda worked but never found a half inch spacer.

[paul_huryk]

Does anyone know if the Ronal 17" Firehawks will clear the Baer 13" Track system. Also if the 10 spoke 2000+ 17" Camaro wheels?

Thanks in advance

[ebmiller88]

They should clear both but no problems with the 4th gen wheels, I'm sure of that. It will depend on the backspacing on the Ronals.


Ed

[DuronClocker]

Got a chance to get out on my car to do some work today. Update to LS1 rear brakes.

The older IROC 16x8 wheels fit without a problem. They have a decent amount of room behind them actually. Quite a bit more than my honeycomb TA style ones had.

The 15x4" donut spare tire will NOT fit, and neither will the N64 aluminum space-saver spare tire. They'd require a decent sized spacer to be run with the LS1 rears.

Oh, and the 18x9.5" vette wheels fit without a problem, but I think most people know that'd work

[erictheviking]

When I get some new wheels,I was thinking of getting 4th gen pattern ones and use adapters.I was thinking this would give me the extra clearance to fit the wide porsche calipers I have.Does this sound like a good idea?Because of where I live,it's not easy to get my hands on a wheel to try the spacing.I was thinking of using 17" Boyd Hotrod wheels.Has anyone else got experience of these wheels and big calipers?

[slowTA]

Does anyone know if the C4 HD kit would work under a set of SLP ZR1 replica wheels? The diameter of the rim at the mounting pad is 14.75" and opens up to 16.75" at the inside lip. Thanks.

http://www.slponline.com/view_product.asp?P=81000

[Cadillac]

I'm really interested in the content of this thread but here is my perspective. I have a totally stock braking system that I am not happy with. I definitely want an upgrade.

Where do I start? What are the costs and what should I expect to pay for new components?

Knowing the fitment is certainly key...

[Firebird 383]

Now that I have a C4HD kit on the way, I'm looking for some new 17" wheels. Since this kit moves the wheels out almost 5/8" per side, I want opinions as to what backspacing I would need for a 17x8" wheel.

Math owns me.

[Cadillac]

Originally posted by Firebird 383
Math owns me.

I'm more of a driver than a mathematician too.

(and I still need a brake upgrade --but this time with GTA's to consider)

[Nate86]

Originally posted by Justins86bird
I'll start off.

1LE front brakes fit with stock 15" crosslace Firebird rims
1LE front brakes fit with 17" Ronal R15 Firehawk rims

Are you referring to the 20-slot concave wheels or were there some other 15" wheels that came on the Firebirds?

I am interested in upgrading my brakes very soon and 1LE seems like it might be a good investment. I do not want to change the stock wheels.

[rstanko]

How can you tell the difference between large and small bearing rotors? What are the dimensions?

[Roads88]

What are the "1LE" front brakes. What car were they origanly used on or is it a company.

Can you tell I know diddle about brakes?

Buy the way im running the GTA rims in black.

[Cadillac]

I've been watching this thread for a long time now. Getting details is like pulling teeth but I suspect if we do a search for a long enough time, all will be made clear.

Call me lazy.

[iansane]

Originally posted by ebmiller88
12" LS1 front brakes fit 16" Iroc and Z28 wheels, and 16" Formula wheels; They'll clear 16" GTA crosslace wheels WITH a spacer between the wheel and hub other wise the caliper will hit the back of the spokes (See LS1 thread in FAQ)

Does this apply to the c5 calipers? My car came stock with the slip on spacer on the drum rear (which I actually saved when I swapped rears for discs.) Would that slipon be enough of a spacer?

[Affe]

Wondering if 18"x9,5" Vette C6 Z06 wheels (et 50)(with 2" adapters of course) will clear Wilwood 13" frontbrakes (sold on hawks, Thunderracing etc.)

also wondering how wide you can go with these rims before rub, ? 265-tires? 275?...

[iansane]

Originally posted by Nate86
Are you referring to the 20-slot concave wheels or were there some other 15" wheels that came on the Firebirds?

I am interested in upgrading my brakes very soon and 1LE seems like it might be a good investment. I do not want to change the stock wheels.

I would assume this would mean the wheels optioned on later base model birds that resembled the GTA/TA crosslace wheels only in 15" but then again we know what happens when you assume.

[z28355]

I was wondering if a set of 96 camaro c4 style rear disc set up would fit my 15by10in cragers on the back of my 83 z28

[B Rhodes]

slp 17" Zr1 look alikes fit C5 front brakes and C4 HD front set up about 1/16" between rim and caliper on C5.

[iansane]

Originally posted by iansane
Does this apply to the c5 calipers? My car came stock with the slip on spacer on the drum rear (which I actually saved when I swapped rears for discs.) Would that slipon be enough of a spacer?

Originally posted by ebmiller
A C5 setup won't fit GTA wheels, it's just too big. It's the combination of the rotor and caliper. A LS1 setup does fit by using the spacer you mentioned (yes, rear drum spacer) to get the caliper to clear the spokes. Otherwise, the caliper hits the spokes

LS1's it is for me!

[mpsoldier]

how big of a spacer are we talking about for C5 brakes to fit a torque thrust II 17x8 with 4inchs backspacing and -11.43mm? or would the same rim 17x8 with 4.75inchs backspacing and 7.62mm offset fit better?

[Thunderfest]

I want to save this info here - hopefully this part 2 won't get erased like a mod deleted part on on the suspension board. I will redo part one later.

------
part 2
Diameter does not change offset, width does.

So with the above figures on those perticular brake mounting surfaces and 8" wide rims, you should be able to simply add the width of the rim to the backside and subtract half the new rim width difference to the offset to match the same outer tire edge overall.

example- 8" to a 9" is 1 inch difference on the inner wall of the rim so half that difference is .5" or 13mm. Since the new rim is wider, the center line of the rim changes so a new offset calculation is needed.

We now start with a 9"rim that has a centerline (o offset) +.5" or +13mm inward from the 8" rim. Subtract the difference.
+5mm subtract +13mm = -8mm offset

So a 9" rim on Standard brakes would need a -8mm offset for maximum turning radius clearance without hitting the fender in suspension travel.

From what I have measured on my car and being so lowered, I would never go larger than a 9" wide rim and a 10.2" tire up front.