Stock 6" 3 nub wheels on 12" CPP disc brakes?
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I have a '68 that I converted to a CPP power disc brake kit with 12" rotors. I haven't mounted them yet but I'd like to know if these stock 3 nub wheels with clear the larger diameter rotors? Right now I have a set of 8" four nub 4x4 wheels on it. They're to wide for my liking on the front so I picked up these stock wheels for it. I'm not sure if there 5.5" or 6" wide. One day after work, I plan on jacking the truck up and trying one.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
three nub are normally an indicator of pre-disk brake days, they may not fit because of the shape of the inside of the rim. Rotors aren't the issue, the inside of the taper between wheel center and rim rubs the caliper. 71+K wheels fit over STOCK calipers - so you'd need to find a stock skinny set of K5/10 wheels from 71 or newer. Since you have the 3 nubs, I'd still give it a try before mounting tires just like you mentioned - but 3 nubbers normally won't clear the caliper, sorry.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Yea I have 71 or newer four nubs on it all around now. Tally hoping to run a skinnier front wheel.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I don't think the three nubs will work. They won't even clear stock rotors and calipers
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Man this is a huge bummer! I guess I'll have to buy two aftermarket wheels.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Couldn't I just run a 3/8" wheel spacer?
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I think the first thing you need to do is physically install the wheel and go from there...
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Three nub wheels were made for drum brakes and when disc brakes came along they started stamping four nub centers. What you need are stock wheels from a 71-91 K5 or K10 truck or Suburban. Those had six lugs and disc brakes.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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I'm trying to run a narrower front wheel and tire. These K5 wheels are wider than I want on the front. |
Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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So I tried a wheel out this morning. They went on fine without hitting or rubbing on the rotor itself. The problem is, the wheel rubs on the caliper. I took photos showing the rub marks and also showing the clearance for the rotors.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Yes, as stated above in the beginning - the calipers are the problem, not the rotor. At least now you know for sure. Standard 6 lug 71 and newer K5/10 wheels were 6" wide. If you want narrower than that, you'd probably need to go custom. How wide are your current 4 nub wheels? The next step up from 6" for a stock (optional) 6 lug K5/10 wheel is 8.25". There were 5" wide optional 6 lug wheels available, but I've never seen any personally - but not sure you're seeking something that narrow. It sounds like the standard 6" 71 and newer K5/10 wheel is what you're looking for? Might want to post a WTB ad. They're out there, and, to be honest, it seems the 8.25" wheels bring more $, so maybe someone can help you out with your WTB. They are a niche wheel though -highly sought after by the pre-71 crowd (including 60-66) because many folks are doing exactly what you are doing - disk retrofit onto a truck that never had stock wheels that would clear the calipers. There is always the aftermarket if you can't find originals though. Hope that helps.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Grind down that caliper. I had to do that to mine.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I never heard of anyone doing that to make them fit, with all the talk about the nubs/drum/disc thing here. Good to know. I know I ground the K/20 calipers on my first '71 to fit the 10 x 15 8-lug wheels that came off my '69 Power Wagon when I wrecked it. Just had to grind the ridge/casting seam some along the radius.
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One more.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Yes, they can be ground a little. The problem is the definition of "a little". NObody really knows the thickness that remains, nor how much really "should" remain before strength is affected. One guy's approach may never cause a failure, but I'm not willing to be the "other guy" that goes veering hard left or right in a panic stop because my caliper housing just got overstressed and cracked. In other words, I doubt GM left a ton of extra material on there just to make it pretty, they are purpose built, and while it probably can be done without sacrificing overall integrity of the caliper - there's really no way to know if it has been sacrificed, unless it fails. Grinding off 2mm may not sound like a lot, unless the thickness there is already minimized to save weight - and that little 2mm of grinding now make sthe caliper susceptible to crack propagation. It comes down to a personal decision. You'll find a lot of folks aren't wanting to accept that unknown risk and that's why K5/10 wheels are at a premium. Don't get me wrong, I'm not saying it's wrong to grind a caliper housing, but it's one of those eyes wide open decisions someone has to make based on their own personal comfort level. It exceeds mine personally. In your case Tim, I'd agree, a casting seam probably has zero effect on part integrity. If min cross-sectional thickness in the area of the grinding is affected at all, that's when I'd start to have concerns personally.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I won't be grinding on them. I'm currently looking for the correct wheels.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I figure GM puts a little extra fat on as liability insurance. Their quality is a good bit higher than 'just enough'. It all depends on how much is needed off. Grinding a little off isn't going to cause some catastrophic failure. If it's along the radius in the center, that is high from being at the casting seam. I'm curious to know the details.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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Start by looking for "witness" marks where the wheel rubs.
Its probably in the Red. But the Green may rub as well. Look close for where its hitting then grind there. there is NO fluid running through this part of the caliper so you are good to grind a bit away. |
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I run 6" 6 lug up front and 8" 6 lug on the rear. I like that look. I found 4-4 nub 6" just in case I decide to up grade to disc brakes. Those 71&up 6" 6-bolt rims are out there and fairly cheap.
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Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
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you might give these guys a call - no guarantee they have em in stock (lots of things they list aren't in stock), but they do still list 6" wide 6 lug on 5.5 bc 71+ wheels. They do exist, I've been to their warehouse when I lived in CA - for hubcaps. But they do wheels too. Worth a call.
https://www.originalwheels.com/chevr...0rims-1972.php |
Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
Thanks guys, very good info. If I can't find them locally I've found them online for around
$50 rash with free shipping, believe it or not. |
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Tks Chris |
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I know everything is different but I had a similar problem running some Pontiac rally's on my GTO years ago and made some 3/8" spacer plates to move the wheel out so it cleared. That set of wheels got moved to my S10 and the same plates used. By now the wheels and plates have about 250k on them with no problems. The plates cost me $60 to have them made by a local machine shop to be an exact fit on the hub.
I stacked washers on the lug nuts until I got clearance to determine how thick of a spacer I needed. |
Re: Stock 6" 3 nub wheels on 12" CPP disc brakes?
I would check your local auto salvage place for a mid 70's 4WD K10 truck. I got a set of 4 for $50.
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Over the Christmas holidays I did install 6 lug disc brakes. The 71-up 6”rims fit flawless. A quick blast and paint and nobody would know there has been an upgrade done.
http://67-72chevytrucks.com/vboard/a...1&d=1579303249 |
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