Wheel stud length with Rambler wheels - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sgreenwalt25 · 08-14-2019, 10:36 PM

This seems to be a common question, but I can’t seem to find an answer. I have converted my 70 c15 12 bolt to 5 lug axles. I plan on using a CPP rear disc brake conversion kit (either standard or big brake kit). I also plan on going with us mag rambler 20” wheels...I can’t seem to find any references to wheel stud length for this application. I would like to put the axles in and seal the rear end up, but want to make sure I have long enough studs. I have installed 1/2x20 - 1.5” studs but not sure they are long enough. Anyone who has used CPP rear brake kits and rambler wheels that may have some input is much appreciated. Thanks.
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**bigmac73** · 08-15-2019, 07:22 AM

I would think that the stock length should be fine as the thickness of the new rotor installed would be the same or a little thinner that the drum that was used before. so the dimensions should not change

68Stepbed · 08-15-2019, 08:15 AM

I have 18" Ramblers with the CaptainFab disc brake setup using Astro Van rotors. I still have the stock lug studs, and there's still plenty for the lugnuts to grab onto. If it's an issue, you could always use the longer reach lugnuts.

**HO455** · 08-15-2019, 08:46 AM

The rule of thumb for stud length as per the NHRA is: The stud must extend past the lugnut seat on the wheel not less than the diameter of the stud i.e. a 1/2" stud must be proud of the seat 1/2".
So measure how thick your wheel flange is and add the diameter of the stud.

**MySons68C20** · 08-15-2019, 12:02 PM

When I did my conversion I had the same concern. The stock lengths work perfect with my rambler wheels.

siggyfreud · 08-15-2019, 12:58 PM

And for what it's worth I was able to change studs on my disc brake conversion without having to open up the rear. So if you do find you need something longer you should be able to install them after the fact.

sgreenwalt25 · 08-15-2019, 04:20 PM

All - Thanks for the info. I assume when everyone is referring to stock length, they mean 1 1/2 studs?

I haven't bought the brake kit or the wheels yet which is why I am unsure. House projects come first before winter...

Can the brackets for the CPP rear calipers be installed without removing the axles?

**bigmac73** · 08-16-2019, 09:03 AM

you have to remove the old backing plates, in order to do that the shafts have to come out unless you just cut them off. But i would try to save them as some other member might need them in the future.

08-14-2019, 10:36 PM	#1
sgreenwalt25 Registered User Join Date: Feb 2019 Location: KCMO Posts: 2	Wheel stud length with Rambler wheels This seems to be a common question, but I can’t seem to find an answer. I have converted my 70 c15 12 bolt to 5 lug axles. I plan on using a CPP rear disc brake conversion kit (either standard or big brake kit). I also plan on going with us mag rambler 20” wheels...I can’t seem to find any references to wheel stud length for this application. I would like to put the axles in and seal the rear end up, but want to make sure I have long enough studs. I have installed 1/2x20 - 1.5” studs but not sure they are long enough. Anyone who has used CPP rear brake kits and rambler wheels that may have some input is much appreciated. Thanks. Posted via Mobile Device

08-15-2019, 07:22 AM	#2
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Wheel stud length with Rambler wheels I would think that the stock length should be fine as the thickness of the new rotor installed would be the same or a little thinner that the drum that was used before. so the dimensions should not change __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

08-15-2019, 08:15 AM	#3
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Wheel stud length with Rambler wheels I have 18" Ramblers with the CaptainFab disc brake setup using Astro Van rotors. I still have the stock lug studs, and there's still plenty for the lugnuts to grab onto. If it's an issue, you could always use the longer reach lugnuts. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

08-15-2019, 08:46 AM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,786	Re: Wheel stud length with Rambler wheels The rule of thumb for stud length as per the NHRA is: The stud must extend past the lugnut seat on the wheel not less than the diameter of the stud i.e. a 1/2" stud must be proud of the seat 1/2". So measure how thick your wheel flange is and add the diameter of the stud. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

08-15-2019, 12:02 PM	#5
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 897	Re: Wheel stud length with Rambler wheels When I did my conversion I had the same concern. The stock lengths work perfect with my rambler wheels.

08-15-2019, 12:58 PM	#6
siggyfreud Registered User Join Date: Jun 2012 Location: Portland Posts: 1,330	Re: Wheel stud length with Rambler wheels And for what it's worth I was able to change studs on my disc brake conversion without having to open up the rear. So if you do find you need something longer you should be able to install them after the fact. __________________ Current Build - Project "Ghost of Poseidon" 72 C10 Pro-touring build Previous Build - 66 GMC Pro-touring build. Sold.

08-15-2019, 04:20 PM	#7
sgreenwalt25 Registered User Join Date: Feb 2019 Location: KCMO Posts: 2	Re: Wheel stud length with Rambler wheels All - Thanks for the info. I assume when everyone is referring to stock length, they mean 1 1/2 studs? I haven't bought the brake kit or the wheels yet which is why I am unsure. House projects come first before winter... Can the brackets for the CPP rear calipers be installed without removing the axles?

08-16-2019, 09:03 AM	#8
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Wheel stud length with Rambler wheels you have to remove the old backing plates, in order to do that the shafts have to come out unless you just cut them off. But i would try to save them as some other member might need them in the future. __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks



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