screw-on MQQN discs

so, I've had Moon discs before but they were old-style 'snap on' that clamped to the rim. Thinking about putting some screw-on style and I'm not sure about drilling holes - take the tires off first? or just be cautious with depth being mindful of tearing up the cords in the tire beads. Any input on procedure would be gratefully accepted.

dj

 

It may not have been the right way to do it but I used the self tapping screws to drill the holes in the rims(with the tires on), stopped as soon as it made it through the rim, backed them out and ground the tips off, put some silicone on the screws and threaded them back in. I never had a problem with them.

 

I've never done them, but if I was I'd use some el-cheapo drill stops like they sell at Horrible Fright for $2. You put them over your bit, adjust, and then tighten with an allen wrench... then you won't have to worry about going to far. You could just wrap tape around the bit, but that's not as cool as buying another tool.

 

You can do it with the tire on! Like said just have a drill stop or put tape on the drill and put a dab of silicon on the disk itself and let it dry before you put it on they tend to rattle no matter how tight you got the screws

 

That's great I have been thinking of putting screw on disks on my 50 ply wagon but feared damaging the tires. Thanks guys....


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I've never run moon discs, but thinking about them for my next project.
What if a guy welded nuts to the rim with a clearance hole behind them to get full thread engagement. A 1/4" nut would hold the disc off the rim a 1/4", maybe stop the rattle. Would air get in behind and rip them off the wheel?

 

I've had the disc's on my 74 Ford E100 van for years. I'm sure you could go the quick route, but I visited my friendly discount tire store, trusty drill by my side. Had the tech's dismount the tires, drilled and tapped the wheels, had them remounted, installed silicone as suggested. Trouble free for years.

 

I've never done Moon discs, but I have drilled a few rims for slicks. I just drill them with the slicks mounted and run the screws through the rim and into the bead. They're a LOT bigger than the screws to mount wheel discs, and I never had a problem.

 

Drill, tap, machine screw, on-car, with tires. Success since the late 80's.

 

I've seen guys use trim rings. Drill the discs and screw them to the trim rings, Then pop them on like a regular wheel cover

 

The easiest way is to cut a length of tubing, about 3/16" ID, and slip it over the drill bit. Leave just enough of the bit sticking out to get through the rim. We did it that way in the early 60's and it's quick and easy.

 

Street Rodder did an article on using dzus fasteners for a real neat, stable system. There are kits out there.

 

I have run moon discs for about 20 years and 170,000 miles on my '56 Chevy panel. Wrapped a bit of masking tape around a drill bit as a guide. Did it with tire on. Actually, having run these so long, I have even redrilled holes in a different place because they stripped out. Left the old holes and never had any kind of problem. I have never used any sealant on the screws. The bead of that tire is pressed pretty hard against that rim. Not likely to leak.

 

I've had them on my Elco since the early 90's. Drilled them on the car (with tire on), they came with self tapping screws and never had a problem (with NO sealant). Thing to look out for, they will flex a little and take out your paint on the wheel, so I used a little duct tape on the backside and you have to take them off to check the tire pressure......so super low cars with low wheel well openings are fun.

 

I must be the only guy to have a problem with the screws that are provided from Moon. After having the caps on my truck for 4 yrs, I have recently had a not so slow leak on the bead around 2 of the drilled holes. Oh well, time for new tires and wheels anyway!

 

Thank you all very much for the answers. Very helpful, especially for those of you that have run them for so many years.

tnx
dwj

 

I think the screw on were the "old style", the snap on was newer.

Mine used to get loose and rattle, so I ran a bead of silicone around mine and let it dry. Acted like a gasket of sorts, worked well.

 

i do the same thing every summer

 

i ran the original type Moon disc that installed with screws,installed with the tires on the truck and used a small piece of rubber tubing over the drill bit to keep from penetrating the bead of the tire,,never any leaks.

They were on the truck for almost 10 years. HRP

 

How about zuse fasteners. (spelling)?

 

Dzus.

 

A dowel or a small scap of 3/8 or 1/2 square wood acts as a great drill stop.

Drill thru the dowel or square stock and cut to length leaving the length of drill protrubing you want.

 

"Old Style" moon disk are screw on not snap on. I recommend using Dzus fastners as sheet metal screws have a habit of whollowing out the hole after taking them on and off several times.