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    Thread: Drilling Wheels (widening lug holes)

    1. Member Cherb32's Avatar
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      02-15-2010 09:52 PM #1
      Ok Ive been hearing mixed answers about drilling rims.

      I have a set of aluminum rims and I need the lug holes in them widened. I do not need new holes drilled. So people have said to just go ahead and buy a bit and use a household drill while others have said to take it into a shop and have them widened...
      Reason is because I have a set of wobble bolts and the lug holes are smaller than the bolts.

      So what is the real answer? Can I really use a bit (thats bigger than the lug hole) to make the holes slightly wider? Or will the rims end up cracking if I go with that option?
      Im not a noob with handling tools but im no mechanical engineer.

      Quote Originally Posted by bryangb View Post
      I'm usually too busy reaching for another beer to pay attention to other cars on the road

    2. 02-16-2010 10:39 AM #2
      so your wheel lug holes are 12mm and you need them 10 14mm?

      i drilled out a set of aluminum wheels not too long ago from1 2-14mm. really easy. I used a stepped drill


    3. 03-02-2010 03:07 PM #3
      would the holes have to be drilled to 16mm in order to have play?
      here's a picture I took from raderwerks.

    4. 03-02-2010 03:10 PM #4
      yah a little. i think i drilled mine to 5/8" (which is 15.875mm) just because thats the drop in the bit i used.


    5. 03-02-2010 03:15 PM #5
      Now when you use the stepped bit, will it automatically center with the existing hole?

    6. 03-02-2010 03:27 PM #6
      yeah i worked perfect for mine.

      was going to make a sort of jig for it but just kept the drill perpendicular to the wheel.


    7. 03-02-2010 04:53 PM #7
      okay so i am going to buy a step bit this week.
      is the furthest step on the bit have to be 5/8"?

    8. 03-02-2010 04:59 PM #8
      no youll want the last step to be larger than that, like the middle bit.

    9. 03-02-2010 05:38 PM #9
      so do you think I am safe to get a 7/8"?
      and when I drill i obviously don't go all the way through?

    10. Member ALLROAD VR's Avatar
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      04-29-2010 12:03 AM #10
      Quote, originally posted by audi666 »
      so your wheel lug holes are 12mm and you need them 10 14mm?

      i drilled out a set of aluminum wheels not too long ago from1 2-14mm. really easy. I used a stepped drill

      I'm doing the same thing. The bolts holes are only 12mm, I need to get them bigger so I could put 14mm wheel bolts that are NON wobble bolts.

      What size of step bit should I take? Are step bit better than regular bits? Should I use drilling lubrication when I drill?

      Haters gonna hate.

    11. Junior Member PiMPMAN101's Avatar
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      05-20-2010 02:06 PM #11
      Does anyone have an answer for this guys questions? I just got some AMG wheels and the bolt holes are 12mm but my Audi bolts are 14mm.

    12. 05-21-2010 09:54 AM #12
      id love an answer too.....or else they are going to the rim shop to get done....

    13. Member DrivenAllDay's Avatar
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      05-23-2010 11:42 AM #13
      anymore info on this topic, I will be running (PCD variation bolts)

      Are most people running 5x114.3 wheels just using bit's and doing it themselves.

      I will need this done soon.

    14. Junior Member PiMPMAN101's Avatar
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      05-24-2010 03:58 PM #14
      Okay, I figured it out and made mine work. It costs about $73 or so for the drill bits and lube. This will let your Mercedes wheels that have 12mm lug holes accept 14mm Audi/VW lugs.

      **I don't know if this method will work for other wheels or not!!

      What you will need:
      9/16" steel drill bit
      3 Pack of stepped drill bits (the ones pictured above)
      Bottle of drilling lube

      Assuming you have these:
      3/8" drive drill
      1/4" drive drill

      You will only use the fat stepped drill bit. What you are doing is starting the hole then then use the drill bit to drill all the way through. It takes about 30 minutes, but once your done you can enjoy your new wheels on your car!
      Last edited by PiMPMAN101; 05-24-2010 at 04:03 PM.

    15. 05-24-2010 05:38 PM #15
      Don't you also need to machine the bolt seats to the spec's of the larger bolts?

    16. Member flushb5's Avatar
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      11-06-2010 12:09 PM #16
      Quote Originally Posted by audi666 View Post
      so your wheel lug holes are 12mm and you need them 10 14mm?

      i drilled out a set of aluminum wheels not too long ago from1 2-14mm. really easy. I used a stepped drill

      Did you just use that center bit and go all the way through with it? What size do I need, putting monoblocks on a b5 a4. Sorry for bumping an old thread. Do I need to widen the seat for the lug bolt to sit on or is the taper of it still enough to occupy the 14mm bolt?
      EastCoastStrong

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      02-25-2011 09:04 PM #17
      bumping this from the grave.

      I'd like to know some answers on how this is done. Might be trying it soon on some AMG Monoblock Aero2's.

      TIA.

    18. Member
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      02-27-2011 02:32 PM #18
      i did it to benz wheels for my b5 the wheels sre fine i used a drill bit that was a little bigger just do it they should be fine my wheeels are no cracks just drill it straight its a 2 person job

    19. Junior Member
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      02-27-2011 03:12 PM #19
      Alright. Well I might be trying this soon then. And hopefully I'll make it right and then do up a DIY it if gets done.

    20. Member VW-Pssst's Avatar
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      03-22-2011 03:46 PM #20
      status on this?
      Quote Originally Posted by Village Idiot™ View Post
      When there's a female involved, logic tends to go out the window.

    21. Member naterkane's Avatar
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      08-24-2011 12:52 AM #21
      i was thrilled when i came across this thread, then i realized that my MB wheels already took 14mm hardware no problem.

      go figure.
      Best,
      Nater Kane
      Motörshed Inc

    22. Member cldub's Avatar
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      05-07-2012 05:47 PM #22
      Super bump. I need to figure this out for my AMG monoblocks!

    23. Member FLMKVDUB's Avatar
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      05-07-2012 06:59 PM #23
      Quote Originally Posted by cldub View Post
      Super bump. I need to figure this out for my AMG monoblocks!
      Just use the appropiate size bit and follow this:



      Or just take it to a machine shop. I paid $140 to have mine drilled from 12mm to 16mm and enlarge the seats.

    24. Member cldub's Avatar
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      05-07-2012 09:18 PM #24
      Quote Originally Posted by FLMKVDUB View Post
      Just use the appropiate size bit and follow this:



      Or just take it to a machine shop. I paid $140 to have mine drilled from 12mm to 16mm and enlarge the seats.
      Thanks I found this video shortly after I posted

    25. Member toplessvw's Avatar
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      05-07-2012 10:06 PM #25
      the way that video does this jobn simply stupid, and a waste of time. Using a countersink bit to drill a hole bit is the dumbest thing I have ever seen. A drill bit will self center in the whole leaving you with a whole in the right spot. Buy two high quality hss drill bits and do each hole in two steps 15mm then 16mm and then take a larger countersink tool and enlarge the seat a bit if you feel the need to, just make sure the counter sink matches the angle of the cone seat.

      btw this is how a machine shop would do it
      Last edited by toplessvw; 05-07-2012 at 10:08 PM.

    26. Member naterkane's Avatar
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      05-08-2012 01:49 AM #26
      Quote Originally Posted by toplessvw View Post
      the way that video does this jobn simply stupid, and a waste of time. Using a countersink bit to drill a hole bit is the dumbest thing I have ever seen. A drill bit will self center in the whole leaving you with a whole in the right spot. Buy two high quality hss drill bits and do each hole in two steps 15mm then 16mm and then take a larger countersink tool and enlarge the seat a bit if you feel the need to, just make sure the counter sink matches the angle of the cone seat.

      btw this is how a machine shop would do it
      Sorry, I can't help it... but the word is hole, not whole.

      Best,
      Nater Kane
      Best,
      Nater Kane
      Motörshed Inc

    27. Member cldub's Avatar
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      05-08-2012 08:23 AM #27
      Quote Originally Posted by toplessvw View Post
      the way that video does this jobn simply stupid, and a waste of time. Using a countersink bit to drill a hole bit is the dumbest thing I have ever seen. A drill bit will self center in the whole leaving you with a whole in the right spot. Buy two high quality hss drill bits and do each hole in two steps 15mm then 16mm and then take a larger countersink tool and enlarge the seat a bit if you feel the need to, just make sure the counter sink matches the angle of the cone seat.

      btw this is how a machine shop would do it
      Thanks!

    28. Member toplessvw's Avatar
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      05-09-2012 11:49 PM #28
      Quote Originally Posted by naterkane View Post
      Sorry, I can't help it... but the word is hole, not whole.

      Best,
      Nater Kane
      nice catch guess I should proof read,just get lazy when I post from my phone. Rereading it now I should have read what I wrote before I hit submit

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