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Thread: grinding center bore on rims??

  1. #1
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    grinding center bore on rims??

    does anyone see an issue with grinding out the center bore on a set of rims? i have a set with 67.1mm bore and require 71.5mm. i figure a couple round trips with a die grinder would do the trick. As long as i dont get carried away there shouldn't be too much of an issue i dont think. will that 4.4mm weaken the center of the rim too much? Its on the DD, got a killer deal on winter rims and tires, never checked the bore diameter though! doh!!
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    if only i could find a lathe big enough so i could keep the tires on.

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    I would not recommend that you do it by hand... It will cause vibrations unless you get it perfect. I'm not saying it cant be done but you will need to do it on a lathe or a CNC mill.
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    i had my center bore machined out for my wheels on my Dually by a company we deal with here in Brantford. do NOT grind the center bore have them machined properly.
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    ^^ agreed. May be worth the hassel to have them machined by a rim shop if they will see road use.

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    I ve used a plasma cutter to make the centers of some chev rims fit a toyota... Center didn`t matter much because the rims were lugcentric on these.... No vibrations or any issue...

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    I see no issue as long as they are lugcentric
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    As said already, You shouldn't do this with a grinder of any kind...

    But if you do the only problem you will have is if you ever want to balance them on a regular wheel balancer, because you will not grind out the center perfectly round...

    When the rim goes on the balancer it will not be properly centered which will not allow it to be properly balanced...
    And that is the only real balancing issue you will have that I can see...
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    ^ if you run large tires you ll probably want to run with balancing beads anyhow....Just saying!

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    this is the DD. just wana put on snows. got a good deal on rims and tires. i figured the lugs did the bulk of the centering anyways.

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    well you d be right about the lugs doing the centering.. however if they are gonna be balanced by a traditional balancer.. jeepman is right. Balance them and then grind the center if you re only gonna use them for winter tires this year.

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    i agree 100% with Jeepman. with "lugcenteric" comment at the end of the day the wheel WILL be out of balance due to the fact that you can NEVER GRIND a perfectly round hole. this is why wheels come from the factory with the proper center diameter and they are all done by machine. and people wonder why the custom vehicle industry gets a bad name its because of this. people thinking that they can reinvent the wheel.... if you where just goin to grind the centers out anyways why did u start this thread? just let us all know where u work and what roads u drive and the times because the last hting i need is an inbalanced wheel flying at me after it comes off of the vehicle you are driving. now if it was for OFF ROAD use only and will be being trailered to the spot then sure i can see the grinding the center but a daily driver??????? just my 2 cents.......

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    WOW sore spot was hit this morning! Dont recall saying anything about custom vehicle industry??or that i WAS going to grind them? simply asked a question? got a couple of different responses. I guess instead of digging deeper into the question at hand i should simply follow your advice blindly and ignore anyone else!:confused: I suggest decaf!

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    I suggest decaf!
    ---> lol

    i hand reamed the centre of some ford alloys to fit on the front hubs of my sidekick.... balanced them after the fact, and drove highway/city/offroad for a year and put 30 000 kms on them running 31's. NO ISSUES!!!

    just saying what i did and that it worked. maybe i am really good at cuttin holes? maybe i got lucky? maybe im ignorant.... haha but the truck is sold and still running that setup on the road 2 years later...

    i think the balance first then cut would be the absolute best method without paying to get them machined though.... good luck!
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    oh and the highway miles were from north bay to niagara... not just on and off the highway for a moment... in otherwords many many 800km return highway trips. just sayin

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    Grind the unit bearings

  17. #17
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    Quote Originally Posted by biohazard View Post
    grinding out the center bore on a set of rims?
    not to stir the pot, but I think this is why folks thought you were grinding.

  18. #18
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    I suspect i may need to grind the center to fit my H2 rims over the 14 bolt hub. Probably use a grinder. Got my fingers crossed. I'll be driving on the road. Watch out for incoming 42's
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    this will proberly be the weridest idea yet. so brace yourself...
    is it possiable to get the proper rims, its crazy i know but i belive with the right tooling and knowhow it can be done....
    just kidding eh.

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    Quote Originally Posted by Reverage View Post
    Grind the unit bearings
    lmfao x2

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