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What size drill bit for presta rims to make them schrader?

Discussion in 'Downhill & Freeride' started by Spunger, Dec 16, 2005.

  1. Spunger

    Spunger Git yer dumb questions here

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    I looked everywhere and the last time I did this the holes came out way too big. I was told to use a 21/64 bit which isn't in any kit of drill bits I have. I'll go by Sears later and see if they have just that one single bit in a package.

    But what size do most use? I have a set of singletracks that are presta drilled but I'd like them to be Schrader as I got a boatload of schrader tubes. It just seems like it'd be easier to do.

    Any help would be great :)
     

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  2. dropmachine

    dropmachine Turbo Monkey

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    I always just try to compare the tail of the bit to the valve, and drill away. If it doesnt' fit, go one size bigger. Takes 2 seconds to do, and you're done.

    DOn't forget to deburr the edges.
     
  3. nmjb

    nmjb Monkey

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    I've done it this way a few times, it has always worked great.
     
  4. Zutroy

    Zutroy Turbo Monkey

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    Becareful about getting metal flakes into the rim too, can be a pain in the rear to get them out, oiling it a far amount will help catch them.
     
  5. Dartman

    Dartman Old Bastard Mike

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    It's 21/64"s and you can get one at ACE hardware for about $2.

    Didn't worry about metal flakes either. Just drilled 'em out and rode. No problems.

    Mike
     
  6. Jimmy_Pop

    Jimmy_Pop Turbo Monkey

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    unibit

     
  7. BigMike

    BigMike BrokenbikeMike

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    Those things are a bit expensive to just drill out rims......
     
  8. ioscope

    ioscope Turbo Monkey

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    they also wouldn't work
     
  9. Jimmy_Pop

    Jimmy_Pop Turbo Monkey

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    This is how adults develope a tool collection.
     
  10. BigMike

    BigMike BrokenbikeMike

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    This is how adults spell develop ;)


    I prefer my full set of drill bits to a unibit :)
     
  11. Jimmy_Pop

    Jimmy_Pop Turbo Monkey

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    A$S, im takin' my 'bit and playing elsewhere, lol;)
     
  12. Spunger

    Spunger Git yer dumb questions here

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    Those step'drill bits are great for fabbing things up but for precise things nothing beats a normal size bit.

    I'll just go check out sears and see what I can find :)
     
  13. nh dude

    nh dude Monkey

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    its three eigths" bit and they are available everywhere
     
  14. in the trees

    in the trees Turbo Monkey

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    I've always used an 11/32" bit and it works just fine. I got this info from a Nashbar catalog ages ago when I first started mtn. biking.

    toby
     
  15. dropmachine

    dropmachine Turbo Monkey

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    This thread is funny. Its almost like "how many licks does it take to get to the middle of a Tootsie pop" but instead its "how many posts does it take to make a friggen hole bigger?"


    Its a freakin hole in a rim.
     
  16. Spunger

    Spunger Git yer dumb questions here

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    I know it is :) But I don't want some giant hole in my rim, it'd be nice to get close to the right size. I picked up a 21/64 bit which hopefully drills a hole just the right size. I asked because it's not like schrader valves have changed in size over the years.