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drilling out 321's

Aug. 18, 2006, 5:29 p.m.
Posts: 2154
Joined: Jan. 10, 2003

My old 321s developed small cracks at the valve hole after being drilled out for shrader. To be honest it never really affected anything though, I still rode the rims without problems for a couple seasons until that bike got stolen. That being said if I had a new set of those rims I wouldn't do it. What's wrong with presta?

On a related note, the new 729s come shrader drilled with a plastic adapter for presta. These don't seem to crack and I think it's for the reason LIPS stated.

Aug. 18, 2006, 6:05 p.m.
Posts: 6024
Joined: Dec. 17, 2002

i drilled out several d321's, who ever told ya that youd have problems is a knob. how do you think the original hole got there?
watch your drill speed and use coolant/cutting fluid. dont drill like a hack and you'll be fine.

Aug. 18, 2006, 10:31 p.m.
Posts: 2430
Joined: Oct. 23, 2004

Just drill it out. Its not brain surgery. I've done it alot, even XC rims back in the day. Never, never a problem after. Just make sure you use a little emery cloth to take the burrs off after.

.

Aug. 18, 2006, 10:35 p.m.
Posts: 12390
Joined: Nov. 22, 2002

Yes it will work no prob. A 21/64" Drill bit from the hardware store is the legit size. 5/16" works though.

Aug. 18, 2006, 11:28 p.m.
Posts: 11203
Joined: Nov. 18, 2004

Its perfectly fine. I mean, how do you think that hole got there in the first place?

Aug. 19, 2006, 12:16 a.m.
Posts: 33665
Joined: Nov. 19, 2002

How do you think the first hole got there?

:lol:
You've been mimed alot on that statement.

I've used a file to make the hole bigger. Didn't have a problem.

It is easy to dodge our responsibilities, but we cannot dodge the consequences of dodging our responsibilities.
- Josiah Stamp

Every time I see an adult on a bicycle, I no longer despair for the future of the human race.
- H.G. Wells

Aug. 19, 2006, 12:50 a.m.
Posts: 1489
Joined: Dec. 19, 2002

I mean, how do you think that hole got there in the first place?

i thought mavic laser cuts those holes. :deadhorse:

:high: :.:.:.:.:.:.:.:.:.:.:.: :high:

Aug. 19, 2006, 1:06 p.m.
Posts: 5731
Joined: June 24, 2003

Hang on a minute. Since when did Mavic need to be drilled for schraeder? Every Mavic rim I have had in recent memmory came with a schraeder sized hole and a plastic grommet for presta use?

But if not drill or ream or round file a larger hole. Won't harm the rim.

Debate? Bikes are made for riding not pushing.

Aug. 19, 2006, 8:27 p.m.
Posts: 18059
Joined: Nov. 19, 2002

i believe the OP is referring to an older rim. my mavic is about 3 yrs old and had to be drilled out

Aug. 20, 2006, 5:10 a.m.
Posts: 2720
Joined: Nov. 22, 2002

ive drilled out mine…

no problem

i ddint even use the right drill bit, a smaller one and reamed it out a bit by drilling on angles…

works fine…

its not exactrly rocket surgery to drill out a rim, cant see why it would crack…

Aug. 20, 2006, 9:27 a.m.
Posts: 10387
Joined: Dec. 19, 1977

its a fricking bicycle, not the space shuttle. Go grab a cordless drill and do it. They make 321's with the larger hole, there is no difference. Drill it and give'er.

Aug. 20, 2006, 9:28 a.m.
Posts: 10387
Joined: Dec. 19, 1977

its not exactrly rocket surgery to drill out a rim, cant see why it would crack…

Are you talking "rocket science" or "brain surgery" here? :lol:

Aug. 20, 2006, 9:35 a.m.
Posts: 11203
Joined: Nov. 18, 2004

its a fricking bicycle, not the space shuttle. Go grab a cordless drill and do it. They make 321's with the larger hole, there is no difference. Drill it and give'er.

Yes! You always say what I want to say!

Aug. 20, 2006, 12:05 p.m.
Posts: 776
Joined: July 8, 2005

Simon, I feel pretty confident in saying, yes, you should drill them out.

Buy my damn bike.

Aug. 20, 2006, 5:26 p.m.
Posts: 4924
Joined: July 10, 2004

the easiest way is to go to you bike store and buy a shraeder adapter for all of one dollar and continue running presta tubes.

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