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Old 11-14-09, 09:37 PM   #1
yerodtr
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Modify presta only wheel for schrader?

So my question is. I have WTB LaserDisc Trail wheels on my Trance. Apparently they will only accommodate tubes with presta style valve stems.

I am OK with this except I have several right sized schader style tubes already and two other bikes here that use schrader as well. It would be nice to have all three bikes on the same platform of tubes.

I'm not suggesting I hack up my wheels with reckless abandon but the curious thing to me is that in looking at the inside of my wheel today (which I was so lucky to do midway through the hardest trail in the park due to a pinch flat) I noticed that the initial opening inside the wheel is large enough to accommodate a schader tube but the opening leading to the "outside" of the rim is presta only.

So my question is, would it be semi-sane to drill out the "outside" opening to the same diameter as the "inside" opening? Pics below show the two different sized openings. I'm guessing it's a bad idea but it sure would be nice to be all schader (don't have to use adapters, only have to carry one type tube in camelbak, etc).

What does everyone think?


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Old 11-14-09, 09:40 PM   #2
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Drill away.
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Old 11-14-09, 09:47 PM   #3
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Drill baby drill!
Many folks have done that. Make sure there are no burrs when done drilling.
If so, use a small round file.
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Old 11-14-09, 10:12 PM   #4
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Yes...drill...with vigor.
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Old 11-14-09, 10:19 PM   #5
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Drill and deburr... it only takes a few seconds.

Going back to a Presta will require an adapter and the hole needs to be the right size to use that so be exact with your choice in bits.
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Old 11-14-09, 10:27 PM   #6
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Get a pump that works with both types of valves.
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Old 11-14-09, 11:10 PM   #7
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i do it all the time. i want to say i use an 11/32ths drill bit...

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Old 11-14-09, 11:14 PM   #8
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Get a pump that works with both types of valves.
+1 this is what i have.
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Old 11-15-09, 07:28 AM   #9
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Thanks for the input/confirmation!

Two things.

1 - My only concern is about the support "post" as seen in picture number two and how I will be hitting that guy during the drilling process. Do you see that being a problem?

2 - Is there a distinct advantage in using presta style tubes over schrader?

Thanks again for your help.
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Old 11-15-09, 08:13 AM   #10
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Quote:
Originally Posted by yerodtr View Post
Thanks for the input/confirmation!

Two things.

1 - My only concern is about the support "post" as seen in picture number two and how I will be hitting that guy during the drilling process. Do you see that being a problem?

2 - Is there a distinct advantage in using presta style tubes over schrader?

Thanks again for your help.
1) not sure what you're referring to. i confirmed 11/32 works well, that is the size i use. just do it. it's not that much larger, should not hit anything. drill straight down from the tire side approach with a new bit. it will go easily.

2) i prefer schrader. i remove the valve core and usually put a couple ounces of stans sealant inside and replace core. i have had tremendous success doing this with many XC races, 24hr races, and desert riding. i tend to use reg to thinner tube...but never heavy duty. i don't weigh that much, but i run pressures approaching that of tubeless set-ups. you can also put sealant in the presta, but a little more pain to do. i put a little in my road bike tubes.

i have also drilled rims that were fairly narrow and light made for xc type use. i never had the feeling that i compromised the integrity of the rim. it removes very little material with the 11/32 bit.

mx
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Old 11-15-09, 07:24 PM   #11
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In the second pic there is a "V" shaped support that spans the distance between the inner and outer part of the rim. I assume it goes throughout the length of the rim and isn't just located by the valve stem hole. Hitting that while drilling was my concern.
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Old 11-15-09, 08:11 PM   #12
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Quote:
Originally Posted by yerodtr View Post
In the second pic there is a "V" shaped support that spans the distance between the inner and outer part of the rim. I assume it goes throughout the length of the rim and isn't just located by the valve stem hole. Hitting that while drilling was my concern.
i see it now. no problems at all, just drill the f ' er!

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