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Holes On Your Carbon
There are four different types of holes drilled on carbon rims. The quality of the holes is important because it
can affect force transmission, wheel tension, and ease of building. Smooth hole drilling is a striking feature
of our rims since the detailing process is done carefully and we even use the aviation-class drill bits on Pro
rims. Take a minute to learn about the hole function and types, and consider whether you need customized
diameters on your next Light Bicycle purchase.
Spoke Access Holes: Easy Spoke Lacing
Access holes are drilled into the rim bed/center channel to feed the nipple through the rim to connect with the
spokes. Wheel building can also be done from the wheel’s outside diameter if set up with the correct hole type.
We drill centered, offset, or staggered hole patterns depending on the rim type.
Some customers prefer to go without these hole patterns. With this style of tubeless rim, tubeless tape isn’t
necessary, but it makes wheel building more challenging. Check out our blog on
and tubeless rims.
Nipple Holes: Internal or External?
Are internal (hidden) nipples better? The internal nipple is built into smaller holes of a 2.5mm diameter, thus
fewer carbon fibers are drilled and interrupted, and the holes are less likely to crack. The area around the
external nipple hole (Ø4.5mm) is reinforced, so the increased rim strength isn’t obvious. Internal nipples are
also thought to be more aerodynamic than external nipples. The maintenance of internal nipples, however, is
challenging. When truing the wheel, the tire and rim tape (if applicable) must be removed to adjust the nipples.
There are two tips we suggest for internal nipples: one, use them for deep rims - over 25mm in depth; two, don’t
pair internal nipples with tubeless rims - this could drive a wheelbuilder crazy.
What’s more, the nipple hole is drilled on an angle according to the hub flange. This allows the nipple to pull
straight in line with the spoke for reduced stress. The result? Fewer broken spokes and nipples.
Valve Holes: Presta vs Schrader
Presta valves have a 6.5mm valve diameter and are the most popular for mountain bike, road and fat rims.
This is our default valve hole size on all rims. If you want to go tubeless, we suggest the Presta valve
instead of Schrader.
We can make 8.5mm Schrader valve holes which is the same style of valve used for vehicle tires. These are
more popular with BMX riders. If you want to run Schrader tubes or valves, please make a note at
and we will customize the valve hole diameter for you.
Drain Holes: Evacuate Water
Some rims on the market come with a drain hole which is often located 90°/180° to the valve. These holes are designed
to evacuate water using the centrifugal force of the wheels. Though not necessary, the 2.5mm holes can help to
reduce the amount of water that can potentially accumulate inside the rim while riding. We do not add these
holes as a standard, but if you make a note when ordering, we can reinforce the area and add two of these holes
Please leave a comment if you have any questions on our hole drilling customization service.
I am planning to order VELO plugs to convert my tubeless R25 tubeless wheelset to clincher setup. Would like to use the VELO plugs but need to know the hole diameter in these rims since they come in 2 sizes. Sharing description of what’s mentioned on the site.
"The VeloPlugs is available in two sizes, suitable for two different diameter of the rim holes. The red VeloPlugs fit into 8 mm rim holes. The yellow VeloPlugs fit into many system wheels with spoke holes 8,5 to 9,2mm, the gluing is no longer required. "
Thanks & Regards,
The diameter of spoke access hole is 8mm. Let me know how the plugs work out for you. They seemed not as air tight guaranteed as rim tapes.
We have no hole options available now. So you can order that next time. Then you will not have to use plugs to cover holes on these 700C wheels.
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