If you're using deep or aerodynamic wheels, you'll probably need valve extenders - here's our guide to fitting and using them. Important to get right, frustrating if you get it wrong.
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There are two types of valve extenders; those that require you to remove the valve core and those that don't.

To fit both types you'll need some silicone (plumber's) tape, a set of small pliers and it's also a good idea to have some insulating tape to hand.

The important thing is to make the seal as air-tight as possible, hence the silicone tape. Deep section wheels are also really prone to the valve rattling. So, get some insulating tape and wrap it around the valve at the point that it exits the rim.

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