Seat post clamp+a wheel question

Helen1
Helen1 Posts: 20
edited May 2008 in MTB buying advice
Hi, I would like replace my existing clamp with a quick release - only I'm sure not what size!
Where/how do I measure ?

Also can I use wheels that have disc mounts, but continue to use v brakes?

Sorry to be such a roadie numpty!!

Thanks!

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