240mm levers are handy to carry around with you, but at home I use 350mm (16") levers. The longer ones are probably better for a first-timer, but it's more about technique than brute force.

These are what I use:

http://www.derbyshireoffroadcentre.c...mart&Itemid=57

There is a similar size Motion-Pro tyre lever:

http://www.adventure-spec.com/defaul...yre-lever.html

Some protectors might be handy if you're precious about your rims?

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