Despite shedding 15kg, blogger Cameron Slater, also known as Whaleoil, could not match Labour MP Trevor Mallard in a 60km bicycle race around Auckland's eastern suburbs yesterday.

"I finished the challenge. Unfortunately I finished second behind Trevor Mallard," Slater wrote on his blog.

"Never mind. I am fit, have lost weight and what is abundantly clear is that Trevor Mallard has spent three months training his arse off to make sure he didn't lose a bike race against a fat blogger."

The MP made the challenge after the blogger called him a "cripple" when he broke his right leg and shoulder blade in a crash in Otago five months ago.

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Mr Mallard lashed back, calling Mr Slater "blubber boy".

Labour list MP Darien Fenton was the first to congratulate Mr Mallard on his Facebook page: "You did it Trev! Well done."