Question about Mongoose Butterfly Summer 12" Girl's Bike

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Childs 12 inch mongoose is new, but back wheel does not spin prop

I bought this bike new off internet for christmas present for 3 year old daughter, assembled it without difficulty, but back wheel does not spin freely. it is as if the coaster brake is applied or connections too tight to allow wheel to spin easily.

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The bikes are pre-assembled by a machine that overtightens the rear axle.  I had the same problem with my daugher's 12 inch huffy princess bike and my other duaghter's 16 inch Schwinn bike.  If you loosen the nuts on the back axle it fixes the problem.  I have read that the idea thing for these bike is to have them re-assembled and re-lubricated by a bike shop, but I thought this might cost as much as I paid for the bike. 

Posted on Jun 13, 2009


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