Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It was alright untill...

The bike arrived completely fine. While assembling it i had to go buy a wrench that i didn't have and the tires did not have the required pressure so i went out to buy a bike air pump.After the assembling was finished (the instructions are not that great, specially the part that involves setting up the brakes for the front wheel)i started to ride the bikeAfter thirty minutes of use, a part of the gear that holds the chain broke off...I have now returned the bike to amazon and i am waiting for a refundAccording to the reviews here the bike is pretty good, so i am sure i just got unluckyI went out to a retail store and bought a daimondback mountain bike instead together with a two year warranty so i do not have to worry about the bike breaking down on me again...