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09.16.2007, 02:56 AM
Go with the 1y. The 2.5D is a less powerful motor, meaning it will struggle more the reach the same speed. The 1y will only overheat more if it is underloaded. In such case, it would be better to go down to a 1512, instead of requiring the biggest pinion gear you can find to get your desired speed, so in my mind a 1515 2.5D isn't much of an option.
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