It's rediculous to think 17.5 is too slow. It runs equivalent to all the old 27t motors were all used to racing. Your an idiot if you think 13.5 is equivalent to 27t. We all know 13.5 runs faster with the 19t. I've never seen a brushed 19t beat a 13.5 yet, so actually there's a lot of people thinking they are equivalent to like a 17t motor. This may be true. The old days of brushed motors and they're maintenance are almost a thing of the past. Weird isn't it.