Yes I just realized the 40 meant the aspect ratio (sidewall length) and not the width of the tire. So this means that the tire is an even lower profile than the 50... yeah, I probably don't want that...!
If you go with the 40 series you lose alot of "cushion" from the sidewall. You would be more likely to bend/crack a rim going over a pothole. They also let alot of road vibration through. I personally am sticking to the 50 series.
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