That sounds like a great speed for 180 Challenger.
I bought our spare for the trailer at West Marine. Our trailer is for a 210 Wake so we have the tandom-axle. We also could not find a direct replacement (exact size) without spending quite a bit more money. My thought process was it is a spare so it will only be used for a short period of time so it should be okay.
Our factory tire is a 185/80 D13 (left picture) and our spare is a 175/80 D13 (right picture) so it the spare is just one size narrower. So as you can see we were in the exact same boat as you, literally (lol).
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Our challenge is now finding a spare tire mount that will work with our setup, they offer them on the custom trailer from SeaDoo but the dealer has not been able to locate that part number for me to order for our galvanized trailer. The key is it appears to be a 45/45 angle so the bow of the boat will clear it when pulling onto the trailer. Most most mounts I have seen are 45/90 which will cause the bow of the boat to rub on the tire when pulling back onto the trailer. The mount we are looking for is featured on this 2011 230 Wake's customer trailer.
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