>>2015058Unless it's knocking for and aft it's the right size. Many "sealed" systems from yore are designed like that. If it rains just keep an eye on those components.
>>2015047I did this on a frame(max 160mm, went to 180mm)
Pros? More fork, slacker angle, longer front center.
Better for descents
Cons? More force on headtube/downtube junction, heavier, seat tube angle slacker, longer bike, worse uphill and on flats.
On older bikes it's viable, wouldn't on new ones since they all have DH geo anyways.
>>2015053Then go up to around that length.
Real issue with cannondales is they use a weird headtube size so parts can be weird to convert to a different fork.
Still possible, just do your research.