MIN 

I have a bike with typical road geometry and a standard 368mm axle-to-crown (ATC) length fork. I want to put a 383mm ATC fork on in it's place because this new fork has fender mounts, which the current fork lacks. (So to recap, I am going from a standard carbon fork to a taller, more versatile steel fork.)

That's a 15mm height increase in the front, relative to the hub. I imagine that would lift the bottom bracket by about half that distance. (+7mm increase.)

Stock geometry:
73.5 HT
73 ST
70 BB Drop

Will this make my frame handle adversely? The BB is low enough at 70mm drop that I feel that it would be a reasonable change. I am curious to hear of others' experience with such a change.

Az B

Assuming both forks have the same rake, you will get slightly more trail. This will make the bike either more stable or sluggish depending on the exact amount of trail and your expectations. You could get a fork with less rake and end up pretty close to what you have. You need to make some careful measurements to determine this.

To measure trail, you draw a line with a straightedge following the angle of the headtube from the center to the ground. Then you drop a line from the axle of the front wheel to the ground. Trail is the amount of distance between the two, or the amount the wheel is trailing the frame.

Az

MIN 

Both forks are 45mm rake. The only change will be in the length.

enjoi

this isn't pointed at anyone in particular, but why would anyone be concerned with 1.5cm diff. What is the definition of adverses steering characteristics. I can jump from a beach cruiser, to a touring bike, to my caad4 c-dale to a tall bike and ride any of them without any trouble.