While I don't think anyone has used this particular fork on the Swift yet. I just ordered the $80 Redline Flight R6 for my Downtube and it seems like it might also be a pretty good upgrade for the Swift.
Stock Swift fork:
894g
32cm axle to crown height
http://www.bikeforums.net/showthread...nge-out-dilema..
Redline Flight R6/U6:
483g
32.1 axle to crown height
http://www.niagaracycle.com/product_...oducts_id=4248
https://www.jrbicycles.com/storefron...productId=1582
Not sure if there's a significant difference in offset/rake. Also, beware that the Redline fork has a 135 pound rider weight limit...but that's for BMX racing and I presume it'd be much higher if rated for road use.
The normal straight (untapered) 1-1/8" steerer will also require/allow the use of this aluminum riser (or a one piece stem-riser) which is surely much lighter than the stock steel riser:
http://calhouncycle.com/productcart/...&idproduct=978
You'll also need some kind of clamp or locking spacer/top nut to retain the headset tension (there are a number of premade and DIY solutions).
Basically I'm suggesting the same mod seen in this thread, but with the 483g $80 aluminum fork instead of the rare 435g $150 carbon fork that was used:
http://www.bikeforums.net/showthread...nge-out-dilema..
I guess for a pure weight saving mod it's a lot more involved than wheels/tires/seatpost, but I was looking to ditch the suspension fork and folding riser on my Downtube brand bike anyway.