> On the aluminum frames, 451s will fit both front and
> rear, but you need an
> extremely long-reach rear caliper- I can't find a
> releable source, but you might
> have better luck. Front will just barely work with
> a 68mm Shimano, so you
> can only do a brakeless rear/fixed 451 with
> off-the-shelf components.
>
> The new steel one will work with 68mm calipers front
> and rear.
>

p.s. I measured the rear reach on my alu swift. A 68mm caliper should work.[/QUOTE]


question on the break-thing:
Will a longer caliper break work on a (old) steel-fork together with a 451-rim?
What will the size of the calipers need to be? (min-max)
Thanks for getting out your vernier calipers.