I think Martin is right. 27" is 630mm diameter, 700C is 622. The pads must be lowered by the difference in rim radius, half of the diameter difference of 8mm. That is 4mm as he said. If you are at the bottom of the brake adjustment, this can be a problem, but usually it is OK.
> I hate to contradict you Martin, but I think the difference in diameter is more
> then that. If you try installing 700c wheels on a bike set up for 27" the brake
> pads will be bearing almost entirely on the sidewall of the tire. I think that you
> need to be able to lower the pads about 10 mm.
> Jamie Swan - Northport, N.Y.
> Martin Needleman wrote:
> > No biggie. Just rebuild your wheels with 700c rims. The brake pads will
> > have to be lowered about 4mm - the thickness of two spokes.
> > Martin Needleman
> > Annapolis, MD
> > firstname.lastname@example.org wrote:
> > >
> > > good day,
> > > i have a question on my atala with 5 speed freewheel and 27 1-1/4" wheels and
> > > that is can i convert to 700c wheels? how is this done? thanks,
> > > burl simon in warm and sunny los angeles