The difference in diameter is 8mm (630mm vs. 622mm) so the difference in radius is 4mm. You'll have to lower the pads 4mm. [With thanks to my first grade teacher Miss Peck in P.S. 254 Brooklyn, N.Y.]
Martin Needleman Annapolis, MD
jamie swan wrote:
>
> 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
> >
> > b.b.simon@att.net 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