"Dave Larrington" wrote in message ...
Bob500 wrote:

But, need advice on this one. Looking at purchasing an Airless Manaco
tire 700x28c for the rear. Anyone have an experience with this type
of tire?

Short answer: Don't.
Long answer: AASHTA URL: http://www.sheldonbrown.com/gloss_a.html#airless

I have found Greentyre, NoMorFlats and NuTech to be heavy and mushy
(too much rolling resistance). I have had no experience with Airless
Manaco. I now am trying a Kevlar belted Primo Comet. Between the
inside surface of the tire and the air retaining tube I have placed a
thorn resistant tube that was sliced down the inside and the valve
removed. I reason this to provide signficant belt and sidewall
protection. Kevlar belted tires only protect the belt area, not the
side wall where I have gotten most of my goathead flats. The liquid
protection products such as Slime migrate toward the belt as the tire
rotates leaving, I reason, the side wall with little protection. I
believe SPECIALIZE makes a 700 tire with Kevlar that covers the side
wall as well as the belt area.
My next experiment is to try the product developed by www.notubes.com.
I have read that Kevlar contributes in a signficant way to increasing
rolling resistance.
I ride a Dragonflyer(out of production)tadpole trike.