Cycling Mob: Road Cycling, Mountain Biking and More - View Single Post

11-15-2004, 11:49 PM

Elisa Francesca Roselli wrote:

> Flyzipper has 20" wheels, weighs 12 kg, and is equipped with a fabulous
> 21-speed SRAM DualDrive shifter - three speeds in the front hub and
> seven on the rear derailleur.

No, the 3 speed hub is at the back and the derailleur mounts onto it.

> so. What is great about this system is that it cuts down on needless
> complexity. Behemoth has a Nexus 7 shifter, meaning that split-second
> decisions have to be made between all 7 gears. With Flyzipper, there are
> only 3, but each of those can be modulated through a whole spectrum of
> shades when there is leisure.

But the Dualdrive is more complex, so you seem to be misunderstanding
something somewhere... With the Nexus 7 if you want to change up,
change up, if you want to change down, change down. There's no "split
second decisions" you have to make at all, so I think basically it's all
a problem in your head. The point of a DD is more finely graduated
gears and a greater overall range than a hub, but it really is more
complex because you've got two independent shifting mechanisms. If it
works for you then that's Good, but for future reference don't get hung
up on hubs on their own being more complex to use, because they're not!

> I am amazed at the speed of this lil critter! He seems to be the fastest
> of my bikes. Can it be that the advantage of lightness compensates for
> the smaller wheels?

Lightness makes you quicker and as Dr, Moulton proved back in the 60s,
small wheels aren't nearly the problem that lots of people seem to
assume as long as you have a reasonably good surface, and "reasonably
good" certainly doesn't require a billiard table.

> paranoid about getting a flat. Why are there no local sellers? Is Dahon
> one of those American firms

Dahon are Far Eastern, and are the largest manufacturer of folding bikes
in the world.

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/

11-15-2004, 11:49 PM	#23 (permalink)
Peter Clinch Posts: n/a	Re: Dahon Impulse P21 is a Dream Bike Elisa Francesca Roselli wrote: > Flyzipper has 20" wheels, weighs 12 kg, and is equipped with a fabulous > 21-speed SRAM DualDrive shifter - three speeds in the front hub and > seven on the rear derailleur. No, the 3 speed hub is at the back and the derailleur mounts onto it. > so. What is great about this system is that it cuts down on needless > complexity. Behemoth has a Nexus 7 shifter, meaning that split-second > decisions have to be made between all 7 gears. With Flyzipper, there are > only 3, but each of those can be modulated through a whole spectrum of > shades when there is leisure. But the Dualdrive is more complex, so you seem to be misunderstanding something somewhere... With the Nexus 7 if you want to change up, change up, if you want to change down, change down. There's no "split second decisions" you have to make at all, so I think basically it's all a problem in your head. The point of a DD is more finely graduated gears and a greater overall range than a hub, but it really is more complex because you've got two independent shifting mechanisms. If it works for you then that's Good, but for future reference don't get hung up on hubs on their own being more complex to use, because they're not! > I am amazed at the speed of this lil critter! He seems to be the fastest > of my bikes. Can it be that the advantage of lightness compensates for > the smaller wheels? Lightness makes you quicker and as Dr, Moulton proved back in the 60s, small wheels aren't nearly the problem that lots of people seem to assume as long as you have a reasonably good surface, and "reasonably good" certainly doesn't require a billiard table. > paranoid about getting a flat. Why are there no local sellers? Is Dahon > one of those American firms Dahon are Far Eastern, and are the largest manufacturer of folding bikes in the world. Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/