To add to Dave's comments, I have an ST 'Custom' which was a KMX demo
model that had decent wheels, triple chainset, etc. fitted by KMX for
road use, so they can be upgraded if you want. However, in their
basic form, I agree that the X class is a much more useful machine
than the ST class. I only use mine on road and wouldn't have
considered the basic ST, for the reasons that Dave has said about the
lack of gears and the poor rolling resistance of the tyres. I
actually think the price difference between the ST and X is small
considering the improvements you get.

Gareth

--- In KMXKartsowners@yahoogroups.com, "Ana Pereira"
<cenasapedal@...> wrote:
>
> Hi,
>
> Can anyone explain to me what are the differences between the ST and
> the X that make the latter better and more expensive?
>
> The X has 24 gears, Maxxis Hookworm tyres and a 24'' (alloy rim)
wheel
> on the back, while the ST has 7 gears, KMX tyres and a 20'' back
> (Nylon Mag) wheel.
>
> This are the obvious differences I found. Besides the gears, what
> makes the X better? Its wheels are more fragile than the ST's,
right?
> And they must be the same weight because both models weight 19.5
Kg...
>
> So why is the X more expensive? Does the bigger back wheel offer
some
> advantage? Why doesn't the X come with mag wheels too? What's the
plus
> on the alloy rim?
>
> I haven't yet seen (let alone ridden!) an X up close.
>
> Cheers,
>
> Ana
>