` wrote:
> On Mar 4, 8:15 pm, nob...@xmission.com (Scott) wrote:
>
>> From elsewhere (Dennis Kirk), there are aftermarket parts that are said
>> to fit, for just about $250 for the pair. The problem there is that the
>> shocks and springs are separate items, and there are two listed spring
>> fitments, "standard" and "heavy duty". They do list spring rates, 90/130
>> and 105/150 respectively. But I have absolutely no idea which ones I
>> want. How can I decide?
Get some with the springs installed. Any decent brand will do. Ring the
manufacturers up and give them your weight and whether you are a hoon-monkey
or cruiser type rider and they -should- sort you out.
>
> What do you weigh?
>
> The typical solo rider weighs about 175~180 pounds and the 90/130
> springs are adequate.
>
> It's unlikely that you are an average weight rider that carries a
> passenger frequently, so the 90/130 springs would probably work fine
> most of the time.
>
> But a rider that's 6' 4" and weighs 240 pounds *might* like the
> 105/150 springs for solo riding.
>
> Do you know whether the DK springs are true progressives or are
> actually dual rate springs? Dual rate springs will provide an
> initially soft ride as the closer spaced coils compress, then the ride
> will get about 33% harsher *suddenly* as compared to a true
> progressive wound spring where the increasing rate continues
> gradually.
>
The softer rate spring is pushing on the harder spring. If you had dual coil
+ spacer type with a silly rate of 50/150 and 1" worth of 'gap' in the soft
spring, by the time that went coil bound, the harder spring would be
compressed by 1/3", or so you'd think. It isn't quite as simple as that, but
that is the barebones of it.
Progressive wounds have the same rate coil, but closer windings at one end.
The number of coils makes a difference. Fewer coils = stiffer spring. It is
just a torsion bar wound in to a spiral after all.
> Also, www.racetech.com has a spring rate calculator program where
> riders can enter their weight and their riding ability and it will
> deliver the optimum straight wound spring rate for that rider.
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>
>> From elsewhere (Dennis Kirk), there are aftermarket parts that are said
>> to fit, for just about $250 for the pair. The problem there is that the
>> shocks and springs are separate items, and there are two listed spring
>> fitments, "standard" and "heavy duty". They do list spring rates, 90/130
>> and 105/150 respectively. But I have absolutely no idea which ones I
>> want. How can I decide?