K2 / Proflex Riders Group

General => Tech Forum => Topic started by: keith on May 01, 2009, 03:03:09 pm

Title: rear shock question
Post by: keith on May 01, 2009, 03:03:09 pm

I have a girvin ods shock on the rear of my 96 beast and no spring. What length and diameter spring do I need,and what size(in lbs), I'm around 13 stone?

Title: Re: rear shock question
Post by: Colin on May 03, 2009, 11:05:15 am

It depends upon which spring conversion kit you have.
The two that I am aware of (Speedspring and RDS) both use replacement "top hat" spring end plates.

Just measure the min/max length between the end plates when the pre-load is wound fully out and in and get something inbetween.

I have run 90mm long Speedsprings on my XP-X, but you can go down to about 74mm which is the length of the Ti Coils that I currently use. Internal bore is 32mm.

The right weight spring for you is:

Rider weight (lb) / Spring rate
150-190            / 350in/lbs


Col.

Title: Re: rear shock question
Post by: rapiddescent on May 06, 2009, 01:26:09 am

the options for an 856 are:
+ the short noleen NR2 that had the specific end cap for the 856 strut
+ speedsprings (not sold anymore)
+ cor springs (nb: I sell these; we had a big delivery of them this weekend) http://www.rapiddescentscotland.co.uk
+ Stratos Strata air shock  (I haven't seen one in a while)
+ Risse Genesis with the adapter

the cor springs are about 190lbs/in for the front and about 340ish on the rear and as colin says, use cnc'd end caps that fit over an ODS shock.

callum