progressive fork springs....

**ducatilover** · 17th March 2006, 10:18

where would i get some racetech or progressive fork springs for my bros650? and what are gold valve emulators? and are they worth having?

**cowpoos** · 17th March 2006, 10:26

Originally Posted by ducatilover

where would i get some racetech or progressive fork springs for my bros650? and what are gold valve emulators? and are they worth having?

you don't want progresive springs for a road bike [good for dirt bikes] you want linier rate springs....
and any form of cartiridge emulator is well worth having in a conventional fork.. ring robert taylor at hawera motorcycles 06 2784160 for all suspension questions

**ducatilover** · 17th March 2006, 10:28

Originally Posted by cowpoos

you don't want progresive springs for a road bike [good for dirt bikes] you want linier rate springs....
and any form of cartiridge emulator is well worth having in a conventional fork.. ring robert taylor at hawera motorcycles 06 2784160 for all suspension questions

why not progressive springs? dont they stiffen towards the end of their travel?

thanks for the number

**cowpoos** · 17th March 2006, 10:37

Originally Posted by ducatilover

why not progressive springs? dont they stiffen towards the end of their travel?

thanks for the number

yes they do and thats the problem with them...you want your suspension to be softer at the end of the travel...the opposite to what most people will tell you...road bike suspension should be digressive never progresive...

**pritch** · 17th March 2006, 11:47

As I understand it, when you fit your Ohlins, WP, whatever forksprings they are constant rate. You throw the oe (progressive?) springs in the can.

**Pixie** · 17th March 2006, 11:54

Originally Posted by cowpoos

yes they do and thats the problem with them...you want your suspension to be softer at the end of the travel...the opposite to what most people will tell you...road bike suspension should be digressive never progresive...

correction Mr Poos
Dr Bob advocates linear springs and digressive (should be regressive) damping.

I'd like to see a regressive spring..... it would be a wonder to behold and would defy the laws of physics.

**The Stranger:Me** · 17th March 2006, 12:06

The ones that Robert Taylor supplied for my bike are constant rate and far superior to the original progressive rate springs.

Best value mod you can make, for a few hundred dollars I can carry a lot more speed in the corner.

**cowpoos** · 17th March 2006, 12:49

Originally Posted by Pixie

correction Mr Poos
Dr Bob advocates linear springs and digressive (should be regressive) damping.

I'd like to see a regressive spring..... it would be a wonder to behold and would defy the laws of physics.

I said "should be" and I also said linear springs are the go....a re-read would be in order lad!! and yes you can make a spring digresive/regresive by using linkages on the rear shock of the bike...as all race teams do and most mordern bikes do...

**cowpoos** · 17th March 2006, 12:51

Originally Posted by CaN

constant rate and far superior to the original progressive rate springs.
.

constant rate is linear....

**Lou Girardin** · 17th March 2006, 15:17

How did this get from fork springs to shocks?
BTW linear rate is best. Progressive springs were fine in theory, never seemed to work properly.

**jonbuoy** · 17th March 2006, 15:24

Econohonda got me some for the VTR, Hyperpro ones You can find out what value to use from the Hyperpro website then get them to order them in. I find them miles better than the standard VTR ones, has made a huge difference to the front end. Not sure how different Linear ones would feel in comparison. I'm sure there must be a reason to go to all the trouble of making them progressive , the original showa ones were progressive too.

**Paul in NZ** · 17th March 2006, 15:43

Meh! Both my bikes have progressive suspension.

In fact, when they were made suspension was considered a pretty progressive step, especially at both ends!

Paul N

(put it this way, the triumph is a competition model so it comes from the factory with sidecar springs)

**Paulus** · 17th March 2006, 18:39

Gold valve cartridge emulators are only for those that don't already have a bending shim stack type damper. In a normal orifice type damper there are fixed size holes for the damper oil to flow through. These ports will only flow at certain rate causing them to lock or spike on big (speed) hits. In a bending shim system the bigger (faster) the hit the more the shims will bend and so the more damper oil they will flow. You can also put them together in ways to give yourself differing damping characteristics. They are a speed sensitive damping system.

The Gold emualtors use a spring loaded poppet valve to partially emulate the characteristics of a bending shim system. You usually have to enlarge your old damper holes so that they are no longer providing the damping control.

This is a bit of a simplification but hopefully it will help with the understanding. I seem to remember that there was a good article on Penske's website if you want to see how bending shim stack dampers function.

Also the air spring effect at the end of your forks stroke will make them progressive at the end anyhow.

**Jackrat** · 17th March 2006, 20:21

Originally Posted by ducatilover

why not progressive springs? dont they stiffen towards the end of their travel?

thanks for the number

Yes I put Progressives in my XS and they improved the front end responce and allround handling out of sight,they acted on the whole feel of the front end not just the final part of the travel all though that was better than I'd even hoped for.They are probably the cheapest and easiest up grade you can do.They work really well and can be bought for any bike.

**ducatilover** · 17th March 2006, 20:22

i'll have to talk to the mechanic doing the work on the forks, but from what has been sdaid i'll get some valve emulators and some lineir rate springs

so i take it i can change the damping rate if i have gold valve emulators?