MarkTapson
Pack Dog
Guys maybe I am thinking way to far outside the box...feel free to slap me back in!! 
...I am busy with my project bike and would like to get a little bit more meat in my rear shock spring. I am no lightweight at 115kg . Now I remember getting a 11.5 kg/mm rear coil spring upgrade for my XR650R whose stock spring was only 9.2 kg/mm. Also my front springs from a 0.43 kg/mm to 0.53 kg/mm, it made a huge different offroad for me.
Now my 660R rear spring for my weight I am sure needs some 'meat" .(by the way does anyone know what the stock rating is the standard spring??) If I use the Racetech calculator which puts my weight , fuel tank size, riding ability , general terrain...I picked dirt here to cover the most extreme....I put all these parametrs into the calc it comes up with a ...you guessed it a 11.5 kg/mm coil spring!! Now try find one in the Vaderland...only can find imports at around R1500+.
So.... now I climb out the box....start phonong around...I find a company here in Bokburg that make automotive springs for the offroad specialists etc. I give the guys a call and put my dilemma to them. The answers were: yes we make progressive springs and linear, yes we can make them to a specific Kg/mm rating , yes we can make to a specific size and custom to what you need. Now I am happy...but heres the kicker....I ask the guys ...ok, what will it cost me thinking if a bog standard rear coild spring at a bike shop or dealer is going to put me back R1500 then a "custom spring" will cost close if not more....no my friends...ball park figure is R95 - R150 !!!!! Sheez even if it s horrible and does not work for R100 it was a good try!! I didnt talk fork springs yet but I dont see those been much different in price and you can make them progressive...set then according to your weight/ fuel weight/ type of riding etc. Racetech calc will tell you what weight class to use. All we need is the dimensions of the original spring. ....hey its worth a try...I am going to try it for sure. :ricky:
We require the following information for manufacturing purposes.
•Free length
•Mean coil diameter
•Size of material
•Pitch or lead
•Space between coils
•Ground surface
•Outside diameter
•Inside diameter
...I am busy with my project bike and would like to get a little bit more meat in my rear shock spring. I am no lightweight at 115kg . Now I remember getting a 11.5 kg/mm rear coil spring upgrade for my XR650R whose stock spring was only 9.2 kg/mm. Also my front springs from a 0.43 kg/mm to 0.53 kg/mm, it made a huge different offroad for me.Now my 660R rear spring for my weight I am sure needs some 'meat" .(by the way does anyone know what the stock rating is the standard spring??) If I use the Racetech calculator which puts my weight , fuel tank size, riding ability , general terrain...I picked dirt here to cover the most extreme....I put all these parametrs into the calc it comes up with a ...you guessed it a 11.5 kg/mm coil spring!! Now try find one in the Vaderland...only can find imports at around R1500+.
So.... now I climb out the box....start phonong around...I find a company here in Bokburg that make automotive springs for the offroad specialists etc. I give the guys a call and put my dilemma to them. The answers were: yes we make progressive springs and linear, yes we can make them to a specific Kg/mm rating , yes we can make to a specific size and custom to what you need. Now I am happy...but heres the kicker....I ask the guys ...ok, what will it cost me thinking if a bog standard rear coild spring at a bike shop or dealer is going to put me back R1500 then a "custom spring" will cost close if not more....no my friends...ball park figure is R95 - R150 !!!!! Sheez even if it s horrible and does not work for R100 it was a good try!! I didnt talk fork springs yet but I dont see those been much different in price and you can make them progressive...set then according to your weight/ fuel weight/ type of riding etc. Racetech calc will tell you what weight class to use. All we need is the dimensions of the original spring. ....hey its worth a try...I am going to try it for sure. :ricky:
We require the following information for manufacturing purposes.
•Free length
•Mean coil diameter
•Size of material
•Pitch or lead
•Space between coils
•Ground surface
•Outside diameter
•Inside diameter
