If you bought the bike new then surely they're standard? If not then you can't be sure but you should know if they are softer or harder than the ones you have in now?

 

I didn’t buy either bike new, but pretty sure they were standard. One bike was made softer, one was made harder but that still doesn’t tell me what they are.

 

Ask Kev - he has details of how you measure them. All to do with wire diameter and other hocus pocus

 

Easy way to check.

Get a piece of pipe the spring fits inside. Seal the lower end. Fill with oil right to the brim. Slowly place the spring in and catch any displaced oil. Measure the displaced oil. 38ml is 3.8nm spring. 42ml is a 4.2nm spring. 46ml is a 4.6nm spring and so on.

A slick as you like method of checking unknown springs. Stops them rusting to.

 

I’d rather bin them than do that.

 

can't see that working with the different length springs etc

 

Gutted. I wrote that after the pin last night and expected a right hoo hah. Nothing. :rotflmao:

It was a joke so please don’t go filling tubes with oil

 

You’ll need a spring that you know for defo what the NM is and is the same length with the same number coils to compare to the unknown spring. Measure the coil thickness with a caliper, if one spring coil has a 5.1mm thickness and you know that to be a 4.6nm spring then a 5.5mm measured coil will almost certainly be a 4.8nm spring. The difference in thickness between weights of springs is a fraction of a mm.

 

Sort of If your wire dia is 5.1mm (fairly common on adult bikes) then 25 coils = 4.7, 24 and 3/4 = 4.8, 24 and 1/2 also = 4.8 etc. Better if they just stamped the flaming things.

 

Maybe I will just bin them. Really can’t be arsed with it, can’t believe they are worth much anyway.