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Rear spring 260, 247, 252

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Question regarding 2017 sxf450

Manual has the following info regarding spring rates

Spring rate (SX‐F US)
Weight of rider: 65... 75 kg (143... 165 lb.) 42 N/mm (240 lb/in)
Weight of rider: 75... 85 kg (165... 187 lb.) 45 N/mm (257 lb/in)
Weight of rider: 85... 95 kg (187... 209 lb.) 48 N/mm (274 lb/in)

makes sense.  I believe stock is the 45N/mm; claim is bike is setup for 165-187lb rider

oem parts list has the following info

SPRING 260 36 N/MM 
SPRING 247 39 N/MM
SPRING 247 42 N/MM 
SPRING 247 45 N/MM 
SPRING 247 48 N/MM
SPRING 252 51 N/MM

Is there any significance to the numbers (260, 247 and 252)?  What do they mean?  I get the 36, 39, 42.... But I don't understand the 260,247, 252.

 

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I'm still confused.

The 39, 42 45 and 48 all have 247.  The 36 has a bigger number @ 260 and then the 51 has a shorter length @ 36.

I would think the spring that is designed for lighter riders would be the shortest and the longer lengths for heavier riders.  That doesn't appear to be the case.

SPRING 260 36 N/MM 
SPRING 247 39 N/MM
SPRING 247 42 N/MM 
SPRING 247 45 N/MM 
SPRING 247 48 N/MM
SPRING 252 51 N/MM

What determines the spring rate other then looking at these part # on the oem spring rate page?

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Don't worry about the lengths , it's not important , it's the rate , your over thinking it

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