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Discussion Starter · #1 ·
Wheel Tire Sky Cloud Vehicle


This is me on a ninja 300 stock gsxr600 rear shock and in this picture it kinda looks like that its soft??
but this was a slow corner and accelerating hard on this picture

anyway i was thinking of having my rear shock serviced and while at it would replace spring as needed
 

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Check suspension suppliers. They often have calculators on their site and list the original rate.

Most often for track use the original spring rates are too soft - especially if you may be a larger person.
 

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i only weight 77kg / 169.5 lbs although i am 6ft3
Figure your weight with full gear, and enter it into the calculator. They will usually allow you to factor-in riding style as well. For track riding, you are usually at the higher end of the scale for your weight.

I know Sonic Springs had a calculator, but not sure if they produce rear springs in addition to their fork springs. It still may give you some idea.

If you still have your stock rear shock, you probably want to upgrade that as well.
 

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Maybe you can get the spring from another GSXR. Here is a table someone posted in the other forum with the spring rates for each year of GSXR shock and the intended rider weight.
I'm 145 without gear and the calculators give me around 7.6 kg/mm riding track at intermediate level.

kg/mmlbs/inchRider WeightEye to eye
98-00 GSXR600
6.4​
360​
58-64
01-03 GSXR600
8​
450​
141-149
325​
04-05 GSXR600
7.6​
425​
120-128
332.5​
06-09 GSXR600
9.4​
525​
214-224
11-13 GSXR600
10.1​
565​
250-261
311​
00-03 GSXR750
7.2​
400​
99-107
325​
04-05 GSXR750
7.3​
410​
105-112
332.5​
06-07 GSXR750
9.5​
530​
219-229
08-10 GSXR750
9.5​
530​
219-229
11-19 GSXR750
10.5​
590​
271-282
319​
01-02 GSXR1000
7.7​
430​
125-133
329.5​
03-04 GSXR1000
8.6​
480​
172-181
332​
05-06 GSXR1000
8.1​
455​
146-155
332​
07-08 GSXR1000
10.1​
565​
250-261
09-11 GSXR1000
11.6​
650​
329-341
 

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Discussion Starter · #7 ·
I think racetech has also a calculator, but I don't remember if they do spring for rear shock
issue i have with the racetech calculator is that
when i input ninja 300 it shows me:
Recommended Spring Rate: 8.63 kg/mm

and when i input a gsxr600 it shows me
Recommended Spring Rate: 9.99 kg/mm (Use closest available)


So which one would i follow? since i have a ninja300 with a gsxr rear shock guessing its 06 not sure since i bought the bike like this
 

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Discussion Starter · #8 ·
Maybe you can get the spring from another GSXR. Here is a table someone posted in the other forum with the spring rates for each year of GSXR shock and the intended rider weight.
I'm 145 without gear and the calculators give me around 7.6 kg/mm riding track at intermediate level.

kg/mmlbs/inchRider WeightEye to eye
98-00 GSXR600
6.4​
360​
58-64
01-03 GSXR600
8​
450​
141-149
325​
04-05 GSXR600
7.6​
425​
120-128
332.5​
06-09 GSXR600
9.4​
525​
214-224
11-13 GSXR600
10.1​
565​
250-261
311​
00-03 GSXR750
7.2​
400​
99-107
325​
04-05 GSXR750
7.3​
410​
105-112
332.5​
06-07 GSXR750
9.5​
530​
219-229
08-10 GSXR750
9.5​
530​
219-229
11-19 GSXR750
10.5​
590​
271-282
319​
01-02 GSXR1000
7.7​
430​
125-133
329.5​
03-04 GSXR1000
8.6​
480​
172-181
332​
05-06 GSXR1000
8.1​
455​
146-155
332​
07-08 GSXR1000
10.1​
565​
250-261
09-11 GSXR1000
11.6​
650​
329-341
is there a sure way to know what year my gsxr rear shock is? i dont want to buy another used one because they would need to be rebuild anyway or atleast change the oil in them since they are probably foaming inside because of their age
 

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is there a sure way to know what year my gsxr rear shock is? i dont want to buy another used one because they would need to be rebuild anyway or atleast change the oil in them since they are probably foaming inside because of their age
Maybe you can get another GSXR shock and use only the spring? I don't know how easy or hard it is to swap the spring.

I think different generations of GSXR shocks have different colors and they look slightly different in shape. You could look for pictures of GSXR shocks on eBay and figure out which one looks like yours.
 

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710 Posts
issue i have with the racetech calculator is that
when i input ninja 300 it shows me:
Recommended Spring Rate:8.63 kg/mm

and when i input a gsxr600 it shows me
Recommended Spring Rate:9.99 kg/mm (Use closest available)


So which one would i follow? since i have a ninja300 with a gsxr rear shock guessing its 06 not sure since i bought the bike like this
I'd say the calculator it's considering the weight, engine power and brake power of the bike, so you should use the rate recommended for the N300.
 
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