How to measure spring rate? - Page 2 - SV650.org

DavieSV · 06-01-11, 08:14 PM

Quote:

Originally Posted by zadar

RSVR as aprilia 1000? those are usually in 500lb range for race bike with lighter rider.
If you using 1.0 in front you should be around 550 on rear.

Yes standard sachs shock from Aprilia RSVR 1000 K6.

06-01-11, 08:33 PM

Not sure what rate standard Sachs uses, I know guys run 500-600 on those bikes.

yorkie_chris · 06-01-11, 11:22 PM

But this shock is on SV.

If you are getting lots of squat with lighter spring, what length is shock set at? If short that can mean lots of squat as you open it up and running wide.

To calculate spring rate is very simple, units are pounds per inch... force per displacement so just divide force by displacement.

Springs are often non linear at the extreme ends of their compression so you should log a curve every couple of mm, there may be some odd bit in first 5mm that can be ignored. If you plot a curve then just measure gradient of the line.

DavieSV · 07-01-11, 10:37 AM

Quote:

Originally Posted by yorkie_chris

If you are getting lots of squat with lighter spring, what length is shock set at? If short that can mean lots of squat as you open it up and running wide.

Shock is set slightly longer than stock.

yorkie_chris · 07-01-11, 10:59 AM

Try +10mm from stock, 340mm between centers.

06-01-11, 08:33 PM	#12
zadar Guest Posts: n/a	Re: How to measure spring rate? Not sure what rate standard Sachs uses, I know guys run 500-600 on those bikes.

06-01-11, 11:22 PM	#13
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: How to measure spring rate? But this shock is on SV. If you are getting lots of squat with lighter spring, what length is shock set at? If short that can mean lots of squat as you open it up and running wide. To calculate spring rate is very simple, units are pounds per inch... force per displacement so just divide force by displacement. Springs are often non linear at the extreme ends of their compression so you should log a curve every couple of mm, there may be some odd bit in first 5mm that can be ignored. If you plot a curve then just measure gradient of the line. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat Last edited by yorkie_chris; 06-01-11 at 11:24 PM.

07-01-11, 10:59 AM	#15
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: How to measure spring rate? Try +10mm from stock, 340mm between centers. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

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