Bought these based on reviews about how well they fit derbi clutches. Had a pretty hard time getting all three on. In the end, heavy duty snap ring pliers with a bit of modification saved the day!
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nice fit
February 12, 2017
taco eater :
DOOV from blast city
I would say they stall like MHR red springs except they are actually made to fit flatreed clutches. noice.
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work great on version 1 puch e50 hammer
November 1, 2013
taco eater :
Goose from D
had to modify slightly to get them on, but they slip till 25-30mph!
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Derbi LURCH
September 30, 2013
taco eater :
Chris Toth from Athens, GA
tried all of the polini springs, these are better, and easier to install. feels like I unleashed a monster
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derbi puch gila
August 23, 2013
taco eater :
Ryan Nash from Columbia, MO United States
got these on my buddies derbi piston port with a puch gila kit on it... real easy to get on because they were made for derbi unlike some of the other springs which need to be stretched or man handled to get on. these have a super nice stall to them, probably the best springs made specifically for derbi at this point. i'd say these probably won't break over time like the other ones, or at least not as easy as the other ones since they don't need to be stretched or pried on.
Not the easiest to get on 
Derbi LURCH