taco eater :
Mitchell Hoover from San Jose, CA United States
These springs work on Peugeot Doppler clutch shoes, not sure about anything else. Im currently using the yellow springs on steel spx shoes. Best combo imo
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aw man
April 15, 2013
taco eater :
Tommy from Charlotte
damn... bought these for my flat reed and the springs got all warped when I stretched them on!?
the silver and gold weren't that strong, however the black ones were craaaaaaaazy and I couldn't even stretch them on my flat reed by my self. bring your friends, and maybe you can get them on with a friend.
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decent.
June 30, 2012
taco eater :
Ryan Nash from Columbia, MO United States
yellows are about 1.5k-2k reds are 3k blues are 4k-5k
now with that being said... yellows are great for hobbit DR/proma setups. reds are great with hobbit/athena/weak-ends, simo calibrata. I haven't done much testing with the blues besides putting them on a stock derbi laguna and exploding the clutch, so yeah. don't use the blues on a stock derbi clutch. I have them on my kitted flat reed and they rev to about 4k, it's ok --- but I need more rev but not willing to put the MHR black springs on which rev to about 8.5k. these springs are probably best suited for hobbit clutches as you really gotta stretch 'em to put 'em on a flat reed, and kinda stretch 'em for a piston port/pyramid reed derbi.
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Launch a Hobbit like a rocket
July 8, 2011
taco eater :
wayfast whitie from Boston
First I tried the mellow yellow. Then I tried the rippin red. I tried and tried to get the blue springs on, and when I did... I blue a nut when it pulled a power wheelie. Would be 5 stars, but I sprung a red spring when I removed it.
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spot on for hobbit
November 1, 2010
taco eater :
rock dude from johnson vt
running the yellow ones on my daily driver. puts me just into the power band. easy to put on too.
Works on Peugeots!!! 
aw man 
decent.