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  1. #1
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    Reputation: GorillaTactics's Avatar
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    Rear shock spring rate for FR/DH bikes

    Just curious what other big dudes are using on their gravity bikes. I weight about 275, I have a Rocky Mountain Flatline with a Marzzocchi Roco rear shock, equipped with a 500lb spring. I've found myself bashing my size-14 shoes into the ground on even medium-sized landings and would like to stiffen the rear up a bit. Looks like the stiffest spring available from Marz is a 550, and it doesn't seem like 10% would make a huge difference.

    I've heard that the spring manufacturer doesn't matter as long as the shock stroke and eye-to-eye match up, any truth to this? Fox and some other companies seem to make stiffer springs than Marz. Any advice is much appreciated.

  2. #2
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    How much sag are you running?

  3. #3
    AKA. Molasses
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    No gravity here, just trail type riding at most.
    At 285lbs. I use an 800lbs rated spring on my 7.5x2.0 Fox shock.
    JEB

  4. #4
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    I went to Go-Ride (local shop specializing in gravity bikes) and they measured my sag level, and estimated I'd need a 600lb spring for my 3 x 9.5 in rear shock. Problem is, Marz doesn't make one as I mentioned above. They told me a Manitou spring should work, but weren't able to order one for me because all the distributors are sold out.

    I've been doing more research from other online dealers and getting a lot of conflicting information. Some places say Manitou spring -> Marz shock won't work at all. And a few of my buddies still swear that Fox springs can work on a Marz shock, but the guys at the bike shop told me they had a different interior diameter so that wouldn't work. Not really sure what to do at this point. I might be stuck buying a completely new Fox rear shock, since they seem to actually make springs for big guys.

  5. #5
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    It sounds like you need to find a buddy with a similar stroke Fox shock and borrow his spring and test fit it on your shock. If it doesn't work, I think a new (better yet used) Fox or Elka shock may be in your future.

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