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  1. #1
    mtbr member
    Join Date
    Aug 2006

    Chain comparison, SRAM and Shimano.

    SRAM PC-991 and Shimano HG73. I ran these bad boys through the ultrasonic and after I dried them off I decided to measure them with my digital calipers and see how they differ. The SRAM looked bigger (and measured out that way) than the Shimano which I found interesting being as they are both 9 speed chains. I dont know if any of this makes much difference but thought some may find it interesting. Only thing I see is that perhaps the smaller size of the shimano would make it more likely to break on the plates but perhaps stronger on the pin due to that being bigger.

    Measurements are as follows (All measurments done on big links).

    Link length (measured across outside of link):
    HG73- 20.88 mm
    PC-991- 20.75 mm

    Link Height (measured at tallest area where pin is):
    HG73- 8.26 mm
    PC-991- 8.34 mm

    Link Width (measured at widest part of link in the middle):
    HG73- 6.52 mm
    PC-991- 6.53 mm

    Pin Width:
    HG73- 3.75 mm
    PC-991- 3.65 mm

    Roller Width (measured across roller length wise):
    HG73- 7.52 mm
    PC-991- 7.58 mm

    Also of note the clearance between sideplates of the bit links and the small links is twice as large on the Shimano chain. I figured this would mean more flex in the chain laterally but they both have the same amount of side flex along the chain. I figure that the extra clearance would make it easier for dirt to enter the Shimano chain.

    Last edited by Colorado S14; 07-03-2007 at 08:17 AM.

  2. #2
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
    Join Date
    Jan 2007
    you have way too much time on your sure your not a recumbent rider?

  3. #3
    mtbr member
    Reputation: gdl357's Avatar
    Join Date
    Feb 2007
    Forget that SRAM 991 and get a real chain... Shimano XTR 7701. Only then will you know what your missing in shifting quality.. I know.

  4. #4
    mtbr member
    Reputation: frisky_zissou's Avatar
    Join Date
    Jun 2006
    Sram is lighter by a rough 20 grams isnt it?

  5. #5
    Chrome Toaster
    Reputation: Hecubus's Avatar
    Join Date
    Jan 2004
    Looks like SRAM slightly shrunk the chain to save weight. If not mistaken I believe their earlier models like the PC99 where 7.1mm wide. Shimano has always been 6.6mm as you conformed.

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