P-Nuckle Tension Screw

P66
P66 Posts: 132
edited August 2007 in MTB workshop & tech
I read that if you tighten the P Tension screw then it stops the chain bouncing around but adds more friction to the chain.

Can anyone tell me if it's worth the risk and if it's a real benifit to do this.
I can hear bats.

Comments

  • nicklouse
    nicklouse Posts: 50,675
    you mean the B screw? on a shimano mech. just set it correctly to give the required clearance to the cassette.

    different spring for the chain tension.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    No, its on the P-Nuckle, it's a 2mm hex key screw.
    I can hear bats.
  • nicklouse
    nicklouse Posts: 50,675
    on what?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    Rear Mech, the bit that the jockey cage attatches to.
    I can hear bats.
  • nicklouse
    nicklouse Posts: 50,675
    the B screw.

    http://www.parktool.com/repair/readhowto.asp?id=64

    der01.jpg
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    NOOOOO, P screw
    derailleur4.jpg
    Where the hex key is pointing
    I can hear bats.
  • BoredHousewife
    BoredHousewife Posts: 416
    I like this thread, its funny :D
  • nicklouse
    nicklouse Posts: 50,675
    just getting there. :wink:

    well if you think about it putting more tension in there will require more tension in the B screw as well. or there chain will be too close.

    Ok bach to the original Q. what is it going to do put more force through the whole shifting system as well as the chain. but if you have the alternative position available and chain tension is an issue i cant see it reducing chain life that much.

    but the B spring will also need to be considered as that allows the whole mech to move.

    Are you having gear issues on the Orange?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    No, no gear issues at all, it's just a bit noisey. It said in Zinn and TAOMBM that if you put more tensoin on this screw then it reduces the amount the chain rattles around when going over the rough stuff.
    I can hear bats.
  • nicklouse
    nicklouse Posts: 50,675
    BoredHousewife wrote:
    I like this thread, its funny :D

    i know :oops: first time that i have heard of anyone asking about the P tension Ever.

    B screw and B tension often....
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    That's quite interesting. Trust me to be the annoying one. I'll go mess with it and get back to you about what happens.
    I can hear bats.
  • nicklouse
    nicklouse Posts: 50,675
    P66 wrote:
    No, no gear issues at all, it's just a bit noisey. It said in Zinn and TAOMBM that if you put more tensoin on this screw then it reduces the amount the chain rattles around when going over the rough stuff.

    tbh i dont think it will do anything on the orange as there is no chainstay for the chain to rattle on. yes it might help control the upper length of chain abit and reduce some contact with the swing arm but the top run of chain does not move much unlike the bottom length.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • P66
    P66 Posts: 132
    That's a very good point. right, I won't do it now. Cheers.
    I can hear bats.
  • BoredHousewife
    BoredHousewife Posts: 416
    nicklouse wrote:
    i know :oops: first time that i have heard of anyone asking about the P tension Ever.

    B screw and B tension often....

    It was just the way you both supported your 'argument' with pictures, I was just curious about what the hell the 'p' screw thing was. Cheers for a chuckle though, I'm still bowing down to superior knowledge :shock:

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