fitting a double chain device

bamba
bamba Posts: 856
edited February 2011 in MTB workshop & tech
Got me a double chain device from super star the other day, bb mount,for my trance X4 2010
http://superstar.tibolts.co.uk/product_ ... cts_id=336
Looks like could be problem as clearance around the suspension linkages is a bit tight to say the least,when offered in to place,

05012011042.jpg

have any other trance or poss other Giant Maestro equipt owners out there mananged to fit such device,cutting some excess material off could be an option.
still got to sort the chain line problem too,not an easy job me thinks.
My Trance

Comments

  • nicklouse
    nicklouse Posts: 50,675
    perhaps a non dual fit device would have been better.

    saw time.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ricardo_smooth
    ricardo_smooth Posts: 1,281
    send it back and get something that fits imo.
  • bones3027
    bones3027 Posts: 152
    I have a 2010 Reign and Im running a blackspire stinger which is pretty much the same shape, I positioned it so that it was flush against the outer portion of the link but not over the center bolt of the bush (not sure if that makes sense). The only drama I had was chain line which took a while to adjust, taking into count the stinger. Now it f@"%ing rocks no chain suck. so its probably the same as you positioned as the bottom linkage doesnt move anyway the rear triangle pivots of these. If you need pics I can get some tomorrow as shes stripped at the min ready for some grease!!!
    My Bikes
  • bamba
    bamba Posts: 856
    some pics would be great, thanks
    My Trance
  • bamba
    bamba Posts: 856
    Assuming i can get it to fit by some means with some clearance, how do i sort out the chain line ? ive had a good search around but cant find anything that describes what i have.
    the bb is a sealed shimano bb es25, 118mm in length, the thickness of the back plate is going to push every thing out by 2.4mm,there are no other spacers inside the housing,cant see how i can get the chain line shifted back.got a feeling the answer may be a new bb of some sort.
    My Trance
  • nicklouse
    nicklouse Posts: 50,675
    bamba wrote:
    Assuming i can get it to fit by some means with some clearance, how do i sort out the chain line ? ive had a good search around but cant find anything that describes what i have.
    the bb is a sealed shimano bb es25, 118mm in length, the thickness of the back plate is going to push every thing out by 2.4mm,there are no other spacers inside the housing,cant see how i can get the chain line shifted back.got a feeling the answer may be a new bb of some sort.

    what width bb? get an E type BB.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bamba
    bamba Posts: 856
    68mm, whats an E type bb ? external ?
    is the offset created going to make any problem ? apart from some adjustment of the front mech, or could i just put it together as it is
    My Trance
  • bamba
    bamba Posts: 856
    Ok ,so ive discovered what a e braket is in the absence of a reply,although cant find one with the right dimensions, i have seen a normal bb same as mine at 121mm instead of 118mm, so the back plate would take up 2.4mm leaving a gap of .6 to be spaced out, can any one tell me if this would work as this is bit of new area im delving into.
    would there be any thing wrong with just bolting it together as it is ?
    My Trance
  • bones3027
    bones3027 Posts: 152
    edited January 2011
    apologies for not getting back to you yesterday, have been strucked down with the worst case of man flu. so on further investigation my chain device isnt quit as large as yours however a riding buddy has a 2010 trance x4 and he has fitted a blackspire dewliehttp://www.chainreactioncycles.com/Models.aspx?ModelID=35815 and he said it rubs a little but works a treat and has no problem with chainline. Here is my set up ignore the scratches to the lower link these were from a serious case of chain suck. as you can see the third pic shows clearance of about .5 mmhttp://www.flickr.com/photos/43022311@N03/5333321926/
    My Bikes
  • nicklouse
    nicklouse Posts: 50,675
    bamba wrote:
    Ok ,so ive discovered what a e braket is in the absence of a reply,although cant find one with the right dimensions, i have seen a normal bb same as mine at 121mm instead of 118mm, so the back plate would take up 2.4mm leaving a gap of .6 to be spaced out, can any one tell me if this would work as this is bit of new area im delving into.
    would there be any thing wrong with just bolting it together as it is ?

    nope your chain line will be off by a bit. the axle moves when you use spacers.

    an option is a 73mm BB and a second 2.5mm spacer on the other side but your chain line may not be what you want.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bamba
    bamba Posts: 856
    Thanks for the pictures bones, what size bb are you running ?
    so the 68mm part reffers to the width of the frame part it sits into, by getting a 73mm bb with a 2.5 mm spacer plus the 2.4 of the backplate ( 68 + 2.5 + 2.4 = equals just about 73mm)
    is this the best option ?
    My Trance
  • bamba
    bamba Posts: 856
    can any one tell me if this is the correct spacer i need for the none drive side please,

    http://www.chainreactioncycles.com/Mode ... elID=36416

    as ive just had my previous attempt at ordering turn up, which was some thing totaly wrong,think i ordered a gusset spacer which goes inside the frame i think, not what i wanted
    My Trance
  • nicklouse
    nicklouse Posts: 50,675
    why do you need it?
    what have you bought?

    new BB? or....
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bamba
    bamba Posts: 856
    got a 73 mm bb on its way, so trying to get a 2.5mm spacer for the none drive side as you sujested above
    My Trance
  • cavegiant
    cavegiant Posts: 1,546
    I stuck a few washers between the device and the frame, but then I have Isis mounts, so not sure if you can do the same.
    Why would I care about 150g of bike weight, I just ate 400g of cookies while reading this?
  • nicklouse
    nicklouse Posts: 50,675
    bamba wrote:
    got a 73 mm bb on its way, so trying to get a 2.5mm spacer for the none drive side as you sujested above

    but depending on the BB there will be nothing to hold a washer on the none drive side.

    what BB?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bamba
    bamba Posts: 856
    does the washer not go between the outter cup and frame on the none drive side, in the same way that the tensioner will fit,in order to equal it all out,

    this bb

    http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 856wt_1139

    same as i took out but 73mm not 68mm
    My Trance
  • bamba
    bamba Posts: 856
    Finally got it all fitted up this evening, with a 73mm bb and a 2.5mm spacer on the non drive the side,took 1 link out of the chain,did originally take 2 out but the rear mech was at a silly angle in higher gears.
    Not quiet 100% happy with the device as when on the smallest chain ring the chain rides on the inner step of the pulley wheel,could do with being over to the center some more but other than bending the back plate there is no means to do this as position is dictated be the frame.
    Should the pulley be positioned to be in contact when using both chain rings or just the larger ? as this is when it will be effective ??
    My Trance
  • sniper68
    sniper68 Posts: 2,910
    bamba wrote:
    Not quiet 100% happy with the device as when on the smallest chain ring the chain rides on the inner step of the pulley wheel.
    Should the pulley be positioned to be in contact when using both chain rings or just the larger ? as this is when it will be effective ??
    That's how they run.On the larger ring it sits in the pulley wheel and on the granny ring it sits on the inner step 8)
    Lynskey R480

  • bamba
    bamba Posts: 856
    I see , didnt no that , thanks, good job i didnt try to bend it then.
    My Trance
  • bamba
    bamba Posts: 856
    few pics,will try to get a underside pic later,

    after some felting, to remove mounting lugs, was also slightly dished out on the back near the lower arm pivot to give a bit extra clearance,

    01022011013.jpg

    01022011015.jpg
    My Trance
  • sniper68
    sniper68 Posts: 2,910
    Having just washed my bike I've noticed a dirty-great-chunk of my bashguard is missing :roll: I felt something big hit the bike on my last ride!
    Had I have had a 3rd ring on there I reckon it would have been pretty well bent now :D
    Lynskey R480

  • bamba
    bamba Posts: 856
    Good excuse for a shop then :D

    some pics just to check about running on the edge of the pulley when in the lowest chain ring,

    03022011020.jpg

    03022011023.jpg

    And one last question, i think should the pulley wheel be contact with the bash ring ?
    Have left a tiny gap on mine for now.
    My Trance
  • nicklouse
    nicklouse Posts: 50,675
    should not touch.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • sniper68
    sniper68 Posts: 2,910
    Mine doesn't touch.I have a Blackspire stinger and the central groove on the pullywheel is much narrower than yours appears to be,so the edge that the chain runs on when in the granny-ring is also thicker.
    Lynskey R480

  • bamba
    bamba Posts: 856
    Another thought, would there be any benefit in lowering the front mech ?
    ive noticed the chain now runs on the bottom edge of the mech now im using the granny ring more, prevouisly only really used it in the 2 lowest gears so wasnt a problem.
    There's bit of a indent on the mech that would be in position on the large chain ring,if it was lower would this be a problem ?

    07022011041.jpg

    07022011042.jpg
    My Trance

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