Sprocket mounting bolts

Discussion in 'Hubs, Gearboxes, Sprockets and Chains' started by btfx, Jul 20, 2011.

  1. btfx

    btfx New Member

    Jul 20, 2011
    Likes Received:
    I'm wondering what the common setup is for the cheap engines people sell online. What diameter bolt I should use and if/where I need washers or lock washers.

    I bought a 66/80cc kit online and didn't get any bolts for it. Went to a hardware store and bought three 1/4" x 1.5" nuts/bolts to hold it together while I put everything else on. I noticed the 5/16" bolts didn't quite fit through the sprocket and mount. I don't know if it's worse to wear the sprocket and mount by threading it with the bigger bolts or potentially loose mounting with smaller bolts, so I decided to ask here.

    I couldn't find that detail in any of the places that sell the sprocket mounting set.
  2. Goat Herder

    Goat Herder Gutter Rider

    Apr 28, 2008
    Likes Received:
    '''The standard kit sprocket bolts are 6 mm 1.0.
    so just use 1/4 20 bolts with lock washers and nylock nuts
    are a good idea too.

    If you have a coaster brake you can get flat head 1/4 20 bolts and
    countersink the holes so the bolt heads are flush with the sprocket'''.

    ''I will add''

    In a great many cases two set of holes will let you flip a sprocket and have counter sunk holes for both directions. However most folks mount their kit sprockets with the beveled side facing out for better tire clearance. Depending on frame clearance etc the sprocket can be run both ways.

    Here is one tutorial on the kit sprocket and the rag joint for coaster brake set up.



    If there are any questions please feel free to ask BTFX! There are no dumb questions here ever just questions you have not asked us yet. We all start from somewhere. Their are ton's of folks on this forum who love to help.
    #2 Goat Herder, Jul 20, 2011
    Last edited by a moderator: Jul 20, 2011

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