• First, when I fit the spider to the axle and tighten up the right crank, the spider is slightly loose even when torqued right up.

    To the full 35Nm? Tapered splines are very sensitive to assembly force, so you are unlikely to get full clamping pressure on the spider until full torque is applied.

    It feels like I need a wider BB.

    Have you definitely got the standard axle rather than the offset axle?

    The offset axle would require 2.5mm each side which sounds like it would solve your issues.
    Spacer chart

  • Thanks. I don't have a torque meter that goes that high, but it's as tight as I can get it. Thing is that if I get it any tighter it just pushes the chainrings too far in so they hit the chainstay. It needs something to hold it out on the right chainline.

    I am pretty confident I don't have the offset. I actually have two axles (ordered one over Christmas and it took forever so ordered another as got sick of waiting!). What I could do is see if the other one works.

    I have checked the spacer chart and it says I only need the little 0.5mm ones, which is all that I have, so can't try something else to see if it works. That was what made me think of BB width, as I held a shimano one against it and that seeemed to be a mm or two thicker.

  • What BB do you have? Are you sure it's not missing any cover caps? How much is the spider hitting the chainstay? Like, just touching or is there still visible space between the spider and the BB once it makes contact?
    BBs should be the same width once fully assembled with the correct spacers.

About

Avatar for frank9755 @frank9755 started