Unfortunately nothing I do seems to stop my Schlumpf hub from eating Moment cranks. By that I mean eventually a crank (on either side) will progressively move close to the frame to the point of almost touching it – at which time I replace the cranks rather than damage either myself, the frame or the hub. I am now onto my third pair of cranks, which is a concern as Moment cranks aren’t cheap.
This problem occurs regardless of whether I follow Schlumpf’s recommended (high!) torque settings for tightening the cranks on the ISIS hub or lower.
Why doesn’t this happen on all my other KH ISIS uni’s? One significant difference is that all single speed KH uni’s have spacers that the cranks end up riding hard against. The Schlumpf hub has no such spacers, so unless everything is perfect the ISIS Moment cranks appear to progressively deform, and slide further along the ISIS spline than they should. That’s my theory anyway!
It’s inconvenient – cranks must be checked each ride – costly and creates doubt while riding – is everything ok down there in crank land? The last thing a GUNI rider wants to have happen is some type of equipment failure at speed.
KH and Schlumpf have announced a revised version of the hub will be released in June, including improved bearings and axles that are 2mm longer. Will it be enought to solve the problem? not sure though it should improve it.
Florian has suggested a solution for the current hub is to mill material from the cranks, which is something I’m going to look into further.
All of that said, man I am loving the 36 GUNI! For all the teething problems If I had to have only one uni, this would be it!