Vinny I have a Dengfu E06, 29+ late spring/summer set with a pair of 26" 90mm Nexties shipping out this week to build up a fat set for the snow, using the Christini fatbike spider. The 50T chainring
definitely needs some spacers to offset it out by at least 5mm as it just barely clears the chainstay & I don't like tight clearances, but the 40T is fine. Or do you mean the chain on the chainstay? Checking the fit, I should have about 15mm between chain & chainstay when the suspension is fully extended (more when compressed) with the 30T, I have at least 20mm with the 40T. I'm going to keep the clutch on my derailleur a little tight but I'll see if I wind up needing a chain guide.
Before Kindernay broke my heart & said no more fat hubs, I wanted to design & print a belt tensioner the fits using the M620 mounting bolts and takes up slack from the bottom of the chainring, ala Nicolai. Gates is super touchy with tension but there are a couple other belt drives that are a little more forgiving in their chainline/tension demands that makes them easier for full suspension. If WW wants to take a crack at long travel full-suspenion + belt drive then it might be easier for them to develop something using a V-belt (I forget the other guys out there, but there are a couple).
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KW definitley let us know how the Garbaruk works. I think through the right chainring + cassette combo, and programming the different assist levels/limits on the X1 you should be able to avoid skipping, get good range, and not maul your cassette - through mindful shifting of course too. I saw another user do something cool with a 3D-printed 'e-clutch' that was essentially a thumb-operated ebrake switch to cut motor power while shifting, since shifting is definitely what causes the most wear. I'm super interested in this and since I want to keep the HC levers on my MT7 brakes I'm going to try to rig up an ebrake + eclutch system using Grin Tripwires - design the switch so it bolts on right above the dropper lever, or is a trigger behind my left brake lever.
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