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On a singlespeed, you can set up that Hussefelt guide so that it never actually touches the chain unless unless the chain is trying to go walkies.
Sounds like he needs guides next to the sprocket anyway, a la Alfine
it's still not deisgned for keeping a chain from jumping due to pedaling with a bad chainline on a flexy bike with long stays, crappy components and single speed. MTB guides are really meant to keep the chainfrom bouncing around when not pedaling and don't really experience much force. i don't think the problem is analagous. I think his problem is when he's pedaling.
same with that above guide, as it is guiding the bottom of the chain, which is slack, onto the cog.
either way it's a pricey fix for crappy mutant bike.
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^ actually scrap that the derailleur cable is too long, shit bike
it's correct.
you want the housing coming in to the mech barrel straight on with a fairly relaxed bend for two reasons. 1- a tight bend could theoritically hinder the cable sliding easily, especially under high tension. 2 - on shimano mechs (not sure about sram) there's a B spring which sets how far the top pulley is from the cogs. A tight bend in the extremely stiff shifter housing could interfere pulling the mech away from the cog.
The angle on this deraileur barrel and other newer ones necessatiates a longer cable.
if you really want shorter housing you can try with these. I've never used one so i can't say. seems like unneeded complexity.
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and equally as shocking is how much energy you put into being such a jackass.