transmission drag, chain tensioner angle

mxc235

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Jul 18, 2018
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t belt creates a lot of resistance, no matter whether it is loose or tight; i think it wont even go downhill, pedalling is not an option at all. also in such mode transmission parts would wear quickly. when bike is going under inertia bottom line of chain is stretched, putting strain on the plastic roller of tensioner, which is only to give chain slight support when top is stretched. it seems that motored bike could only be used with freehub on the left side. what is lifespan of transmission if used without freehub? how hard does bike move?

chain tensioner roller is out alignment with chain line about 30 degrees. how do you solve this?
 

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Old Busted Hotness

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Jul 2, 2018
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What he said. Bend the bracket til it lines up.

A lot of the resistance you feel is just cold weather. Chain lube is thick, and there's a hundred joints in the chain. It'll free up a lot in warm weather. Also, how tight is your chain? Loosen up the chain tension and see if things free up. You should have about a half inch of slack in the top run.

If the resistance is in your belt drive, give it a once-over to make sure everything's running nice and free. Some resistance is normal, but you should be able to push the bike easily, with just a little resistance. If you can't pedal it, something's binding. Start with the chain and work your way forward.
 

mxc235

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Jul 18, 2018
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i dont know how people ride on it 60 kmh, i would say 15 is a max, so you can fall off bike and hope you are safe.

there's no way to use it without chain tensioner? this part is just something; chinese engineers could have put just a tiny bit of effort in designing it. im scared to think what happens if chain comes off or something goes wrong with one of the bolts...

i dont want to bend; im trying to wrap copper wire and clamp between those plates; is it a bad idea?
 

mxc235

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Jul 18, 2018
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this thing just rotates no matter how much you tighten it; with too much force there could be damage to frame or bolts; it is more or less firm only in one position - but thats not in alignment with chain even in this plane, not talking about the other; did the one who designed it have in mind possibility of adjustment? at least 4 bolts are needed. did they even test before producing in million numbers?

if there were 4 bolts there would be a way to put something under it and adjust angle, plus secure clamping.
 
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mxc235

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Jul 18, 2018
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as i see this chain is very likely to coming off, a small misalignment of tensioner roller is enough, or for no reason. when it does at speed what will happen? engine cant be stopped instantly, so for some time it will continue moving chain, meanwhile the rest can get tangled and lock the wheel. have you experienced this? would freewheel help? do any of you use hub with freewheel?
on ordinary bicycle no matter what happens with chain it does not affect you safety at all.
 

CrazyDan

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Jul 9, 2016
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If you are scared of the chain tensioner then get a shift kit. the chain wants to run straight but most chainstays are diagonal. The best remedy has already been mentioned, I like to use an adjustable crescent wrench to twist the tensioner to allow for a straight chain run.
 

mxc235

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Jul 18, 2018
Messages
65
the weak point of this chain transmission is this: if for some reason it decides to get on top of teeth, all system becomes in big tension: drive sprocket, tensioner, rear sprocket. it cant come off yet, because of not enough room;so it will break (bend) the weakest link - drive axle or tensioner roller (axle). at this moment wheel can be blocked or if chain comes off, later when wrapped around axle. if it is made intentionally loose (to allow it come off if it decides so, without damaging parts) it may increase chances of coming off.
freewheel can help in that when you are coasting you can feel safe for the chain because it is not moving.
is it a general flaw of the system with fixed tensioner? how is it on other types of machines (motocycle, ect)?
have you experienced chain coming off and what happened?
 
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