KeithR
Well-known member
No, it could be both..!I either don't have this rattle on the gen 4 motor ..or my ears really are too fkd to notice ?
No, it could be both..!I either don't have this rattle on the gen 4 motor ..or my ears really are too fkd to notice ?
@Bearing Man Tried it today. Makes no difference on mine, you get the rattle with your feet off the pedals too. Alu framed bike.I have a theory but I need some feedback before I strip another Gen 4 motor. Can someone try going over a peace of ground that would normally cause the rattle but without their feet on the pedals? Obviously, do not pick a piece of extreme terrain that would end in certain death without feet on pedals. Also mind your plums! ? But feedback would be helpful for workshop testing ??
I agree, it would appear to be something to do with "chain slap" agitating the crank. Just need to get @Jamze to ride down the same hill without a chain onIt does seem that some bikes using the Gen 4 motor have the rattling noise whilst others do not..or at least it is far less noticeable. I believe the difference, apart from the acoustic effect of the frame material, must be in either rear suspension design, rear shock set up, or derailleur design......ie put together, the way in which the chainstays/drive train agitate the chain and therefore the chain ring.
Possibly. Mine is GX 12 speed. Yours is 11? The noise reminds me a bit of my bike with 3x gears. When you coast downhill on rough ground on that the chain rattles against the front mech cage. But on the Whyte, it's more of a knock from inside the frame/motor area.I have a Whyte like Jamze, but I can't say I detect anything I would deem an untoward rattle.
If it is something to do with chain slap agitating the crank, could it be influenced by different drivetrains and derailleur clutches?
A good analogy...I agree
My point is that maybe different drive trains, chain engagement, chain tension etc, exacerbates that backlash more than others.
Explaining when some people have it and others don't.
The e8000 did not rattle (much) the EP8 does, surely Shimano would not change the gog specs to create more backlash? I believe the disengagement over and beyond the motor assistance and the resulted reduction of drag (EP8 & Gen4) has more to do with the rattle?
After my bike had a service and I complained about it, this noises had decreased a lot, so I supose lot´s of this noises are cable and tightening bolts related, and not about the motor it self.
Agreed. I hear the same clunk when I first spin the chainring backwards when cleaning the chain.This noise I also have on my engine and it comes from the engine, when you take the plate in one hand and want to turn it back and forth I reproduce the noise, so it's good in the engine . At first it bothered me, but you get used to it.
Sounds feasible, but we have some Whytes that rattle, some that don't, and some that didn't but now do!and I believe that is due to differing rear suspension designs having more or less kick on the chain when coasting.
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