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advice between MF-TZ30 vs MF-HG40

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advice between MF-TZ30 vs MF-HG40

Old 03-17-21, 11:02 PM
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first trip
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advice between MF-TZ30 vs MF-HG40

HI i m building an electric bike and i must go from 7 speed to 6 speed because the motor takes too much space. i need megarange

i m thinking about alivio since it looks like a good quality price . what is the difference between MF-TZ30 vs MF-HG40?
if there is a 6 speed freewheel on aliexpress of a bit better quality could you also show it to me?

tx

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Old 03-18-21, 11:58 AM
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AliExpress is not a place for quality but freewheels are not really quality items anymore now that we have cassettes which are much better. The only quality freewheels these days are either NOS (or restored by someone like pastorbobnlnh ) or from IRD but I don't think any of them are really designed to handle the torque of a hub drive.
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Old 03-18-21, 02:26 PM
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Originally Posted by veganbikes View Post
AliExpress is not a place for quality but freewheels are not really quality items anymore now that we have cassettes which are much better. The only quality freewheels these days are either NOS (or restored by someone like pastorbobnlnh ) or from IRD but I don't think any of them are really designed to handle the torque of a hub drive.
A hub motor exerts no extra force on the rest of the drivetrain. One of its advantages over a mid drive setup
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Old 03-18-21, 02:50 PM
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The TZ-30 is the lowest level.
IF you can find them in 2 different tooth counts, you might buy 1 ea. and see what works best.
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Old 03-18-21, 09:09 PM
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Originally Posted by first trip View Post
HI i m building an electric bike and i must go from 7 speed to 6 speed because the motor takes too much space.

tx
the 7 speed freewheel is barely ~3mm thicker than the 6 speed.
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Old 03-18-21, 09:52 PM
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The MF-TZ30 is the lowest level. MF-HG40 is slightly better but in practice there's little difference. Either will last many thousands of miles unless you intend to ride the bike stomping on the pedals all the live long day. Since it's an E-bike I don't think that's what you intend to do.
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Old 03-19-21, 05:20 AM
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You might also consider a standard 6-speed freewheel (vs. the MegaRange one). With the torque of an e-bike motor, you may not find that you need the super low drivetrain ratios.
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Old 03-19-21, 07:00 AM
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Originally Posted by hokiefyd View Post
You might also consider a standard 6-speed freewheel (vs. the MegaRange one). With the torque of an e-bike motor, you may not find that you need the super low drivetrain ratios.
I was thinking the same thing
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Old 03-20-21, 09:30 AM
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Originally Posted by hokiefyd View Post
You might also consider a standard 6-speed freewheel (vs. the MegaRange one). With the torque of an e-bike motor, you may not find that you need the super low drivetrain ratios.
what would be the advantage of getting a non megarenge? on see only benifit from having the possibility of going slower stronger.
tx
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Old 03-21-21, 01:00 PM
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Originally Posted by first trip View Post
what would be the advantage of getting a non megarenge? on see only benifit from having the possibility of going slower stronger.
tx
There are a few mechanical advantages. One is a smoother transition from the largest sprocket to the next smallest. The MegaRange freewheel has a 14-16-18-21-24-34 tooth count; that's 10-tooth gap between the largest and next is pretty big. A regular model has a 14-16-18-21-24-28 tooth count, meaning the shift to the largest will be much smoother. Additionally, you can typically get crisper and smoother rear shifting when the jockey wheel on the derailleur is closer to the sprockets. With such a large sprocket on the Megarange model, your derailleur will have to be adjusted so that it doesn't track very closely in the middle of the freewheel's range.

The super low ratios generally aren't as useful with e-bikes since the motor can assist with getting you started. Of course, I'm not saying there isn't a scenario where it wouldn't be useful, but those situations are generally fewer and farther between with e-bikes.
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Old 03-22-21, 08:30 PM
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Originally Posted by hokiefyd View Post
There are a few mechanical advantages. One is a smoother transition from the largest sprocket to the next smallest. The MegaRange freewheel has a 14-16-18-21-24-34 tooth count; that's 10-tooth gap between the largest and next is pretty big. A regular model has a 14-16-18-21-24-28 tooth count, meaning the shift to the largest will be much smoother. Additionally, you can typically get crisper and smoother rear shifting when the jockey wheel on the derailleur is closer to the sprockets. With such a large sprocket on the Megarange model, your derailleur will have to be adjusted so that it doesn't track very closely in the middle of the freewheel's range.

The super low ratios generally aren't as useful with e-bikes since the motor can assist with getting you started. Of course, I'm not saying there isn't a scenario where it wouldn't be useful, but those situations are generally fewer and farther between with e-bikes.
ok tx for the clarification .
even if it will have a hub motor, i , ll only use it to go up hills so not so often . At least that is the limit i give myself.
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