My Leaf came with such short axles that it was a challenge to mount torque arms on both sides. I ended up going with a 6 speed freewheel and a narrower inside washer to gain enough clearance for the torque arms on that side.
Last edited:
Leaf / leafmotor / leafbike high efficiency 1500w motor
- Thread starter neptronix
- Start date
yantra yatra
100 W
For some reason I only ended up with one Grin torque arm. I'm not sure if that will be enough. Are two advisable or necessary for 3000w-5000w? I'll see how the Shimano groupset goes anyway. May need to go to 6s in future
The Toecutter
100 kW
- Joined
- Feb 8, 2015
- Messages
- 1,468
I got away with one arm on the non-pedal-drive/left side by disabling regen at 1500W. With regen, I absolutely needed one on both sides. With just the left arm, the regen caused the axle to rock back and forth in the dropouts and I lost an axle nut as a result.
LInk still doesn't work; same error. Copy and paste the actual page itself to your post, not the link.
If you only use one torque arm, use it on the solid axle side, the one without the wires. If you use it on the wire side, the axle is weaker, and the rocking it might do with only that side locked down will cyclically stress that weaker spot. Some people have had axles of various kinds of motors break there from that.
If you only use one torque arm, use it on the solid axle side, the one without the wires. If you use it on the wire side, the axle is weaker, and the rocking it might do with only that side locked down will cyclically stress that weaker spot. Some people have had axles of various kinds of motors break there from that.
yantra yatra
100 W
Dunno how to get that Ali link to work but for anyone looking for a groupset I got the one called
SHIMANO Tourney 7 Speed Groupset include M315 Shifter TY300 Rear Derailleur HG200 TZ500 Cassette Sprocket 28T 34T HG71 Chain
It sounds like this may not work after all though with two torque arms (I’d like to use regen) so may have to look again for a 6s or 5s option.
SHIMANO Tourney 7 Speed Groupset include M315 Shifter TY300 Rear Derailleur HG200 TZ500 Cassette Sprocket 28T 34T HG71 Chain
It sounds like this may not work after all though with two torque arms (I’d like to use regen) so may have to look again for a 6s or 5s option.
Even the links google finds for that description give the same error.
Searching with that phrase direclty on aliexpress finds quite a few things, no idea which one is the one you're looking at.
If you copy the actual information from the page, picture, etc, and paste it into your post we could see it and tell you what it is.
Searching with that phrase direclty on aliexpress finds quite a few things, no idea which one is the one you're looking at.
If you copy the actual information from the page, picture, etc, and paste it into your post we could see it and tell you what it is.
yantra yatra
100 W
SHIMANO Tourney 7 Speed Groupset
Groupset include 4 original (no box) parts：
1.SL-M315-7R
2.RD-TY300-SGS
3.MF-TZ500-7 / CS-HG200-7
4.CN-HG71
MF-TZ500-7
SHIMANO TOURNEY TZ - Multiple Freewheel - HYPERGLIDE - 3x7-speed
--Lightweight construction
--Easy assembly feature
--Combination 14-16-18-20-22-24-28T - 14-16-18-20-22-24-34T
If this doesn’t work will find a 5 or 6s
Groupset include 4 original (no box) parts：
1.SL-M315-7R
2.RD-TY300-SGS
3.MF-TZ500-7 / CS-HG200-7
4.CN-HG71
MF-TZ500-7
SHIMANO TOURNEY TZ - Multiple Freewheel - HYPERGLIDE - 3x7-speed
--Lightweight construction
--Easy assembly feature
--Combination 14-16-18-20-22-24-28T - 14-16-18-20-22-24-34T
If this doesn’t work will find a 5 or 6s
Ok, that looks like a "standard" thread-on freewheel, that should fit any thread-on sidecover or regular bike hub.
I don't see info on it's width, but if it's like most 7-speeds, it'll be somewhere around 32-35mm. As long as oyu have that much clearance from the side cover (plus the gap between the lowest gear and the cover) out to your dropout's inboard face, plus the width of the chain past each sprocket when it's riding on the outer and inner ones, it should fit.
(assuming no spacer washers, the distance from the sidecover to the axle shoulder that would rest against hte dropout is equivalent to the above distance)
Also, while it could be "real", I don't know that it will actually be Shimano, just as likely to be a clone of whatever level of quality / materials. (a common problem on many websites, not just Ali*). Some of the stuff I've gotten there was alright even when it obviously wasnt' the real thing, and some of it was useless garbage.
I don't see info on it's width, but if it's like most 7-speeds, it'll be somewhere around 32-35mm. As long as oyu have that much clearance from the side cover (plus the gap between the lowest gear and the cover) out to your dropout's inboard face, plus the width of the chain past each sprocket when it's riding on the outer and inner ones, it should fit.
(assuming no spacer washers, the distance from the sidecover to the axle shoulder that would rest against hte dropout is equivalent to the above distance)
Also, while it could be "real", I don't know that it will actually be Shimano, just as likely to be a clone of whatever level of quality / materials. (a common problem on many websites, not just Ali*). Some of the stuff I've gotten there was alright even when it obviously wasnt' the real thing, and some of it was useless garbage.
yantra yatra
100 W
Thanks for the good info! Hopefully this can be useful to others looking for compatible parts.
I have one Grin V7, to get another with shipping is extraordinarily expensive so will prob get a cheaper one, like this Suringmax one, or a generic cheap one. Arc also make a nice one mid range price.
Suringmax also make a 1500w 135mm direct drive. I reckon it would make a good backup bike motor, would be interested to see its performance with statorade
I have one Grin V7, to get another with shipping is extraordinarily expensive so will prob get a cheaper one, like this Suringmax one, or a generic cheap one. Arc also make a nice one mid range price.
Suringmax also make a 1500w 135mm direct drive. I reckon it would make a good backup bike motor, would be interested to see its performance with statorade
It's never a good idea to cheap out on torque arms.
Remember that pretty much all the clones of grin's torque arms (such as the one you show) are almost certainly much less precisely made, so they don't perfectly fit the axle, and allow it to move. So...they don't really do the job they're there for.
If you have some scrap metal (steel) of appropriate thickness (thicker better for spreading load over more axle flat surface area) and a drill and a file and a lot of patience, you can create your own perfectly fitting TA that is better than that, by drilling a hole in the metal then filing that outward until you can *just barely* fit it onto the axle and there is no gap on either axle flat.
There are many ways to make TAs, you can look at many of them in The Torque Arm Picture Thread.
If you have some scrap metal (steel) of appropriate thickness (thicker better for spreading load over more axle flat surface area) and a drill and a file and a lot of patience, you can create your own perfectly fitting TA that is better than that, by drilling a hole in the metal then filing that outward until you can *just barely* fit it onto the axle and there is no gap on either axle flat.
There are many ways to make TAs, you can look at many of them in The Torque Arm Picture Thread.
