DrkAngel
1 GW
I started with a 2008 EZip Trailz ... several years ago ...
I keep coming to the point of outgrowing it!
But ... I keep coming up with "improvements" that prolong it's usefulness.
1st I found a 16T compatible freewheel, this allowed a 20mph cruising speed, up 25% from oem.
20 mph Upgrade - $20
2nd I developed high capacity - long range Li-ion battery packs, recycled from laptop batteries.
Homemade Battery Packs
Now my eZip provides cruising at 22mph, with some assist till near 25mph.
Sadly, I need to jump in front of, and try to stay ahead of, 30 mph traffic!
While my eZip helps me get up past 22mph, above about 24 mph it is all me, humping along, dragging a heavy bike.
So ... I decided to re-gear for higher speed.
Motor side freewheel sprocket is at it's limit with the 16T, so increasing the motors sprocket is the other method.
(Increasing voltage would accomplish my goal ... but that is another story.)
I've never been able to find a Plug-n-play component.
Finally I came across a good candidate.
Best of all it might require only minimal modification!
"Drive Sprocket 12 teeth for #410 Chain"
Click on Picture!
$23.99/shipped
Multiple items cheaper from fancyscooters.com.
"Drive Sprocket 12 teeth for #410 Chain"
Most important ... the 11mm ID should fit perfectly.
"Spaces" might be easily modded to the 4mm needed, for the "key".
Small file work might suffice?
Probably easier to modify "key".
Projected "no load" speed will be 33.3mph.
Placing , my target , 30mph speed (90% of no load speed), near the end of the effective power curve.
______________________________________________________________________
Received my 12T upgrade candidate.
The all important 11mm ID seems usable - 11.07mm - can't get much closer to perfect.
2 factors require modification.
1. Width of the body.
OEM is 9mm, the replacement is 12mm.
3mm removal with grinder seems easy enough.
Shaft is long enough to allow no mod.
But ... gauged resizing would allow precision sprocket alignment!
2. The inner shaft grooves are 3mm in width, the 4mm "key" requires a wider "keyway".
Solution - rather than attempt an extremely difficult internal resizing of the sprocket, I will break out my dremel tool and grind the appropriate 1mm from one edge of the key.
Should be fairly simple to accomplish.
______________________________________________________________________
Key - modded
Fits nicely
9T vs 12T
Just gotta slap it on a bike and take er for a spin.
Jammed up a toe & real busy. .
Want to be in good shape for assist trials.
.. but will provide details-results soon!
I keep coming to the point of outgrowing it!
But ... I keep coming up with "improvements" that prolong it's usefulness.
1st I found a 16T compatible freewheel, this allowed a 20mph cruising speed, up 25% from oem.
20 mph Upgrade - $20
2nd I developed high capacity - long range Li-ion battery packs, recycled from laptop batteries.
Homemade Battery Packs
Now my eZip provides cruising at 22mph, with some assist till near 25mph.
Sadly, I need to jump in front of, and try to stay ahead of, 30 mph traffic!
While my eZip helps me get up past 22mph, above about 24 mph it is all me, humping along, dragging a heavy bike.
So ... I decided to re-gear for higher speed.
Motor side freewheel sprocket is at it's limit with the 16T, so increasing the motors sprocket is the other method.
(Increasing voltage would accomplish my goal ... but that is another story.)
I've never been able to find a Plug-n-play component.
Finally I came across a good candidate.
Best of all it might require only minimal modification!
"Drive Sprocket 12 teeth for #410 Chain"
Click on Picture!
Multiple items cheaper from fancyscooters.com.
"Drive Sprocket 12 teeth for #410 Chain"
Most important ... the 11mm ID should fit perfectly.
"Spaces" might be easily modded to the 4mm needed, for the "key".
Small file work might suffice?
Probably easier to modify "key".
Projected "no load" speed will be 33.3mph.
Placing , my target , 30mph speed (90% of no load speed), near the end of the effective power curve.
______________________________________________________________________
Received my 12T upgrade candidate.
The all important 11mm ID seems usable - 11.07mm - can't get much closer to perfect.
2 factors require modification.
1. Width of the body.
OEM is 9mm, the replacement is 12mm.
3mm removal with grinder seems easy enough.
Shaft is long enough to allow no mod.
But ... gauged resizing would allow precision sprocket alignment!
2. The inner shaft grooves are 3mm in width, the 4mm "key" requires a wider "keyway".
Solution - rather than attempt an extremely difficult internal resizing of the sprocket, I will break out my dremel tool and grind the appropriate 1mm from one edge of the key.
Should be fairly simple to accomplish.
______________________________________________________________________
Key - modded
Fits nicely
9T vs 12T
Just gotta slap it on a bike and take er for a spin.
Jammed up a toe & real busy. .
Want to be in good shape for assist trials.
.. but will provide details-results soon!
