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No part of this site may be reproduced or
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without permission in writing from the publisher.
By appointment only!
Scott MacGregor
Plainville, MA 02762
Phone: (508) 695-3717
Fax: (508) 643-0233
Gearing Options for Bikes
and Scooters
Currie, Lashout, and ElecTrec bikes or scooters can be made faster,
slower,
better hill
climbers, longer range, or just about anything you
choose
with the
installation of custom batteries, motors, and sprocket
sets.
The
following is a partial list of sprocket (gear ratio) options available
from
EVdeals. The possible combinations of motors, sprockets, and
batteries is too large to present clearly on this site, so I urge you
to
call if you have questions or don't see what you have in mind.
Index
Motor shaft
sprockets (pinions)
Ring Sprocket vs Pinion
(Currie, Lashout, & ElecTrec Bikes)
Setting chain length for
custom sprockets
Effect of using alternative motors
Rad2Go Sprockets
A Final Word
Custom Sprockets & Crank sets
Motor shaft sprockets (USPD & Lashout Scooters & Bikes)
Practical Possibilities using
standard motors
(MPH with 165lb rider)
|
13T(no clutch) |
15T | 17T | 19T | 21/22T | |
| Scoot-e | 11 | 13.5(s) | n/a | n/a | n/a |
| Phantom | 11 | 13.5(s) | n/a | n/a | n/a |
| Flyer 2001 | 13.5 | 15.5(s) | 17.0 | 18.5 | 20.0* |
| Flyer 2002 type | 15.0 | 17.0(s) | 18.5 | 20.0 | 21.5* |
| F-18 type | 13.5 | 15.5(s) | 17.0 | 18.5 | 20.0* |
| Tsunami type | 13.5 | 15.5(s) | 17.0 | 18.5 | 20.0* |
| USPD,
Currie Pro-Drive 26"-27" wheel |
n/a | 13.0 | 15.0 | 17.0(s) | 18.5/19.5(x) |
| Lashout, ElecTrec Bike 26"- wheel | n/a | 13.0 | 15.0 | 17.0(s) | 18.5/19.5(x) |
n/a means "forget it!"
(s) means stock gearing
* means not recommended except with
extremely light riders
(x) chain tightness
issues may dictate 21T or 22T choice. (call)
Stock replacement sprocket/clutch
assemblies
(s)
$29
(re-built)
Stock replacement sprocket/clutch assemblies
(s)
$39
(new)
Custom
sprocket/clutch assemblies
(13T-21T)
$59
Other custom assemblies not shown
above-Call 508-695-3717
NOTE:
Speeds indicated above are approximate, and
depend
heavily on factors such as tire pressure, wind, hills, road
surface, rider weight, etc.
BACK TO TOP
Currie
USPD Lashout
Multi-sprocket cranks
Custom crank rings
(mixed chain sizes) (up
to130 teeth #25)
Ring Sprocket / Pinion
(Currie, Lashout, ElecTrec)
Possible Combinations of Pinion and Ring Sprockets
using
silver can
Currie motor and 26"-27" wheel.
(MPH with 165lb rider)
| 15T | 17T | 19T(stock) | 22T | |
| 48T | 14.9 | 17.2 | 19.0 | 21.0 |
| 54T(stock) | 13.0 | 15.0 | 17.0 | 20.0 |
| 60T | 11.0 | 13.4 | 15.2 | 18.5 |
Green = ring sprocket teeth
Red = pinion teeth
Bold =
most
practical alternatives to stock ratio
Blue = stock
USPD
(Currie) stock
replacement ring sprocket
54T-
$25
USPD
(Currie) custom ring sprockets,
48T-$54
60T-$59
Lashout & ElecTrec
stock ring sprockets
54T - $25
Lashout & ElecTrec
custom ring sprockets
48T- $54
60T- $59
Chain ring sprockets &
stoker crank sets
Call for pricing
For other custom sizes not shown
above - Call 508-695-3717
NOTE: For specific
applications involving smaller and larger
wheels,
please call. (508-695-3717)
Effect of using alternative motors
The tables above were derived using a
combination of empirical testing
and extrapolation. Your results will vary depending on many factors, but
should be surprisingly close to those indicated.
In addition to gear ratio changes, you may
also want to consider changing
or upgrading your motor to any one of the alternatives listed on this site.
(see motors) To estimate the performance of these
optional motors, just
follow the instructions outlined below.
|
Motor |
Correction Factor |
|
Silver Can MAC (24V) |
no correction needed, use table values |
| Finned BMC 400W (24V) | no correction needed, use table values |
| Hi-Kol 400W (24V) | subtract 1.5 MPH from above tables** |
| BMC 600W (24V) | subtract 1/2 MPH from above tables** |
| BMC 600W Plus (24V) | add 4 MPH to table values |
| 36V Hi-Kol modified motors | add 6 MPH to table values |
| 36V Super-BMC 750 motor | add 6 MPH to table values |
| 48V Super BMC 750 motor | add 12 MPH to table values |
**Don't be surprised
that the standard 600W motor shows 1/2 MPH
slower in the chart above. These motors develop the highest torque
and
efficiency at lower RPM than the smaller motors. However,
since they can
be geared higher without overheating, they will
always be your
best choice for high speed applications. This is
especially true
in hilly terrain and with heavy riders.
BACK TO TOP
Custom gearing for
Rad2Go 600 and 800 Watt motors made to order.
13 or 15 tooth with roll pin, ready to install
$30
17 or 19 tooth with roll pin, ready to install
$35
Before ordering any of the motors or
gearing options, please call for
a brief consultation. Matching your particular needs to a specific motor
and gearing combination can be difficult, especially in situations where
non-standard conditions prevail such as odd wheel sizes, unusual road
conditions, special needs and heavy riders.
(508-695-3717)