* Custom Length Cranks available, call for prices.
Magnesium & Ti
Speed Play Frogs
Kid Back Conversions
Seat Tube Dia.
1 1/8" (Limited Quantity Available)
1 1/8" & 1 1/4" &
1 3/8" & 1 1/4"
1 3/8" (fits Santana)
*Complete conversions include bottom bracket shell with clamp, BB plus sizing shim, axle, crank set, 127mm arms, 36 tooth chain ring, long crank bolts, spacer washers and chain. Not sure? Call us. We are happy to advise, we have done many. Big Question: Are your cranks 74x110 or 130x74?) and
What size is your seat tube?
How do you know if your child
needs crank shortners or a Ride2 child kiddie crank conversion?
1) a rule of thumb - if the child is
7 years old they generally can use crank shortners, with the
stoker seat all the way down. An easy method for testing this -
lower the seat in the stoker position to the lowest point, then
have your child sit on the saddle with the crank in the down
position (if you have a shock absorber seat post remove it and
install a normal seat post first). If their foot intersects with at least half of the
crank arm in the down position they can use crank shortners.
They can enjoy Ride2 or Tandems East original crank shortners
until age 11 or 12.
2) Ride2 Child kiddie crank
conversion is generally used from age 3 1/2 to age 7. When
ordering it is important to know what type of crank you
presently have on your tandem, the bolt pattern of the chainring
(either 110 or 130 is most common). Also you need to know your
seat tube size. Ride2 kiddie crank conversion comes with the
ability to do 3 sizes; 1 1/8, 1 1/4 and 1 3/8. all hardware is
provided and it takes standard metric Allen wrenches to install.
Installation is usually a 45 minute job. If the child is just 3
1/2 they will need a longer stoker boom. which generally run
about $80. An inexpensive way to avoid the longer stoker
extension purchase is to flip over the handlebars. Ride2 kiddie
cranks can be purchased with 2 crank bolt patterns, standard 110mm
(for the very young rider) or 135mm for older children.
The ORIGINAL Crank
Shortners from Tandems East
Adjustable aluminum crank shortener
with English 9/16 x 20 threading. Also available in 1/2" for older
steel cranks $125 per pair. 2 minute installation. 4 positions,
redesigned with rounded corners. Fits many cranks. We have produced these for 20 years. Does not mar cranks.
$125 per pair Also available in a wider version. Shortens the crank length by 24mm, 41mm, 59mm & 76mm. Reduce cranks by 3” at the max. Wide version Fits Coda & Dimension cranks
$125 per pair
US Patent # 5743,546
unique cam system
(see below) - very soon black only
Standard or Wide Width
How to order
the proper Crank Shortner
Check the width of your
crank by measuring down about 3" with your digital caliper
(click here for purchase info) or use the poor man's caliper
(see info here). The photo below shows a crank 37.6mm wide,
this crank will work with either the Tandems East Original
Wide Crank Shortner or the Ride 2 Wide Crank Shortner.
Tandems East Original
In the photo above you
can see that the Tandems East Original Wide Crank Shortner
uses stainless steel screws with nylon tips to eliminate
Wide Crank Shortner
Ride 2 uses an
eccentric cam system to take up slop. Will fit cranks up to
37.5mm or a hair wider. Easy to install with a 5mm Allen
wrench and a 10mm open end or socket wrench, these are used
to tighten eccentrics. A small bottle of LocTite is
provided for the 5mm stainless steel socket bolt (must be
applied by installer).
This item is generally
used by children 7 to 11 years old.
In the photos above,
the Ride 2 Wide Crank Shortner is installed. Notice how cams
press up against crank arm to eliminate slop.