Ortho Pedal Crank Arm Shortener

(14 customer reviews)

$89.00$159.00

Brand: Ortho Pedal

The Crank Arm Shortener (also known as a bicycle crank length adapter) offers different pedal positions to assist cyclists with limited knee or hip flexion, or simply with shorter legs.

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Brand: Ortho Pedal

Description

The Crank Arm Shortener from Ortho Pedal™ provides adjustable crank length for cyclists with limited knee or hip range of motion or those who struggle with knee pain and discomfort caused by longer cranks. There are four different pedal settings available, which can reduce crank length by 24mm, 41 mm, 59 mm or 76 mm.  Reduced crank length or shorter cranks can be beneficial for cyclists beyond those who require it as part of rehabilitation.

Crank Arm Shortener Features and Benefits

  • Manufactured in the USA from high-grade aluminum alloy into an attractive shape that easily bolts onto your existing bicycle crank.
  • Handcrafted stainless steel bolts provide strength and durability
  • Unlike other bolt-on products, the Crank Arm Shortener from Ortho Pedal will not mar or damage cranks
  • Initially constructed as a recovery and orthopedic device but can be applied to adapt crank length easily compared with replacing an entire bicycle crank
  • Crank arm length can be adjusted as range of motion increases during a recovery process
  • Useful for cyclists with short inseams (under 80cm) who would benefit from turning a smaller radius to resolve or prevent knee pain.
  • Pivotal for cyclists with limited lower limb range of motion due to injury or surgery
  • Reduces stress on the knees and hips
  • May reduce pain or discomfort
  • Installs in 10 minutes

Model Choices

Standard: This model fits cranks from 5/8″ wide to 1-1/8″ wide. This typically applies to steel cranks and “older style” aluminum cranks, common on some brands of stationary indoor exercise bike.

Wide: This model fits cranks over 1-1/8″ wide to 1-3/4″ wide. This typically applies to “new style” aluminum cranks, used on most modern bikes, and the Peloton bike.

NOTE 1: If your pedals are an older style with flats requiring a pedal wrench for removal and installation, you will need a pedal wrench to move your pedals from your existing crank arms onto the crank arm shorteners.  This wrench is NOT included.

NOTE 2: If you have an older style stationary exercise bike or kids bike, it may have pedals with 1/2″ axles which is smaller than standard.  To connect the crank shortener to your existing crank you will need the optional 1/2 bolt  (1 per side), available here.

NOTE 3: The use of this product will increase the stance width of the cyclist, equivalent to the width of the crank arm on each side.

Compatibility

  • Standard 9/16″ pedal axle holes   (or 1/2″ pedal holes by purchasing the optional 1/2″ bolts)
  • Suitable for use on regular bicycles, e-bikes, and indoor exercise bikes such as the Peloton bike

What’s in the Box?

  • Set includes both left and right-side adapters and hex wrenches for installation and adjustment.
  • Hex wrench specs are: 5/16″ for attaching the main retaining bolt to the crank arm hole, and 3/32″ for securing the grub screws on the sides.
  • Click here for Orthopedal installation instructions

Specifications

  • The Standard model weighs approximately 265 grams (per set)
  • The Wide model weighs approximately 295 grams (per set)
  • Reduces crank length by 24mm, 41 mm, 59 mm or 76 mm
  • Standard 9/16″ pedal axle holes

Original Development and Why it Helps with Rehabilitation

Crank arm shortener on bikeThe Ortho Pedal™ (Crank Arm Shortener) solves a problem many people with arthritis cope with, or people who have had knee surgery experience: the inability to ride a bicycle due to limited range of motion.  The problem is solved by reducing the amount of knee bending required, which is achieved by moving the pedals closer to the crank.  A smaller circle requires less motion and this can allow people with knee pain to exercise within their tolerance range of motion more effectively while providing a cardio workout!   Crank arm shorteners typically fit people with range limitations down to 60 degrees of flexion and 20 degrees of extension.  Many people who are planning to have Total Knee Replacement Surgery order them in advance to be ready to use when they come home after surgery.   There are many other uses including physical disabilities, adolescent racers, adaptive sports participants,  etc…

Additional information

Weight0.9 lbs
Dimensions8.5 × 5.3 × 1.6 in
OPTIONS

Standard – Pair, Standard – Right only, Standard – Left only, Wide – Pair, Wide Right only, Wide – Left only

14 reviews for Ortho Pedal Crank Arm Shortener

Customer Images

Image #1 from Stephen H.
Image #2 from Stephen H.
Image #3 from Stephen H.
Image #4 from Stephen H.
Image #1 from Stephen H.

Stephen H.

High quality.perfect fit.easy to install.now I am able to pedal my bike with my limited knee range of motion.

(0) (0)
Image #2 from Stephen H.

Stephen H.

High quality.perfect fit.easy to install.now I am able to pedal my bike with my limited knee range of motion.

(0) (0)
Image #3 from Stephen H.

Stephen H.

High quality.perfect fit.easy to install.now I am able to pedal my bike with my limited knee range of motion.

(0) (0)
Image #4 from Stephen H.

Stephen H.

High quality.perfect fit.easy to install.now I am able to pedal my bike with my limited knee range of motion.

(0) (0)
Image #1 from Stephen H.
Image #2 from Stephen H.
Image #3 from Stephen H.
Image #4 from Stephen H.
4.7 Rating
1-5 of 14 reviews
  1. Verified reviewVerified review - view originalExternal link

    I CAN RIDE AGAIN!!👍😃

    (0) (0)
  2. Verified reviewVerified review - view originalExternal link

    Great product.

    (0) (0)
  3. Verified reviewVerified review - view originalExternal link

    Product was easy to install and works as described. I have noticed less knee pain since I started using it!

    (0) (0)
  4. Verified reviewVerified review - view originalExternal link

    Ended up not needing this design. Process to replace it went excellent.

    (0) (0)
  5. Verified reviewVerified review - view originalExternal link

    (0) (0)
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FAQs

The current recommended weight limit for the Orthopedal Crank Arm Shortener is 250 pounds.

Yes, the OrthoPedal Crank Arm Shortener will fit most crank arms.  They come in wide and narrow versions depending on the width of the crank arm. The wide version will fit most modern aluminum crank arms. 

  • The standard version fits crank arms with a width of 5/8″ to 1 1/8″
  • The wide version fits crank arms with a width of 1 1/8″ to 1 3/4″