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13 January 2016 - 11:20pm
 
 

Trigger-shifters alternative for shifting with limited hand strength

 
An alternative to twist shifters for riders with limited hand-strength

Twist (grip) shifters are an inexpensive and reliable technology common on recumbent trikes. They have two main drawbacks:

  1. They are ergonomically mal-positioned for most vertical handlebar situations as they are intended to be gripped with the thumb and fore-finger, but, instead, are positioned at the heel of the hand.
  2. The twisting action to shift gears can affect the steering.

Due to the first drawback, people with limited hand-strength can have difficulty operating grip-shifts mounted in a vertical position.

We have been experimenting with alternatives to conventional grip-shifts on recumbent trikes and have mounted trigger / paddle shifters in several different positions with the intent of serving the needs of people with macro-movements, but limited hand-strength. Causes of limited hand-strength include stroke and other forms of full or partial paralysis, neurological conditions, and age.

The shifters shown worked well for some clients and potential clients with low hand-strength. The position seemed to be the best of all the positions we tried when used with macro push movements.

It would be relatively easy to re-arrange them to work in pull-only situations.

These shifters are quite reliable and almost as inexpensive as grip-shifters so the investment cost of this conversion is low.

People with stroke, Parkinsons, Ataxia, ALS, MS, and cerebral palsy could have improved shifting by using these shifters as shown.

 

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Information

[Updated 6/21/20] Beginning Wednesday, 24 June 2020, after three months of suspension of normal business hours, we will resume regular business hours. Customers will be restricted to enforce strict social distancing and priority will be given to honor appointments.

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