HIGHPATH ENGINEERING

 

 

EGG

Crank Shorteners

mk.3

 

Price-list and order-form
Spare parts and repairs
Fitting instructions
Crank length

 

Pulse Crank Shorteners provide 3 or 4 new positions for your pedals and are designed to adapt adult cranks for shorter riders. Two versions are available:

Standard Crank Shorteners
Suitable for most able-bodied adults and children. Ideal for use by children on low-back tandems.
Have 3 pedal holes to shorten your cranks by 27, 50 or 70mm.
Effectively reduce standard 170mm cranks to 143mm, 120mm or 100mm  (in even 16% steps).
 
Long Crank Shorteners
For riders with serious mobility problems.
Have 4 pedal holes to shorten your cranks by 27, 50, 70 or 88mm.
Effectively reduce standard 170mm cranks to 143mm, 120mm, 100mm or 82mm.

(Click here for advice on choosing the length of your cranks.)

shortener   shortener


 

Pulse Crank Shorteners are machined from high grade aluminium alloy and are supplied with stainless fasteners. Unlike other designs, stainless bosses prevent damage to the original pedal threads in your cranks. They are supplied with a selection of fittings, allowing them to be fitted to most cycles:

  • Left cranks up to 41mm wide (*)
  • Right cranks up to 41mm wide (*), with removeable chainrings
  • Standard adult pedals which can be tightened with a spanner   (maximum thread length = 12mm)

      (*) please request 'fat cams' if your cranks are VERY narrow (less than 21mm)

 

The alternatives

Crank shortening : It may be possible to shorten your cranks permanently.
Swing Crank : Recommended if you have reduced bend in one of your knees (for example, following knee surgery).

 

Prices and how to order

Click here for other ways to order your Pulse Crank Shorteners.

 

MSF

August-November 2014

I'm attempting a 4000km solo cycle tour from Wales to the
Straits of Gibraltar to raise funds for 'Médecins Sans Frontières'.

MSF provides medical-aid in the World's many disaster zones.
It's a humanitarian charity for which I have the greatest respect.

You will be able to follow my weekly progress, donate money,
and read more about MSF by clicking here.
 

 

  Pulse Crank Shorteners GB
pounds
   
 
  Standard 3-hole Crank Shorteners (1 pair) £ 130.00
no order
 
  Standard 3-hole Crank Shorteners, polished (1 pair) £ 200.00
no order
 
        1 Standard 3-hole Crank Shortener £ 75.00
 left   right no order
 
        1 Standard 3-hole Crank Shortener, polished £ 110.00
 left   right no order
 
 
  Long 4-hole Crank Shorteners (1 pair) £ 170.00
no order
 
  Long 4-hole Crank Shorteners, polished (1 pair) £ 240.00
no order
 
        1 Long 4-hole Crank Shortener £ 95.00
 left   right no order
 
        1 Long 4-hole Crank Shortener, polished £ 130.00
 left   right no order
 
 
  Spare parts
 
  Click here to order spare parts for your Crank Shorteners
    including alternative fixings for very narrow and very thick cranks
 
  Post + packing:  £ 5.00 to any part of the World.  Free on orders over £150.00  
 

plastic cards

 

no checkout

 

Delivery

I aim to despatch these items within 7 days, but there may be delays at certain times of the year (eg. busy periods and holidays) - please contact Chris if you need to be certain. Click here for full delivery information.

7 day trial period

If you are unsure whether Crank Shorteners will suit you or not, please order them anyway and try them out on your own bike. If they turn out to be unsuitable, just return them within 7 days, at your expense, for either an exchange or a refund.

Free fitting
pdf Printed instructions are enclosed with every Crank Shortener, or you can download a copy here.
 
Important : Your safety depends on the correct fitting of these items. SEEK PROFESSIONAL HELP IF NECESSARY,
or send your crank(s) to me if you'd like me to fit your Crank Shortener(s) for you.

 

 

Crank length
3 cranks

It is important to use the correct length of crank to ensure that your legs can work efficiently. You risk damaging your knees if you habitually use cranks which are too long, especially as you get older. 170mm cranks, which most cycle manufacturers fit as standard to most bicycles, are unsuitable for anyone shorter than the average European adult male and are therefore too long for most people in the World!

Normally fit adult riders should use cranks which measure about 20% of their effective leg length, rounded to the nearest 5mm, whereas growing children can safely increase this figure to 22%. This length goes all the way to your hip joint and cannot be measured directly. Ask a friend to measure your height twice - first when you are standing upright against a wall, without shoes on, and second when you are sitting squarely against it. Then subtract one measurement from the other one, as shown below.

measuring height

The following table shows recommended crank lengths for normally fit riders on upright bicycles, based on the 20% to 22% range. Even shorter cranks may be required by disabled riders with restricted knee movement and by users of faired racing recumbents (due to space restrictions). Additionally, riders with very long legs may need shorter cranks on standard upright bicycles, to prevent their toes hitting the front wheel or their pedals hitting the ground when cornering.

leg leg :  50 52.5 55 57.5 60 62.5 65 67.5 70 72.5 75 77.5 80 82.5 85 87.5 90 92.5  
crank child : 
  adult : 
110
100
115
105
120
110
125
115
130
120
140
125
145
130
150
135
155
140
160
145
160
150
165
155
170
160
175
165
175
170
180
175
180
180
185
185

Note that, not only do riders with shorter legs need shorter cranks, they also need smaller chainrings and will probably ride slower than riders with long legs and long cranks (rear cranks on tandems are an exception to this). Never try to achieve a higher gear ratio by using longer cranks.
 

 

 

 

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Chris Bell
HIGHPATH ENGINEERING
Cornant, Cribyn, Lampeter, Ceredigion, SA48 7QW, Wales, UK
Wales
©  Chris Bell