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Price-list and order-form
Fitting instructions
Crank length
Pulse Crank Shorteners provide three or four new positions for your pedals. They are designed to adapt adult cranks for shorter riders and they are ideal for use by children on low-back tandems.
Two versions are available:
- Standard Crank Shorteners have 3 pedal holes and will shorten your cranks by 27, 50 or 70mm, effectively reducing standard 170mm cranks to 143mm, 120mm or 100mm. These are suitable for most able-bodied adults and children, and are ideal for use by children on low-back tandems.
- Long Crank Shorteners have 4 pedal holes and will shorten your cranks by 27, 50, 70 or 88mm, effectively reducing standard 170mm cranks to 143mm, 120mm, 100mm or 82mm. The extra position is for riders with serious mobility problems.
(Click here for advice on choosing the length of your cranks.)
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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)
The alternative: Crank shortening
It may also be possible to shorten your cranks permanently. Click here for details.
Prices and how to order
Click here for other ways to order your Pulse Crank Shorteners.
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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.
Fitting instructions
Important : Your safety depends on the correct fitting of this item. Seek professional help if necessary.
Printed instructions are enclosed with every Crank Shortener, or you can download a copy here.
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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. |
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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. |
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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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