The Mirage crank shortener makes a bicycle’s cranks 2.5 or 5 cm shorter. It helps when a child gets a bike to grow into, when leg lengths differ, or when you need a smaller pedalling circle, for example during knee rehabilitation.

The shortener fits over the crank and is tightened with a stainless steel bolt, then locked in place with grub screws so it doesn’t move on the crank. The pedal screws into one of two holes, depending on how much shorter you want the crank. If the pedal thread is longer than the shortener is thick, fit the supplied washers.

It fits pedals with a 9/16" thread (most standard pedals) and crank arms 26 to 38 mm wide.

In the box:

• 2× aluminium shortener (left and right thread)
• 2× stainless steel bolt (left and right)
• 4× washer
• grub screws in 7, 11 and 13 mm lengths (4 of each)