Calculated Racing comes straight out of the heartland of BMX, California, and they produce these cranks in-house at their Santa Cruz factory where they have tight control over both design and quality. These guys are a passionate team that love BMX racing and it shows in their products like these Calculated VSR M4 Mini Cranks.

CNC'd machined out of 7075 aluminium, these cranks are manufactured in all sizes from 100mm right through to 160mm in 5mm increments.

One thing to note here is that these cranks are sold without a spider so that you can have a choice of bolt pattern of either 104bcd (to fit 4 bolt chainrings) or 110bcd (to fit 5 bolt chainrings). PLUS, there's a choice of a Micro or a Mini version of each spider, so you can save even more weight should you choose. 

These lightweight crank arms allow you to really dial in the right sized cranks for your young rider. Utilising a square tapered bottom bracket design, you can bolt these straight up to your current race bike, though this company does recommend a 108mm wide bottom bracket spindle due to the design of the arm.

Specs:

• Recommended 108mm or wider bottom bracket
  
• Rider weight limit 43 kg (95 lbs)
  
• Compatible with Answer style square spiders and sprockets