Primo Sprocket Adaptor

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Primo Sprocket Adaptor

The Primo sprocket adaptor reduces a 24mm (23.8mm to be precise) sprocket hole down to fit on crank spindles with a 19mm diameter. This is made from steel and will push tightly into the sprocket with the larger flanged section protruding from the back of the sprocket. You may need tap this lightly with a hammer to make sure it's fully inserted into the sprocket and sitting flat.

 Almost all complete BMX bikes come with a 19mm diameter spindle as well as many after market cranks such as Profile Race cranks, Cult Crew cranks, Rant Bangin' cranks, Subrosa Rose cranks and Stranger Level to name a few.

Although this is branded as a Primo adaptor this will fit all different manufacturers of both sprockets and cranks.

Standard delivery service 1-2 days

Orders under £50 are £3.95

Orders over £50 are Free


  • We will do our best to ship all ‘in-stock’ orders that are placed before 2pm on the same day (excludes weekends).
  • Highlands, Islands and off-shore UK destinations should allow extra time because of their remote locations.
  • All orders placed during the weekend will be dispatched the following working day.



All UK orders are dispatched with Royal Mail or Fedex and can be fully tracked & traced online.


Please contact us within 2 days of delivery listing any missing or damaged items.

Before returning any items you must first contact us to obtain an RMA (Return Merchandise Authorisation). The RMA will help us to speed up the return process. 


Please contact us directly to find out the warranty policies for specific brands and products as these may vary from product to product. When contacting us regarding warranty issues please include pictures to assist the return procedure.

RETURN ADDRESS: Backyard Returns, c/o Seventies BMX Distribution, 51 Woodland Vale Road, Hastings, St Leonards-on-sea, TN37 6JJ

Email: info (at)

Phone: 01424 857239