Features:

• Perfect for converting an existing Shimano XT or XTR 11-36T 10 speed cassette to a 1×10 setup.

• Includes 16T sprocket and anodized colour matched cassette lock-ring

• 7075-T6  ALLOY 
• 42T SPROCKET FOR 10 SPEED SHIMANO HUB
• ANODIZED RED

A2Z 42t Adaptor Cassete Sprocket RED (Create an 11-42t Cassette)

 The A2Z ratio expander allows you to upgrade your existing 11-36 10spd cassette to give an 11-42T range. This simply installs behind your existing cassette and replaces one of the smaller sprockets, usually 17T.

This comes with a replacement 16T sprocket for the middle of the casstte so you can remove the 17T and the 15T and put the 16T supplied in to give a smoother transition. 

Shimano Only 42T sprockets have been designed, this gives us the following benefits which wouldn’t be possible with a larger sprocket size or with a universal type design…
 

Precise matching of the tooth profiles and shifting points specific to each cassette
Perfect mating of supporting tabs reducing flex and aiding shift performance
 

Lower B-tension adjustment is needed when this is fitted

Also includes a Colour coded cassette lockring for extra colour detail.

Being a shop and with a workshop already fitting these if you have any queeries regarding the fitting of these just give us a shout, we probably know the answer to your question,  if we dont we will find out!!!

Compatible with the following 10 speed cassettes: