Cassette Adapter 28-40

Excellent cassette adapter for Shimano and Sram users who require that one more extra sprocket on steep climbs. Very simple to install, it fits behind 11-34/36 cassettes, displacing last cluster and one smaller sprocket. It saves on average 50g from your original cassette!

This cassette adapter consists of 28-32-36-40T (154g) sprockets. It replaces your original cluster 28-32-36T (186g). It adds one bigger cog at the end, but still reduce weight and increase stiffness. You must also take off one more sprocket either 11 or 17T which decreases weight further.

Main advantages of using 4-cog cluster over single 40T cog are three-fold: Greater stiffness as a cluster, alloy freehub safety (15mm vs 4mm base) and huge weight reduction. After-market single 40T cog adds on average 50g to the original cassette, where absoluteBlack cluster takes off 52g. That is 100g difference!

Please note: rider+bike weight limit is 90kg (200lbs). This product is not suitable for shifting under huge loads as it may lead to deformation of teeth. Also, because it is CNC part it may not shift sometimes as crisp as original stamped cassette. Cnc'ed cassettes will always have a bit lower shifting performance than heavy steel, stamped cassettes.

Temporarily Out of stock.

original XT 11-36T	11	13	15	17	19	21	24	28	32	36		338g
XT 11-36 + absoluteblack_cluster		13	15	17	19	21	24	28	32	36	40	297g
XT 11-36 + absoluteblack_cluster	11	13	15		19	21	24	28	32	36	40	286g
XT 11-36 + 40T Oneup/Wolftooth cog	11	13	15		19	21	24	28	32	36	40	387g
original XT 11-34T	11	13	15	17	19	21	23	26	30	34		316g
XT 11-34 + absoluteblack_cluster		13	15	17	19	21	23	28	32	36	40	292g
XT 11-34 + absoluteblack_cluster	11	13	15		19	21	23	28	32	36	40	281g
XT 11-36 + "General Lee" adapter	11	13	15	17	19	21	24	28		33	40	297g
original Sram PG 1050	11	13	15	17	19	22	25	28	32	36		362g
Sram PG1050 +absoluteblack cluster	11	13	15		19	22	25	28	32	36	40	317g

For running a 1X system, please use 17px cage rear derailleur. When in use with 2x10, most recommended is long cage .

Size (Mass +/-1g):	154g
Color	BLACK !
Compatibility	SLX * (CS-HG81-10 11-36), SLX * (CS-HG81 11-34), XT (CS-M771-10 11-36), XT (CS-M771 11-34), Sram ** PG 1050 11-36 10 speed only.
Material	cnc machined 7075 Txxx Aluminum. Monoblock construction
Finish	type II anodizing
rear derailleur	must be used with 17px or long cage. 17px cage recommended.

Tooth Shape	Heavily optimized for Shimano compatibility
Lockring (optional)	Specially designed 41mm dia. To be used when removing 11T sprocket.

MSRP: £85 ......

Designed in UK. Manufactured in Poland (EU).

*SLX - this cassette only allows to take off 11T and use a special lockring to lock on 13T sprocket.

**Sram 1050 cassette only allows to take off 15T or 17T. You can't take off 11T as it will result with improper build.

There are two ways to fit cassette adapter to your drivetrain.

Before we start - Always use a new chain with a new cluster. This will increase longevity of drivetrain!

1. Remove the stock 17T sprocket with last cluster from your cassette, then put absoluteBlack cluster on the freehub and mount everything else back. (Sram PG 1050 users- you need to remove 2 spacers in total)

OR,

2. Remove 11T sprocket and last cluster. This option is a lot better in our opinion, but requires special lockring to hold 13T sprocket (lockring is available to purchase on site). Put few drops of 17px strength Loctite on lockring threads before tightening. This option is only for Shimano cassettes.

To finish the build off, please do 1-2 full turns(clockwise) of B-tension screw for proper adjustment. No longer bolts required.

If you don't know which option would suit you better, then just go for a ride and observe which of these two sprockets (11 & 17) you will miss less. Study shows, around 90% of mtb riders do not use 11T sprocket in terrain.

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