SRAM NX Eagle PG-1230 12 Speed Cassette

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Product Description

Ride anywhere with the wide-range PG-1230, 11 to 50-tooth Eagle™ cassette. The NX cassette gives riders every bit of the climbing range that the Eagle™ ecosystem affords with a simple upgrade to splined-drive body wheels. The PG-1230 is the only Eagle™ cassette designed to be durable enough to withstand the increased demands of E-MTB applications and a perfect solution to heavy-duty use and abuse.

Things To Remember:

  • Eagle™ technology provides an expanded, optimum, gear range making you fast on the flats, giving you control on the climbs and unleashing your speed on the descents.
  • Eagle™ is a complete drivetrain system that was developed to be an integrated high-performance ecosystem. The engineering and testing that went into the development provide for maximum performance, safety, and long-term durability to ensure a great consumer ride experience. We guarantee this performance when Eagle™ drivetrains are used as a complete ecosystem. For additional information, please contact your SRAM Sales Contact.
  • The PG-1230 is the only Eagle™ cassette that meets our durability requirements for E-MTB applications.

    Key Features:

  • Compatible with a splined driver body.
  • This PG-1230 cassette is an integral part of the SRAM Eagle™ drivetrain Ecosystem.
  • Wide 11-50t gear range—a perfect fit for any ride. Optimized gear steps across entire range.

    Speed (CS): 12s
    Gearing: 11-50t
    Cog finish (Cassette): Black
    Technology (Cassette): PG
    Cog sizes: 11-50t:11,13,15,17,19,22,25,28,32,36,42,50

  • Occasionally, without notice, manufacturers change product design and/or specifications.

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    Casettes Guide


    Cassette Guide

    A cassette is the cluster of gears that are attached to the rear hub of your bike. The derailleur shifts the chain up and down the cassette changing gears as you ride.

    There are many different sizes and types of cassette available. A cassette will wear over time and will need replacing. To easily find a replacement, the speed and number of teeth must be matched to your existing cassette to ensure compatibility with your shifter and derailleur.

    Cassette or Freewheel?

    The rear cluster of cogs is attached to the wheel in one of two different ways. To replace these cogs you will need to establish if you have a cassette or a freewheel.


    A freewheel is mainly used on older bikes from before the mid-'90s or on bikes that have 5, 6 or 7-speed cogs. A freewheel is a screw-on type, the ratchet freewheel mechanism is housed inside the cogs and is supplied as one complete unit. If your rear hub is designed for a screw-on freewheel then a cassette can not be fitted.

    Close-up of a freewheel


    A cassette will have more gears than a freewheel, housing 7, 8, 9, 10, 11, 12 or even 13 gears. A cassette does not include the ratchet mechanism that is found in a freewheel, instead, the ratchet mechanism is part of the rear hub. The part of the rear hub that houses the freewheel is known as the freehub. The cassette fits over the freehub, the most common way is that it slides onto a splined freehub and secures with a lockring.

    Close-up of a cassette & freehub

    What size?

    The size of the cassette is measured in teeth and the number of speeds. The teeth are the small spikes that stick out on each cog. The smaller the cog (and therefore the number of teeth) the harder the gear is to pedal, to be used when going fast. The larger the cog the easier the gear is to pedal, to be used when climbing a hill and going slow.

    When replacing your cassette it is best to count the number of teeth on the largest and smallest cogs, and match the replacement to these sizes and total speeds to ensure compatibility with your existing derailleur. Any particular rear derailleur will have a maximum capacity, so you cannot always add a larger cassette to get easier gearing without also changing the derailleur to suit the larger size.

    Mountain Bike Cassettes

    Mountain bike cassettes have seen a big change in the last few years. With the advent of 1x drivetrains that use a single cog on the chainset, cassettes have got much larger so the same gear range can be offered as was given by 2x drivetrains.

    10, 11 and now 12-speed cassettes are common on mountain bikes. To have the low gearing needed for the steep climbs and rough terrain found on MTB trails, most cassettes will use a 42 tooth or larger ring for 1st gear. Shimano's 12 speed and SRAM's Eagle cassettes use a massive 51 or 52 tooth 1st gear.

    Most 9, 10 and 11-speed cassettes still fit the tried and tested splined HG freehub design originally made by Shimano, though the newest 12-speed Shimano cassettes and SRAM cassettes that utilise a 10 tooth small cog use specialised freehub designs, namely Microspline for Shimano and XD for SRAM.

    Road Bike Cassettes

    Road bikes use smaller more compact cassettes than mountain bikes. The average speed of a road bike is much higher than a mountain bike, the vast majority of road bikes also use 2x drivetrains that give a good gear range so a small and light cassette can be used. By packing the gears in a smaller cluster there is less of a jump between each gear, meaning the ideal cadence can be kept as the gradient changes.

    The largest sprocket is much smaller than those on MTBs. For climbing and very hilly routes, a cassette with a 1st gear of 32 teeth can be used, but the most common size seen is a 25 tooth large cog, down to a 12 tooth small cog, known as a 12-25.

    Most modern road bikes will use 10 or 11-speed cassettes, though there is 12 speed offered by Campagnolo and SRAM on the most high-end groupsets.

    Removal and fitting

    Removal and fitting of a cassette is a relatively simple task that can be done at home, though there are special tools needed. There are also some differences between different brands of a cassette.

    Please see our How To Remove And Fit A Cassette guide with videos for more information.


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    Barclays Representative Example: If total purchase price is £1,399.00 and your selected term is 36 months 11.9% APR Representative, Annual Interest Rate 11.9% Fixed, you would pay £46.00 per month. Total amount payable will be £1655.83 with a cost of credit of £256.83. Finance is subject to application, financial circumstances and borrowing history. Performance Cycling Limited acts as a credit broker and not the lender, Barclays Partner Finance acts as the lender. Barclays Partner Finance is a trading name of Clydesdale Financial Services Limited, a member of the Barclays group. Clydesdale Financial Services Limited is authorised and regulated by the Financial Conduct Authority (Financial Services Register number: 311753). Registered in England. Registered No: 2901725. Registered Office: 1 Churchill Place, London E14 5HP.
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