Brakes & Gears Etc

New Sram GX DH transmission

Great value gravity focussed seven speed transmission

Incorporating the same Championship-winning SRAM 1x™ tech as the German-engineered, innovative X01 DH drivetrain, GX DH delivers dedicated, gravity focused 1×7 performance that doesn’t break the bank.

SRAM have been innovating at a real pace in the last twelve months, with new transmissions at all price points, along with developments in bars, stems and seatposts. We’ve seen the launch of the SRAM Eagle 1×12 trail transmission, the entry-level 1×11 NX, a revamped and longer stroke Reverb as well as a complete makeover of the Truvativ Descendant hardware. They’re on it, no question and are covering not only trail through to DH but all price points too. Real ‘trickle down’ technology that’s both proven as well as innovative and is now reaching a wider audience. A good move from from SRAM and one we very much approve of.

This new, lower priced yet dedicated DH transmission opens up more options when it comes to deciding how and where to spend your money when it comes to equipping your bike or custom build. The new GX DH kit is not only cheaper than XO DH (by a fair chunk…) but it is compatible with it too. Throw this in with the GX DH seven speed cassette fitting a standard splined freehub body and you can keep your tried and tested wheelset rolling, and check the price of this sprocket cluster too…£26!

If you’re charging hard (and hitting the ground hard too?) then kit that is affordable to replace, without any headaches is an added bonus. On a dedicated DH bike you’ll not be wearing the transmission out through high mileage but more than likely damaging it through knocks from the trail or the uplift van. Throw in a day on the hill in filthy weather and the water and grit grinding paste will have you heading for the workshop too. Cheap to replace is good news all round.

When building a custom DH bike there are undoubtably areas that will need a good dose of your budget spending on them, you know, the areas that will make a real difference to how your bike performs. Suspension (the forks, the rear shock and custom tuning), wheels, quality tyres and the correct cockpit set-up all can eat your money and rightly so, these components make sense. With an affordable yet dedicated transmission that functions well, you can spend your money wisely.

GX DH is a no-brainer for any rider dedicated to gravity riding but with an eye on price. With its main objectives being durability and dependability, GX DH makes heck of a lot of sense.

Match this GX DH gearing up with the Truvativ Descendant crankset and you have a winning combination.

SRAM PG-720 Cassette

The GX DH downhill-optimized 7-speed cassette provides gear steps that give each shift more purpose with its compact design allowing more spoke clearance too. It’s a full-on, dedicated SRAM 1x™ cassette for gravity use at an amazing price. Match this to the dedicated SRAM PC-1130 chain and you have no reason to ignore transmission maintenance.

The PG-720 cassette is an integral part of the SRAM 1x™ DH drivetrain system and is the most affordable full-featured, dedicated 1x DH cassette in the industry.



Fewer cogs allow for a faster transition from starting cog to highest cog.

More rear wheel clearance around spokes.

Fully compatible with the SRAM X01 DH drivetrain.

Splined driver body compatible.


Cog Finish – Black
Cog Sizes – 11-25t: 11,13,15,17,19,22,25

PRICE: £26

GX DH Rear Derailleur

The GX DH 1x X-HORIZON™ rear derailleur keeps the World Championship-winning features of the XO DH but has a price tag that will appeal to privateer racers and those dipping their toes in the water of gravity riding. This is a DH derailleur that is easier to shift, is incredibly precise and keeps the unwanted noise of chain slap to a minimum, so you can concentrate on your riding without the distractions of compromised gearing. The GX 1x X-HORIZON™ rear derailleur is an integral part of the SRAM 1x™ DH drivetrain system.

This is the most affordable, dedicated 1x DH rear derailleur available.


X-ACTUATION™ for precise and dependable 7-speed performance.

Fully compatible with the SRAM X01 DH drivetrain.

X-HORIZON™ design that reduces shift force, ghost shifting and cage slap.

12-tooth X-SYNC™ pulley wheels.


Cable Pull Ratio-X-Actuation
Cage- Medium
Cage Material-Aluminum
Max Tooth-28
Pulley Bearings-Steel
Speed- 7

PRICE: £88

GX DH Trigger Shifter

The authentic and reassuring click of the GX DH trigger shifter means both an accurate gear shift and utter dependability regardless of the weather or track conditions. A critical component in the lineup, the GX DH shifter is engineered in Germany to deliver great shifting when you want it. The Ergonomics and shifter feel are up to SRAM’s usual standards.

The GX 1x X-ACTUATION™ DH shifter is an integral part of the SRAM 1x™ DH drivetrain system

A dedicated 1×7 shifter that completes this great value DH transmission.


X-ACTUATION™ for precise and dependable 7-speed performance

Fully compatible with the SRAM X01 DH drivetrain


Cable Pull Ratio- X-Actuation
Clamp Included- No
Color- Black
Compatible Derailleurs- 7-speed
Matchmaker Compatible- Yes
Max Upshifts-5
Multi Position – Yes

PRICE: £35




The X-HORIZON rear derailleur’s ‘straight parallelogram’ design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.


SRAM X-SYNC 1x chain rings provide the highest level of performance and durability. The SRAM X-SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrain.


Developed specifically for SRAM 1x, X-ACTUATION keeps shifting sharp and consistent across the entire cassette.



This is designed to work well with the SRAM GX DH – See Dirt’s first look on the Descendent kit here.

Building a custom DH bike? Check out our downhill bike buyer’s guide HERE.

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