The M4X is the ultimate dual slalom/4X/short travel dirt jump bike, with trail bike capabilities.

The M4X rails berms and flows through corners – that’s a given and proven by Bernard Kerr’s King of Crankworx crown and Emilie Siegenthaler’s dual slalom prowess. What is truly surprising, is that the same characteristics that make it confidence inspiring in the air and on every landing also make it an incredibly fun trail bike. It’s exhilarating to shred a technical trail on an M4X with its razor sharp, accurate handling and heroic “flickability”. As our pro riders have said, “You can see a corner approaching, enter, and suddenly you’ve exited at double the speed.”

Rear Travel

Rear Travel

Wheel Size

Wheel Size



Geometry & Sizing

We strive to build the best-performing cycling products in the world.

Geometry image

Engineer's Corner

Get everything you need to know about the bikename.

DW-link® suspension design with position-sensitive anti-squat, tuned for instant acceleration and superior control while railing corners and boosting jump faces

Adaptive Logic RP23 Kashima shock with custom M4X slalom/dirt jump Boost valve and compression tuning

142mm rear spacing with 12mm through axle and 160mm post mount dropouts for maximum frame stiffness

Additional cable routing for dropper seat posts

ISCG 05 mounts

1.5” tapered head tube

Small Parts Schematic Save tech spec
Suspension Setup Guide Save tech spec
Sag Indicator Installation Save tech spec
Product Presentation Save tech spec
Pivot Owner's Manual Save tech spec

To ensure the best sizing, we recommend that you visit your local Pivot dealer to get a professional fit and refer to our geometry chart to check your measurements. However, we can provide a rough guideline: 

Small: 4'10" – 5’9”

Large: 5'9" – 6’4”

The M4X uses a threaded 73mm shell that is compatible with just about every possible MTB crank in the market.

Variables in frame size, discrepancies in scale calibrations, and method of weighing (with or without pedals and such) all lead to inaccurate comparisons, so we choose not to publish our bike weights. Pivot bicycles are among the lightest available, but the weight is only one of many factors that make a great bicycle. Other aspects such as frame stiffness, strength, durability, and ride quality are just as important as weight to our engineers when designing our Hollow Core Carbon and aluminum frames. Instead of comparing grams online, we suggest you visit your local Pivot dealer and see our attention to detail, smart, high value spec, and class leading features. Bring a scale if you’d like, but take just one demo ride and you’ll feel why Pivot Cycles are the most well-rounded, highest performing bicycles on the market and in many cases, yes, it’s the lightest as well.

The M4X uses the 142mm X 12mm hub/wheel spacing. Our custom 12mm DT Swiss axle is included with the frame. The axle is based off of Shimano’s 12mm through axle specifications for length and thread pitch so if you were ever to lose your axle, a Shimano or Shimano compatible axle will work properly as well.

Pivot uses a 1.5 thread pitch on the rear thru axle.


34.9mm or 35mm (as some manufacturers call it)

Yes. Any dropper post with external routing will work on this frame.

No. The frame is not designed to accommodate a front derailleur and does not have cable stops.

Yes. The frame is equipped with ISCG-05 tabs, so most chain-guides that are made for ISCG-05 tabs should work.

Zero stack (ZS) 44mm top and ZS 56mm bottom, or a Chris King Inset 2

We use the Maxxis Ardent Race 2.2 in our complete bike builds. However, the M4X is designed to easily accept most 2.3 tires in the market. For instance, a Maxxis High-Roller II 2.3 fits with plenty of clearance. For 2.35 tires in the market, many will fit, but rim width and tire manufacture sizing call outs and tire inconsistency can result in huge difference among both tire brands and individual tires. For anything beyond a 2.3, we suggest you check the fit with your chosen rim and tire combination to make sure it has proper clearance before riding.


No brake adapter is needed for a 160mm rotor. If you want to run a 180mm, you would need a 160mm direct mount/post-to-post adapter.

Eye-to-eye: 6.5"

Stroke: 1.5"

We recommend a 100-120mm travel fork on the M4X although the frame uses the same tube set as the Firebird and can handle forks up to 150mm.

The M4X shock uses M8 through bolt hardware on both the front and rear. Shock spacer dimensions are 22mm wide front and 36mm wide rear. The frame is designed around a standard size air can volume and we typically medium valving on the compression side (depending on rider weight) and light rebound damping.

You cannot run a coil-over on your M4X! The Mach M4X was designed to work with the progressiveness of an air spring. A coil-over shock (even one with separate bottoming control) does not offer the progressive spring curve that the M4X requires. Running a coil-over shock on the M4X will result in hard bottoming and damage to the frame.

A detailed PDF of the torque specs can be found under the "Tech Specs" tab.