MACH 4 SL (2026)

Answer

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:

X-Small: 4’10” – 5’4” | 147cm - 162cm
Small: 5'4" – 5’9” | 163cm - 175cm
Medium: 5'8" – 5’11” | 172cm - 180cm
Large: 5'10" – 6’2” | 178cm - 188cm
X-Large: 6’1” - 6’7” | 185cm -200cm

Be sure to consult our dropper post fit guide when making your selection.

We make it easy to get the best ride out of your Pivot bike with a simple sag indicator already installed on the shock. Watch how we set up suspension with Pivot’s Pro Garage Videos.

For more information on how to set up your Mach 4 SL’s suspension, check out the suspension setup calculator and guide found in Tech Specs.

The Mach 4 SL uses the Boost 148mm x 12mm hub/wheel spacing.

The Mach 4 SL is compatible with 29” wheels only.

The Mach 4 SL fits 29” tires up to 2.40” wide trail XC tires on 28/30mm wide rims. On narrow rims, 2.35” is usually the widest that you would want to go.

Yes, the Mach 4 SL was designed to clear a large water bottle on top of the down tube in all sizes – even the extra small! Medium through XL can fit 2 medium sized bottles in the front triangle, one on the down tube and one on the bottom of the top tube.

The Mach 4 SL uses an integrated IS52/52 headset.
This larger headtube allows you the option of internal routing through the headset with a compatible headset designed for internal routing.

The Mach 4 SL frame uses a 31.6mm seatpost.

The Mach 4 SL frame uses a 36.4mm or 36.5mm (as some manufacturers call it) seatpost clamp.

XS - 260mm
S - 300mm
M - 325mm
L - 365mm
XL - 410mm

*Please check seat post measurements carefully before installing the post. And refer to our dropper fit guide.

The Mach 4 SL is designed for an internal routing dropper post, so any internally routed dropper post or wireless 31.6mm dropper post is compatible.

The flip chip on the Mach 4 SL adjusts the amount of rear wheel travel. In the + it will have 120mm of rear wheel travel. In the – position the bike will have reduced rear wheel travel to 110mm.

The flip chip on the Mach 4 SL has two positions. The +/- etched on the link indicates the position of the upper shock bolt in the link. To change the travel, loosen the upper shock bolt until you can remove the filp chip on the non-drive side. Pull out on the bolt and drive side flip chip until it can be removed from the link. Rotate both chips 180 degrees, position the shock and reinsert the chips into the link. Torque the shock bolt to 13Nm.

A step-by-step guide can be found in tech specs.

The Tool Shed is Pivot’s internal storage and cable management system. This feature allows you to store all your ride essentials safely and cleanly inside the frame. Custom made storage bags are included with each frame. The tool shed also includes internal cable guides to keep your routing clean and quiet, even on the roughest surfaces. Check out the Toolshed and its features in the Pivot’s Pro Garage Video https://www.pivotcycles.com/en/pivot-cycles-tech-video-hub/

The Mach 4 SL will accept all cranks designed for the Boost system and compatible with a press fit 92mm bottom bracket. Boost system means that the rear hub spacing is 148mm. The Mach 4 SL can accommodate cranks with a 52mm or 55mm chainline, as long as they are compatible with the drivetrain you are using.

The maximum size chainring that will clear on the Mach 4 SL is a 36-tooth.

Yes, the frame has two tabs for a 1x chainguide without a bash guard.

SRAM AXS Transmission has a unique installation process that you must follow to set up this drivetrain on your Shuttle LT properly. The compete installation instructions can be found at https://www.sram.com/en/service/browse-by-product

The setup information for the Mach 4 SL in all sizes is: Setup Key- B | Setup Cog- 7 (21t)

Chainring Size / Chain Length
30t / 114 links
32t / 116 links
34t / 116 links
36t / 118 links

Refer to SRAM’s chain length calculator for the proper setup information and chain sizing https://axs.sram.com/guides/chain/calculator

he Mach 4 SL frame weights start at under 2500 grams (5.5lbs) with a Fox Float shock. Our complete builds can be under 11kg (24lbs). However, with creative parts selection bikes can be built lighter. With current world cup style racecourses and riding preferences, our builds are designed to handle the extreme end of technical XC riding. Pivot bicycles are among the lightest available, but 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 Mach 4 SL frame will clear either a 160mm or 180mm rotor with an adapter.

No brake adapter is needed for a 160mm rotor. However, if you prefer an 180mm rotor, you will need a 160mm to 180mm post mount adapter.

The Mach 4 SL was designed for either a 100mm or 120mm fork. The maximum travel length that can be used on the Mach 4 SL is 120mm travel.

44mm

The eye-to-eye is 190mm with a stroke of 45mm.

The Mach 4 SL shock uses M8 through-bolt hardware on both the top and bottom. Shock spacer dimensions are 30mm wide on both ends. The frame is designed around a standard sized air can volume. We typically run medium to firm valving (for XC racing) on the compression side (depending on rider weight) and light to medium rebound damping.

Larger volume spacers will resist bottoming, allow the bike to ride higher in the stroke and generally make the bike feel more “poppy.” If a rider is not getting full stroke or they feel that the bike is riding too high in its stroke, even with sag set properly, then they should go to a smaller volume spacer.

The Mach 4 SL Fox Float shock comes with a 0.5 cu in volume spacer installed. The max size that will work with this Float shock is 0.9cu in

P/N Description
233-00-538 Float 0.1cu in. Blue
233-00-624 Float 0.2cu in. Pink
233-00-533 Float 0.4cu in. Yellow
233-00-534 Float 0.6cu in. Orange
233-00-648 Float 0.8cu in. Purple

The Mach 4 SL SIDLuxe Flight Attendant shock comes with 0 tokens installed. The maximum token that can be installed is two.
P/N Description
11.4118.051.0008 SIDLuxe Bottomless Ring

The FOX 34 SL 120mm fork comes stock with 1 spacer and can handle a maximum of 5 spacers.

P/N Description
234-04-953 Float 34 10cc Green
The RockShox SID Ultimate Flight Attendant fork comes stock with 0 tokens and can handle a maximum of 3 spacers.
P/N Description
11.4018.032.000 RockShox Bottomless Token

The Flight Attendant shock and fork automatically adjust between three suspension modes. All AXS components are listening and learning from your riding to customize the system to you and how you ride. To learn more about the system and how it works visit the Rock Shox Flight Attendant page.

The Flight Attendant System on the Mach 4 SL is custom tuned for the kinematics of the Mach 4 SL. RockShox will have these specific parts available for aftermarket purchase in the future, but at this time the system is only available with a complete Mach 4 SL build.

Our Mach 4 SL flight attendant build includes all the AXS components to get the best performance and detailed data for Active Ride Dynamics. Begin by pairing all the AXS components. Then set sag as you
normally would. Lastly configure the AXS components.

The Mach 4 SL uses the Universal Derailleur Hanger (UDH) for drivetrains that require a hanger. SRAM Transmission mounts directly to the frame in place of the hanger. This derailleur hanger is compatible with all derailleurs on the market that require a derailleur hanger. We spec this hanger because it has some clever derailleur saving features and is more likely to be found at any shop and is also available in our webstore

The Mach 4 SL uses an axle for a 148mm rear spacing designed for the Universal Derailleur Hanger (UDH) standard. The rear axle supplied with the frame is a Pivot specific design using a 12mm X 1.0mm thread pitch. SRAM also makes compatible 148mm UDH axles. Pivot 148mm UDH compatible axles can be found in our webstore.

These can be found in the Small Parts Schematic