Frequently Asked Questions
Which size bike should I purchase?
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:
XX-Small: 4'10" – 5”2”
X-Small: 5'2" – 5’5”
Small: 5'4.5” – 5’9"
Medium: 5'9” – 6’
Large: 5'11” – 6’2”
X-Large: 6’2” +
What bottom bracket is used on the Mach 4 Alloy and which cranks are compatible?
Pivot is the first frame manufacturer to feature the 92mm wide bottom bracket shell standard, originally developed in conjunction with Shimano XTR. With the press fit 92 system, there are no external washers or threads in the shell. The bearings are housed in light composite resin cups with a full sealed sleeve to keep out the elements. This design allows for easy crank installation, with no frame facing or special spacers required. Chain line is perfectly optimized and as an added advantage, the bearings are extremely easy to replace. Another bonus is that the XTR version includes a 3 year warranty from Shimano. The system works with Shimano, FSA and Race Face cranks (all compatible with the Shimano cup design) as well as the SRAM GXP system for which SRAM offers both standard and ceramic versions. In addition, Enduro and several other aftermarket companies offer both replacement bottom brackets and bearings to support every major crank brand.
Are there any other bottom brackets that will work with the Mach 4 Alloy? Can you upgrade to ceramic bearings?
We use a Press Fit 92 BB (sometimes called PF92 or BB92) design. Almost every crank and BB manufacturer offers a bottom bracket that is compatible with the Press Fit 92 system.
What is the narrowest Q factor crank that the Mach 4 Alloy will accept?
The Mach 4 Alloy will accept cranks with a Q factor measurement as low as 156mm (Such as the narrower option in the SRAM XX1 or the new XTR Race crank). Of course, anything greater than 156mm will work as well. Most standard MTB Q factor measurements are at 163mm.
What hub/wheel spacing does the 4 Alloy use?
The Mach 4 Alloy 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.
What size seatpost does the Mach 4 Alloy use?
The Mach 4 Alloy frame uses a 30.9mm seatpost.
What size seat clamp does the Mach 4 Alloy use?
The Mach 4 Alloy frame uses a 34.9mm or 35mm (as some manufacturers call it) seatpost clamp.
Can I use a dropper post with this frame?
Yes. Any dropper post with external routing will work on this frame.
What front derailleur does the Mach 4 Alloy use?
The Mach 4 Alloy uses a uses the e-type top pull Shimano front derailleur. We simply unbolt the derailleur from the plate and mount them directly to the precision machined tabs on our frame. This gives all Pivot frames the perfect derailleur height, angle, and location, and a super rigid mounting surface for the most precise and positive front shifting possible. You will need to look at Shimano’s technical specifications in order to source the correct Shimano top pull DM front derailleur for the front chainring combination you are using.
What headset do I need for the Mach 4 Alloy?
The Mach 4 Alloy uses a ZS (zero stack) 44mm top and (zero stack) 56mm bottom, or a Chris King Inset 2.
How wide of a tire can I run on the Mach 4 Alloy?
We use the Maxxis Ardent Race 2.2 in our complete bike builds. However, the Mach 4 Alloy is designed to accept many 2.35 tires in the market. For tires other then what’s specified in our complete bike models, we suggest you check the fit with your chosen rim and tire combination to make sure it has proper clearance. We have found that rim width, tire manufacture sizing call outs and/or tire size inconsistency can result in huge difference among both tire brands and individual tires.
How large of a rotor will fit on the Mach 4 Alloy?
The Mach 4 Alloy will clear either a 160mm or 180mm rotor.
What type of rear brake adapter do I need?
No brake adapter is needed for a 160mm rotor. However, many manufacturers make adapters for larger rotor sizes, in which case you would need a 160mm direct mount/ post to post adapter.
What travel fork can I use on my Mach 4 Alloy?
The Mach 4 was designed for either a 100mm or 120mm fork. We use a 120mm fork in all our complete bike builds. The maximum travel length that can be used on the Mach 4 is 120mm travel.
What is the eye-to-eye shock length and stroke length on the Mach 4?
On the Small frame size, the eye-to-eye shock length is 7.25 inches and the stroke length is 1.75 inches. On the Medium, Large, and XL frames sizes, the eye-to-eye shock length is 7.5 inches and the stoke length is 2.0 inches. For the XXS and XS frame sizes, the eye-to-eye shock length is 6.5 inches and the stroke length is 1.5 inches.
If I want to run a different brand of shock on my Mach 4 Alloy, what else do I need to know?
The Mach 4 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 run light valving on the compression side (depending on rider weight) and light rebound damping.
What are the torque specs?
A detailed PDF of the torque specs can be found under the "Tech Specs" tab.