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:
Small: 5'-5" – 5’9”
Medium: 5'9" – just under 6’
Large: 5'11" – 6’3”
What bottom bracket is used on the Firebird 27.5 and which cranks are compatible?
The Firebird 27.5 uses a threaded 73mm shell that is compatible with just about every possible MTB crank in the market.
What hub/wheel spacing does the Firebird 27.5 use?
The Firebird 27.5 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 Firebird Alloy 27.5 use?
The Firebird frame uses a 30.9mm seatpost.
What size seat clamp does the Firebird Alloy 27.5 use?
The Firebird Alloy 27.5 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 is the Floating Front Derailleur System (FFD)
The Firebird features our patented variable position floating front derailleur mount. Big travel is the enemy of front shifting. However, our floating design maintains the correct relationship with the chain for better shifting and chain retention at every point in the travel. The Pivot FFD keeps the chain in the sweet spot of the derailleur for better chain retention. In addition, the floating mount is fully removable so that a single chainring chain guide can be easily installed to the Firebird’s integrated ISCG05 mounts. No muss, no fuss, and a better ride for you!”
What front derailleur does the Firebird Alloy 27.5 use?
The Firebird Alloy 27.5 uses a Shimano E-type style, front derailleur mounted to our patented variable position floating front derailleur mount. If you are running a 2X or 3X Shimano systems with 10 speed rear cassette then use a Shimano direct mount FD. You will need to look at Shimano’s technical specifications in order to source the correct Shimano E-type front derailleur for the front chainring combination you are using. If you are using a 22-36 double chainring setup on your Firebird, Shimano makes a SLX derailleur specifically for 2 ring set ups which is designed for a maximum 36 large ring. However, even a standard 3 ring E-type front derailleur will work fine with a 2-ring set up and a bash-ring.
Can I run a chain guide on the Firebird?
The Firebird uses a standard thread in BB so that we can accommodate ISCG05 (international standard chain guide system 05 version). We offer a custom MRP LRP 2 ring shift guide that works in conjunction with the Pivot floating front derailleur for perfect shifting performance and worry free chain retention in even the roughest conditions.
What headset do I need?
The Firebird features a 1.5" head tube (49.6mm ID) with a custom Pivot angled headset design.
The custom Pivot angled headset is included with all Firebird complete bike models.
What travel fork can I use on my Firebird?
The Firebird was designed a 160mm fork. The maximum travel length that can be used on the Firebird is 170mm travel.
What is the fork offset on the Firebird 27.5?
The fork offset on the Firebird 27.5 is 44mm.
How wide of a tire can I run on the Firebird?
The Firebird was designed to fit many 2.35 tires on a rim with a 23mm or greater inner width. We use the Maxxis High-Roller II 2.3 in our complete bike builds. For other tires in the market, most 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 tire brands other then Maxxis, we suggest you check the fit with your chosen rim and tire combination to make sure it has proper clearance before riding.
How large of a rotor will fit on the Firebird?
The Firebird was designed for either a 160mm or 180mm rotor. However, a 203mm rotor will clear as well.
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 is the eye-to-eye shock length and stroke length on the Firebird?
The eye-to-eye shock length is 8.5 inches and the stroke length is 2.5 inches.
If I want to run a different brand of shock on my Firebird, what else do I need to know?
The Firebird shock uses M8 through bolt hardware on both the front and rear. Shock spacer dimensions are 22mm wide top and bottom. The frame is designed around a large volume air can. With the Fox shock, we run a +.4 or +.6 cubic inch volume spacer in the can to reduce the volume back down. We run medium compression valving and medium rebound damping. Although the Float CTD Kashima is the stock shock on the Firebird, we offer the Float X as an excellent upgrade option as well.
Can I put a coil-over shock on my Firebird?
In General, you cannot run a coil-over on your Firebird! The Firebird 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 Firebird requires. Running a coil-over shock on the Firebird will result in hard bottoming and damage to the frame. The one exception is the Fox RC4. It is possible to run this shock with the bottom out control turned at least 75% in (for near maximum bottoming control). Use of any other coil-over on the Firebird will void the warranty.
What are the torque specs?
A detailed PDF of the torque specs can be found under the "Tech Specs" tab.