Crankset FAQs



Crankset FAQs

What’s the difference between BB30 cranksets and MegaExo?
BB30 refers to the spindle diameter of the crankset. BB30 cranksets are 30mm in diameter whereas MegaExo cranksets use a 24mm spindle. Because of the spindle diameter difference, MegaExo and BB30 cranksets are not interchangeable.

In reference to Full Speed Ahead’s range of mountain bike cranks, what is 386 mean?
386 is short for 3 chainring bolts in an 86mm bcd. 386 is proprietary to Full Speed Ahead 2 speed mountain bike cranksets. Having an 86mm bcd allows us to have a smaller inside chainring (27 tooth instead of the traditional 29t on 104 bcd cranksets) for a gear range that is more suitable for all types of mountain bike riding.

Can I use a BB30 crankset in my standard frame (threaded bottom bracket shell)?
No, there isn’t a bottom bracket available to convert a standard threaded bottom bracket shell to fit with a BB30 crankset

Will an FSA crank work with my Campagnolo, SRAM, or Dura-Ace 9/10 speed?
Yes, FSA cranks are compatible with all of the above.

Can I use my MegaExo crankset in my frame that is made with a BB30 bottom bracket shell?
Yes. FSA makes the M3 bottom bracket kit to adapt MegaExo cranksets to BB30 frames. There are four types of M3 bottom brackets; 2 for road, and 2 for mountain. Make sure to look at the M3 bottom bracket specifications for proper compatibility with your crankset.

Will an FSA crank work with my Campagnolo, SRAM, or Dura-Ace 9/10 speed?
Yes, FSA Cranks are compatible with all of the above. For more specific information see FAQs on Shifting.

My bicycle is equipped with a Shimano 10 speed triple front derailleur and I want to upgrade to a Full Speed Ahead carbon fiber triple crankset. Do I need to do anything special?
It is important to understand that the Shimano 10 speed triple systems have specific requirements. The chain ring tooth counts should not be altered. To upgrade, an FSA triple crankset equipped with the same chainring configuration as your original S-10 setup. The only exception is a case where an S-10 crank is equipped with a 52-tooth chainring. FSA has performed extensive testing and concluded that a 53-tooth chainring works very well as an upgrade.

I want to service or replace my bottom bracket. Is there anything special I need to know before removing my Isis Drive or Octalink crank arms?
Yes. As it has to do with the removal of crank arms, poor mechanical technique and planning can lead to ruined crank arms. Make sure the Jis or ISIS or Octalink splines are greased prior to installation. Upon disassembly, make sure the crank arm removal tool is fully threaded into the crank arm. FSA does not recommend using self-extracting crank bolts for the removal of Jis/Isis Drive crank arms. If present, remove the self-extractors and use a proper crank arm removal tool.

I have play in my MegaExo crankset, it moves side to side similar to the handles in a foos ball table. What can I do?
The answer to this question depends on the model of crankset you have. But first check the instructions and make sure the small parts listed in the illustrations are assembled in the correct order on your bicycle. Replace any broken or worn o-rings, rubber washers, and bearing covers. Then make sure your crankbolt has been tightened with a calibrated torque wrench to the proper specification.  If there is still side-to-side play, this may indicate a frame incompatibility or much more serious issue and having the bike be inspected by a qualified bike mechanic is in order.

I have a K-force Light/ SL-K Light crankset on my bike, and the wave spring washer is not completely compressed. Is this correct?
Yes. The wave spring on Light series carbon cranks does not need to be completely flat in order to function correctly. What is most important is that the crankbolt is tightened to the proper torque specification (45-55Nm). If a torque wrench is not used to assemble the crank, there is a risk that the crankbolt may not be tightened correctly and the crank arm can come loose and fall off while riding the bicycle causing serious accident or injury. If the crankbolt is over-tightened, the wave spring washer can be damaged, the crankarm and bolt can be damaged, and the bottom bracket may not rotate smoothly. In short: Always use a calibrated torque wrench to install MegaExo cranksets.

Can I use pedal axle extenders on my carbon crankset?
No. FSA does not recommend the use of pedal extenders or pedals with extra long axles on carbon cranks.

Do I need to use the pedal washers with my FSA crank?
Pedal washers need to be used with carbon fiber cranks. Pedal washers are designed to protect the crank material from stress or abrasion created with the pedal interface.

The chainrings on my ISIS crank seem to move side-to-side when I turn the cranks?
Have your chainrings or crankset been impacted in an accident or otherwise damaged? If so, replacement may be the best course of action. Check to make sure that the crank arm is installed all the way to the stop collar on the spindle. To do this first inspect the inside of the right crank arm by the bottom bracket spindle. You should not be able to see any of the spline ridges on the spindle, or space between the stop collar and crank arm. If any of the spline ridges are visible, then the crank arm is not installed properly. The crank arm must be tightened all the way up against the spindle stop ring.

To install your Isis Drive crank arms correctly first read the detailed instructions as posted on this website or in the manual that should have come with your crankset. The shortened version of the installation instructions are as follows: 

First apply light coating of grease to the spindle where the crank arm will be installed. Tighten the crank arm onto the spindle using a chromoly crank arm bolt, and a long handle 8mm allen wrench. Tighten the crank arm all the way until it stops against the stop collar on the spindle. Once the crank arm is up against the stop collar, then the chromoly bolt can be removed, and an alloy one put in place and tightened with a torque wrench, or the chromoly bolt retightened with a torque wrench. In most cases, when the crank arm is installed against the stopper any side to side chainring movement will be removed. Because of manufacturing tolerances in both the crank and the bottom bracket, in some cases, re-clocking the crank 1/4 turn on the splines will better align the chain rings.

If there is still side-to-side chainring movement, then FSA should inspect your crankset for warranty.
For a warranty claim, please contact Full Speed Ahead for a return authorization claim number.

Where can I find more information about Patterson Crankset?
Please visit the Metropolis website here.

Which is the official website of Patterson Crankset?
You can visit the official Patterson Crankset website for more information here.