Discontinued Items Archive

Chainring BCD diagram

Bolt circle diameter or BCD is the imaginary circle that passes through the center of all the chainring mounting holes. Most e*thirteen chainrings, bashguards and cranks use the most common BCD for mountain bikes, 64/104. We also make guiderings specifically for 120BCD SRAM cranks. Since measuring the actual BCD can be tricky, use this chart's B dimension to measure two adjacent bolt holes.




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Can I install a Guidering M on a non-e*thirteen crankset?

We optimized the chainline of the Guidering M to work best on e*thirteen cranks, but the 104bcd version will fit any 104 bcd crankset without inner chainring tabs.

Quick Connect rings feature an e*thirteen specific spline and are only suitable for e*thirteen cranks.

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Guidering M wear recommendations

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Does the Guidering M work as well with 9/10 speed as it does with 11 speed?

Guidering M technology increases chain retention on 9, 10 and 11 speed systems. However, due to the larger gaps between the plates on 9 and 10 speed chains, the level of retention is reduced when compared with 11 speed chains.

Adding a clutch rear derailleur will provide the best chain retention without a chainguide.

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Should I use a specific type/brand of chain with my guidering M?

For 11sp XX1 or XO1 drivetrains we recommend Sram’s XX1 or XO1 chain. For 10sp drivetrains we recommend high quality Shimano chains such as XT or XTR.

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How do I know when my Guidering M is worn out?

Wear and tear on a Guidering M is highly dependent on riding conditions and bicycle maintenance. If you keep the ring and your chain clean, it should provide excellent life.

Replace your chain based on your chain manufacturers recommendations, as your guidering M will wear considerably faster when used with a worn chain.


Like any ring, if you start to see a loss in it’s chain retention properties it’s probably time for a new one.


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Can I use a Guidering M on my double or triple crankset?

Guiderings are designed to be run as a single front chainring, as a result they do not have shift features that will allow your chain to move from one ring to the other. While they will fit on most 104mm BCD cranks they are only intended for single front ring use.

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What size chainring bolts do I need for my 104bcd Guidering M

For 32 tooth rings and larger, you will need chainring bolts with a 5mm T nut.

28 and 30 tooth chainrings should be installed with chainring bolts at least 6mm long.

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Are your Guiderings 9/10/11 speed compatible?

Yes, all of our cranks and chainrings are 9, 10 and 11 speed compatible.

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