SRAM XX SL, XX and X0 Eagle Transmission (T-Type) Cranksets are available in different Q-Factors (168 mm and 174 mm). The chainrings that fit these cranks come in both 0 mm and 3 mm offsets in order to fit both Boost (52 mm chainline) and Wide (55 mm chainline) bikes. Therefore, you need to be sure you order the correct chainring offset based on your cranks’ Q-Factor as well as your chainline. So we put together the following information to make it as easy as possible!

## How to Determine Your Chainring Offset

For 168 mm Q-Factor cranks:

- If your bike has a 52 mm chainline, you need a 3 mm offset chainring
- If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

- If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version
- If your bike has a 55 mm chainline, you need a 3 mm offset chainring

## How to Determine Your Q-Factor

If you have the SRAM X0 Eagle Transmission Crankset or the SRAM XX Eagle Transmission Crankset (Non-SL Version), your Q-Factor is 174 mm.

If you have the SRAM XX Eagle SL Transmission Crankset, your Q-Factor could either be 168 mm or 174 mm. If you are not sure what it is, we suggest sending us your SRAM part number (serial number) and we would be happy to let you know what your Q-Factor is. You can find the part number on the inside of the drive side crank arm.

If I have an XX SL crankset with a regular dub spindle, can I purchase a wide dub XX power meter spindle and combine them? In other words, are the actual cranks different or is it just the spindle (with regard to q factor)? I have an Epic 8 and specialized says I can use either a 52 or 55 chainline. thanks, Eric

Hi and thanks for the question,

The crankarms are exactly the same. The difference in length is only in the axle itself. SRAM does not considering using the XX spindle meter paired with the XX SL driveside as compatible even though the mounting points are identical. Besides the weight (XX is foam core, XX SL is hollow) and aesthetic difference, you may run into Warranty issues down the road if ever needed.

Thanks,

Hi guys I have a xxsl group to install. My question is around the dub wide bottom bracket. What spacers would I require? My xxsl power crank is Q-174 3cm offset 55 cl. Thanks

Hi and thanks for your question.

Spacer combinations will all revolve around your frameset’s bottom bracket configuration. Please see the pdf below with the SRAM Dub Spacer Chart:

https://www.sram.com/globalassets/document-hierarchy/compatibility-map/mtb/dub-mtb-bottom-bracket-compatibility-chart.pdf

Thanks,

I have the xxsl eagle crank arms 10T46522888. Going to use these with a sram xxl transmission chainring.

What is the Q-factor?

I have an new Epic 8, that has spacers on both sides. Came with an Eagle GX crankset. Do I need to keep these spacers?

Hi and thanks for the great questions,

The Q Factor of your crankset is the narrow 168 mm Q. Your Epic has a 73 mm BSA bottom bracket so adding the 168 XX SL crankset will require no spacers on the non-drive and one 4.5 mm spacer on the driveside. Please check the current spacers on the crank for dimensions.

Thanks,

Hi. I have the FC-XX-SL-D1 crankset with serial number 03T46026936. Can you please let me know the Q Factor? Thanks!

Hi Will and thanks for the question.

Your crankset is a 174 Q Factor. If running this on a 55 mm chainline frameset, you will need the 3 mm offset chainring.

Thanks,

Hi, I have an SRAM XX SL Eagle Transmission Groupset with crankset Serial number 06T46348941 (model number FC-XX-SLP-D1), cranks are 175mm. Could you please let me know what is the Q factor? Thank you so much, Lenka

Hi and thanks for the question,

Your XX SL Crankset has the 174 Q Factor. If using a 55 mm chainline frameset, please mate a 3 mm offset chainring to achieve this chainline.

Thanks,

Hello,

I have a Specialized Epic 8 expert and just bought XX SL Crankset serial #24T33685291 FC-XX-SL-D1. Could you tell me what offset chainring I need? If I’m right it looks like mine is the 55mm version crankset and I believe my chainline is 55mm with the factory GX Transmission? Just want to confirm before ordering.

Thanks,

Scott

Hi Scott,

You’re crankset is the 174 Q Factor version of the XX SL. To run this on a 55 mm chainline frameset, please use a 3 mm offset chainring.

Thanks,

I just bought SRAM XX SL cranks for Pivot frame with a 52mm chainline. I didnâ€™t know they came in 174mm Qfactor also. Not sure if mine are 168 or 174.

24T33610498

FC-XX-SL-D1

Thanks!

Hi and thanks for the question.

Your XX SL crankset has the 174 Q Factor. Using a 3 mm offset ring will yield a 55 mm chainline with these. The 168 Q Factor version with 3 mm offset ring will be applicable for a 52 mm chainline.

Thanks,

So I donâ€™t have my bike yet- Iâ€™ve ordered it and just ordered a XO power meter from you- thanks! Howeverâ€¦.. Iâ€™d like to go from a 34t to 36t. Seems like my only option is to go with an XX SL. My chain line is 55- do I order the 0 or 3mm offset?

Hi and congrats on the new bike!

Great question. The XO crankset only comes in a 174 Q Factor so this crankset uses a 3 mm offset chainring to attain the needed 55 mm chainline.

Thanks,

Hi, would you be able to assist with what power meter crank would work with my current set up.

series number:

230110

FC-XO-D1

i believe its a 55mm chain line.

Hi and thanks for the question,

If looking for a great single-sided power meter, the https://powermetercity.com/product/sram-x0-eagle-axs-transmission-left-arm-spindle-power-meter/ is a choice designed exactly for this crankset.

Thanks,

i have a sram XXL crankset with a power meter, the serial number is 07T04630128, what chain ring would I need to 0 or 33m offset, thank you

Hi,

This serial number corresponds to the XX1 Eagle crankset in a 168 Q Factor. Please see the below chart for your frameset’s application:

For 168 mm Q-Factor cranks:

If your bike has a 52 mm chainline, you need a 3 mm offset chainring

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,

My SRAM XXSL Transmission crankset serial #23T33398833 FC-XX-SLP-D1 and the Allied BC40 has a 52mm chainline. Will this work? Thanks for the info. Good stuff!

Hi and thanks for the question.

Your crankset is the 174 Q Factor version. According to SRAM, even with the 3 mm thread-on chainring, this will only be compatible with a 55 mm chainline frameset.

Please see below:

For 168 mm Q-Factor cranks:

If your bike has a 52 mm chainline, you need a 3 mm offset chainring

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,

If the bike frame is spec’d w SRAM Eagle Transmission then doesn’t that mean it has to have a 55mm chainline?

Hi,

Yes. Very likely 55 mm frameset if coming stock with Transmission. You will need to contact the frame manufacturer to find out their chainline specification for your particular bike.

Thanks,

My SRAM XX SL Transmission crankset serial# 23T33398833 and the frame that I ordered has a 52mm chainline. Will this work? Thanks for all the information on your website. Good stuff!

Hi. My xx-sl crank serial number is: 34T34539337

What is the q-factor and chainring offset I will need assuming a 55mm chainline?

Hi and thanks for the question.

Your XX SL crankset is the 168 Q Factor version. Using a 55mm offset frame, you will need the 0 degree offset chainring.

Thanks,

What is the Q factor on my xx sl crankset?

03T30583813

FC-XX-SLP- D1

Hi,

I am sorry. SRAM isn’t getting that serial number to appear in their database. Would you be able to double check that number?

Thanks,

Hi,

I have a new XX SL groupset. Is it possible to confirm the Q Factor please.

170 Cranks

19T32941993

FC-XX-SLP-D1

Hi and thanks for the question.

Your crankset is the 174 Q Factor version.

Thanks,

I have a SRAM XX SL crankset on my 2024 Trek Supercaliber 9.9 AXS XX bike. I’m interested in a power meter spider for this crank. Based on the serial number below, what offset should I purchase? Thank you!

43T35189158

FC-XX-SL-D1

Hi and thanks for the question,

Your XX SL crankset is the 174 Q Factor version. The 3 mm offset chainring is applicable for a 55 mm chainline frameset. Please see below:

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,

is my q factor?

fc-xx-sl-d1 22t33234224

Hi and thanks for your question.

Your crankset is the 168 Q Factor. Please see the below chart for chainring offset compatibility:

For 168 mm Q-Factor cranks:

If your bike has a 52 mm chainline, you need a 3 mm offset chainring

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

Thanks,

Hi, my serial number on my XX SL crankset is 17T32711457, FC-XX-SL-D, 170mm crank arm. What’s the Q factor and how do I figure out the chainline? The bike is a 2023 Pivot Mach4 SL.

Thank you!

Hi! I just followed up with you in the email you sent in and we’ll have some nice options for you once I hear back from SRAM regarding your XX SL crankset’s Q Factor.

Thanks,

Hi. Wondering if you could help me work out which version I have please, my serial number is 09T31719068, FC-XX-SLP-D1. Thank you.

Hi and thanks for the question. Your crankset is the 174 mm Q Factor. So the below chart will apply:

For 168 mm Q-Factor cranks:

If your bike has a 52 mm chainline, you need a 3 mm offset chainring

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,

Hi. I struggling to identify the Q-factor on my T-type XX SL powermeter crankset. Nothing comes up on the Sram serial number lookup. Can you help me identify what it is so I can purchase the correct chainring/offset.

FC-XX-SLP-D1

03T30997664

Thank you so much.

Todd

Hi Todd,

Your XX SL crankset is the 174 Q Factor version. Please see the below chart for compatible chainring offset:

For 168 mm Q-Factor cranks:

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,

What is the Q factor on my xx sl crankset?

03730952467

FC-XX-SLP- D1

Hi Andrew and thanks for the question. Your XX SL crankset is 174 Q Factor.

Thanks,

Thanks for the great information. I have not been able to find this amount of detail anywhere else. I have an SRAM XX SL Transmission crankset and would like to know the Q factor. The serial number is 22T33291997, C-XX-SLP-D1. Thank you for your time. The cranks are 165 mm. Matt

Hi Matt and thanks for the question. Your crankset has a 168 Q Factor. Please see the below chart for compatible chainring offset.

For 168 mm Q-Factor cranks:

If your bike has a 55 mm chainline, you need a 0 mm offset chainring

For 174 mm (Wide) Q-Factor cranks:

If your bike has a 52 mm chainline, unfortunately this crankset will not work with your bike and you would need a 168 mm version

If your bike has a 55 mm chainline, you need a 3 mm offset chainring

Thanks,