Chainring

[Ramone]

Offsett 6mm or 3mm for Scott Spark 970 2022 Model With Sram NX eagle groupset 1X12

Edited February 13, 2023 by Ramone
Change is words

[TheoG]

It mostly depend on you axle width (end cap to end cap), in your case either std (142mm) or maybe boost (148mm).

What is the offset on your current 32T ring and can you back pedal without the chain coming off in the biggest cog at the back?

If yes, stick to the same offset, if no increase the offset with the 3mm.  alternatively follow these guidelines.

135 & 142 axle spacing - ZERO offset

148 (boost) - 3mm offset

6mm offset is for super boost, I'm pretty sure you don't have that on your Scott.

 

Edited February 13, 2023 by TheoG

[DieselnDust]

1 hour ago, TheoG said:

It mostly depend on you axle width (end cap to end cap), in your case either std (142mm) or maybe boost (148mm).

What is the offset on your current 32T ring and can you back pedal without the chain coming off in the biggest cog at the back?

If yes, stick to the same offset, if no increase the offset with the 3mm.  alternatively follow these guidelines.

135 & 142 axle spacing - ZERO offset

148 (boost) - 3mm offset

6mm offset is for super boost, I'm pretty sure you don't have that on your Scott.

 

You need to swap things around

135QR and 142 Thru axle usually require a 6mm offset chainring for meet chainline of 49mm requirement 

boost drivetrains on 148mm thru axle usually require 3mm offset chain ring to achieve 52mm chainline 

157mm thru axle usually requires zero offset chain ring to achieve 55mm chainline.

cannondale Ai with PF 30 -83mm bb on hollowgram cranks and 148mm rear hub use zero offset chainring to achieve 55mm chainline

with SRAM cranks it uses 3mm offset chainring with 148 hub

If an older 2017-2020 Ai drivetrain with 142TA hun then 6mm offset chainring 

Shimano cranks for 55mm chainline and associated chain ring are required if using the XT M8125 or XTR M9125

 

 

 

 

[TheoG]

4 minutes ago, DieselnDust said:

You need to swap things around

135QR and 142 Thru axle usually require a 6mm offset chainring for meet chainline of 49mm requirement 

boost drivetrains on 148mm thru axle usually require 3mm offset chain ring to achieve 52mm chainline 

157mm thru axle usually requires zero offset chain ring to achieve 55mm chainline.

cannondale Ai with PF 30 -83mm bb on hollowgram cranks and 148mm rear hub use zero offset chainring to achieve 55mm chainline

with SRAM cranks it uses 3mm offset chainring with 148 hub

If an older 2017-2020 Ai drivetrain with 142TA hun then 6mm offset chainring 

Shimano cranks for 55mm chainline and associated chain ring are required if using the XT M8125 or XTR M9125

 

 

 

 

You 100% correct, I had a bit of a brain fart there .... 🙈

[117]

Where would we measure the 49,52 or 55mm chain line? 

[DieselnDust]

16 minutes ago, 117 said:

Where would we measure the 49,52 or 55mm chain line? 

That’s a bit challenging with some bikes but it’s generally from the centreline of the down tube to the centreline of the chainring.  Not all bike as symmetrical in the lower part of the down or seat tubes and in the case of the Cannondale Ai and Pyga Stage/Mobu the drivetrains are offset 6mm and 5mm to the right respectively.

easiest way with most bikes is centre of the bb shell to the centre line of the chainring assuming the bb shell is actually  symmetrical about the centreline of the bike.

Even easier  than that is to simply read the manual

Edited February 13, 2023 by DieselnDust

[117]

Thanks Diesel

Manual? Whats that? 

[DieselnDust]

Just now, 117 said:

Thanks Diesel

Manual? Whats that? 

That the booklet that was at the top of the box and while unpacking the bike you said to youreelf “ don’t need that , save some trees damit!”

Well that what I say but it’s like a boomerang ….. I’m toss it and my wife retrieves stating you’ll need this.< experience has taught me not to make retriever jokes at this time….>

[117]

1 minute ago, DieselnDust said:

Well that what I say but it’s like a boomerang ….. I’m toss it and my wife retrieves stating you’ll need this.< experience has taught me not to make retriever jokes at this time….>

Bwhahahahahaaaa - that made my morning