Chainline help - Light Carbon LCG-071 and Sram Apex axs

[RiegelundGel97]

Hi guys,

I'm planning on building up my first Chinese frame, the LCG-071, with a Sram Apex axs 1x12 WIDE Group. While checking some data, I stumbled over the chainline:

SRAM APEX AXS 1x12 WIDE has a Chainline of 47,5mm

Frame LCG-071 has a chainline for 1by setup: 49mm
LightCarbon website:
"Max Chainring: If use single chainring, max 42T (corresponding chainline=49.7mm ).
If use double chainring, max 54/42T (chainline=43.5mm)， min 46-30T (chainline=47mm)"

is it good that these 2 47,5mm vs 49mm are close together or could it cause problems that they are not the same?

Ty in advance for your help 

[courdacier]

your chainline will be closer to the highest gear by a few mil, so your granny gear might get a bit noisy. if it bothers you too much you can always space the driveside crank arm out a bit and get a chainring w/more offset.

[dsveddy]

Their advice on chainline is pretty unintelligible to me. Having an LCG071 myself on which I run a 43.5mm chainline crankset, I really don't believe that a 54/42T could fit with a 43.5mm chainline. 46-30T just barely fits. Perhaps there's a typo, where:

If use double chainring, max 54/42T (chainline=43.5mm)，min 46-30T (chainline=47mm)

should actually read:

If use double chainring, max 54/42T (chainline=47mm), max 46-30T (chainline=43.5mm)

Similarly, I don't understand why they would recommend a max chainring of 42T for a 49.7mm chainline, which is a wider chainline than the 43.5mm chainline's outer ring (which sits at 46mm), or even that from a 47.5mm chainline. It would make more sense if they were recommending a 42T max chainring for a 43.5mm 1x chainline, which is what you get with a inboard-offset 1x chainring commonly used in 1x conversions.

In any case: I'm betting that with a 47.5mm chainline, you can run 54/42t max.

[RiegelundGel97]

Their advice on chainline is pretty unintelligible to me. Having an LCG071 myself on which I run a 43.5mm chainline crankset, I really don't believe that a 54/42T could fit with a 43.5mm chainline. 46-30T just barely fits. Perhaps there's a typo, where:

should actually read:

Similarly, I don't understand why they would recommend a max chainring of 42T for a 49.7mm chainline, which is a wider chainline than the 43.5mm chainline's outer ring (which sits at 46mm), or even that from a 47.5mm chainline. It would make more sense if they were recommending a 42T max chainring for a 43.5mm 1x chainline, which is what you get with a inboard-offset 1x chainring commonly used in 1x conversions.

TY very much for your answer! helps a lot!

im indecisive which groupset to use.
In any case: I'm betting that with a 47.5mm chainline, you can run 54/42t max.

[dsveddy]

TY very much for your answer! helps a lot!

im indecisive which groupset to use.
In any case: I'm betting that with a 47.5mm chainline, you can run 54/42t max.

What terrain do you plan on riding?

Sram Apex AXS 1x wide is a safe bet if you want 1x, low cost, and gearing that will cover pretty much any situation on-road and off-road as long as you aren't an elite racer or climbing long 30%+ grades off-road. My only reservation is with the dub spindle in the BB86 shell