I'm setting up my day one.
Was hoping to run my SRAM gxp chainset.
Chain line looks to be 42mm
At the rear the stock hub is 135. I have a dished surly fixed cog which gives (135/2=67.5mm. 67.5mm-23mm=44.5
Is 2.5mm difference acceptable or should I be switching cranks to get it closer?
This is going to be fixed gear off road.
I reckon it’ll work but be a bit noisy.
Thanks that's what I'd thought. It's a track chaonset, think a road crank would be better as I'd have more options
I guess the cog arrived safe and sound?
Yes! Arrived and fitted thankyou!
I remember I had spacers between my (track) crankset and chainring when I was running a Day One fixed.
Think I bodged some out of large washers but velosolo and the like sell proper ones.
Thanks @M_V !
Not an option unfortunately. My Sram cranks only allow the chainring to be mounted on the inside. I need to push the chainring out further. Can’t adjust the bb so I think I’ll source another Sram chainset to match the levers.
Worth riding and seeing what it’s like, I had chainline out by 2mm on a steel frame and could barely notice - same on aluminium frame and whole bike vibrated like a chainsaw.
Thanks @TM I really appreciate your advice.
If you're running a 3/32 chainring and sprocket, you can use a 3/32 chain designed for use with a derailleur which will be more tolerant of running at an angle.
Can you move some axle spacers about to shift the hub across towards the non drive side?
@cupcakes @Alexnharvey thanks
I think I've found the answer. This is all new to me I've never set up chainline before.
I'm running a 3/32 setup. Surly dished rear cog, surly ring and tester approved wipperman chain.
With the dished surly hub flipped closest to the spokes and a road double chainset with the cajonringnon the outside I should be at around 45mm front and back give or take 0.5mm.
Im not sure how these come set up as stock as without the dished cog, if I wanted to run single speed for example, then the rear chainline would be about 52mm which seems nuts. I guess they use a wide square taper BB but the q factor must be huge. I'd be tempted to cold set the rear down to something with more options in future if I change setup.
Another option is a Shimano hub converted to bolt on sprocket on the disc mount, as sold/promoted by velo solo. Built without dish it gives a chainline which matches a road double outer. With the standard dish for a disc front wheel it gives a chainline of 41 which can be spaced out to match a track crank or a road double inner.
That's a really good shout @cupcakes I'd forgotten about those.
No probs. They're good, it's a setup I ran on the pomp for a while and will have on my upcoming fat tyre fixed.
Second top recommendation is the spa cycles cranks. Seem decent, plenty chainring options available e.g. velosolo, adjustable chainline as they're square taper.
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Congrats to Tao on winning the Giro