Current Projects chat and miscellany

You have some room to adjust the chainline on the free side to match the disc chainline. Which is probably about a 46mm chainline, so would work with the outer chainring.

I think.

Chainline again.
The outer ring of a road double crankset is usually at about... ~46mm
IIRC a bolt on cog on a rear disc hub creates a chainline of about ~53mm
That is a little much variation. You'd be better off with a MTB specific crankset, but then again, that's probably not what you want?
@mdcc_tester please call bollocks on this if applicable...

Yeah thought so .. can this be a reality with a custom frame: Surly Ultra New Disc 135mm hub (fixed) with 6800 cranks and one of those narrow wide rings?

For a fixed gear disc brake bike. Basically @laner 's talbot but with 6800 cranks.

The free hub part is designed for a 52mm chainline. 46mm is about all the way in.
Disc side chainline is also around 51-52mm so it would be a good idea to have the cranks match that for convenient flip flopping.

If single speed or fixed gear a narrow-wide is really not needed at all.
They're pretty though, so I can see what you're after.

Still, I'd call chainline on that.

Oh yeah, it's 135mm spaced innit so 53mm chainline more likely. So MTB cranks only.

Only reasons to go narrow wide is because of the cranks I want to use

Can this be a reality with a custom frame: Surly Ultra New Disc 135mm hub (fixed) with 6800 cranks and one of those narrow wide rings? For a fixed gear disc brake bike. Basically @laner 's talbot but with 6800 cranks.

asking for a friend

@mdcc_tester please call bollocks on this if applicable...

Your comment looks fairly testicle free. This has come up twice in a couple of weeks, I'm thinking about designing an inverse shim to bring a bolt on sprocket in to a road crank compatible chainline as so many people with road disc bikes are looking for it.

my phil woods 135mm has a disc rotor which is far wider looking than the fixed side, so i doubt it you can have matching chain-line both sides

soz I meant just one side (fixed) other being disc brake rotor, just with 6800 cranks and that wolftooth ring.

What is happening here?

Oh right, my hub uses normal road cranks (sram rival) so i assume the surly would also create a normalish chainline on the fixed side

I'm thinking about designing an inverse shim...

Not sure if serious...
Inner 3D brain thinks that could even be possible for toothcounts of 19+, but the machining costs would be ridiculous...

120mm Track hub with a disc rotor on the fixed side, held with a lockring.
#notsureifgoodidea

and you went Phil because $wag?

Yep, matt actually built my wheel up with a surly new ultra originally as Phil took so long to make mine.
Obviously mines a slightly funky chain line anyway as its two rings front and back.
Just check with surly to confirm their chainline

...

or maybe not!

http://surlybikes.com/info_hole/faqs/what_chainlines_do_your_hubs_provide_and_are_they_all_the_same_hub_shell_sp

y laner :(

looks like matt used #tester_unapproved spacers on mine. (hope rather than sram own)
I haven't currently died because of this

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I did a couple of years ago. Have a cad file somewhere. Figured it wasn't worth it though.
I wanted to use a disc brake when in SS mode so the brake mount would need to be repositioned too. Too many parts and possible faults over getting a chainset with the correct chainline.

ah ha! each side? How do they work exactly? I am a BB spacer noob soz

Looks like he's heavily spaced one side to get the right chainline. On sram @mdcc_tester heavily discourages this, but i don't know if hope BBs are more forgiving of this technique

Yeah looks like