internal gears and chainline question(s)

[kohlboto]

so, I'm building up a commuter that utilizes a Sturmey Archer S30 S-RF3 rear hub. The rear spacing is 127mm and in my spare parts bin I have a Chris King BB and a Shimano R700 crank on which I would run an inner ring and chain guard where the outer ring would be.
I'm wondering about the chainline. How do I go (or where do I go to find info) about calculating if this set-up will work for a decent/acceptable chainlne?
and, as a side bar question, what would be a good choice for the front chainring and rear cog? I was thinking 42T - 18ish but I really haven't a clue when it comes to the internally geared hub. I'll be riding short commutes (under 10 km) and a few "hills" (aka slight inclines...).
as always the insight is appreciated.
cheers
Jay

[oliver1850]

You don't have the hub yet?

[thwart]

Re: gearing, one option would be to look at how the bike companies spec gearing for these sorts of bikes...

http://www.swobo.com/catalog/product_info_b.php?cPath=2448_2449

http://www.specialized.com/us/en/bc/SBCProduct.jsp?spid=62019&scid=1102&scname=Multi+Use

[kohlboto]

You don't have the hub yet?
i have the hub (no wheel build yet)

[kohlboto]

Re: gearing, one option would be to look at how the bike companies spec gearing for these sorts of bikes...

http://www.swobo.com/catalog/product_info_b.php?cPath=2448_2449

http://www.specialized.com/us/en/bc/SBCProduct.jsp?spid=62019&scid=1102&scname=Multi+Use
good call. that might point me in the right direction.
thanks Tom

[oliver1850]

The hub has a direct gear, one that's 25% under, and one that's 33% over.

I would start with a good average SS gear setup, like a 42/16 or a 44/18. The hub will give you quite a bit extra range compared to a single speed.

If you're hauling stuff you might want to go lower.

[oliver1850]

I measured the chainline of the inner ring on my R700 crank at about 38.6 mm.

If you have a cog for your hub, measure from the end of the axle lock nut to the center of the cog. Easiest way it to put the axle through a hole in a flat plate. You can use a vise if you don't have a plate. Subract that measurement from 63.5 to get your rear chainline.

[oliver1850]

I found the spec on the hub chainline at kozy's site. It says 43.1. That's pretty much directly between the 2 rings on an R700. If your frame is 130mm you could add a 3 mm spacer to the right side before you build your wheel. That would increase your dish, but improve the chainline to the inner ring.

[kohlboto]

I found the spec on the hub chainline at kozy's site. It says 43.1. That's pretty much directly between the 2 rings on an R700. If your frame is 130mm you could add a 3 mm spacer to the right side before you build your wheel. That would increase your dish, but improve the chainline to the inner ring.
holy crap, I love this place. Many thanks for that info. I owe you a pint or two for that effort.

[sg8357]

The hub has a spacer, cog, circlip. The cogs are also available dished,
so you can turn over the cog, move the spacer to under the circlip
instead of the cog. So you can get at least 4 chain lines in the rear
by shuffling the parts.

The middle gear is direct drive, so set the gearing to what you'd
on a single speed. 65-70 something.