My experience agrees with Garth's.

Wait a minute: That can't be right! Garth's experiences are way too far out
and exuberant for me!

Let me rephrase: Garth's experience shifting an older crank with a newer,
narrower chain, matches mine. I use a Ritchy Logic crank, 8 speed,* with an
11 speed chain on a 10 sp cassette (a slightly narrow chain seems to
improve or ease rear shifting) and I've never had any problem with the
chain falling between the rings.

* Now the chainring spacers for the granny come from who-knows-where, so
they may not be 8 speed ones; they may be 9 speed ones, but never 10 speed
ones. Or, they may be 7 speed ones. At any rate, friction shifted, I've
never even had to think about the mismatch; it just works fine. (Also, bike
has 5-speed friction bar end shifters pulling 8 speed rear derailleur over
10 cogs with 11 sp chain: wonderful shifting.)

On Fri, Jul 29, 2022 at 2:39 PM Garth <garth...@gmail.com> wrote:

> ... Your gearing by the photo is 2x10, not 2x8.  So you're stuck with a 10
> speed chain on a crank whose rings "appear" to be too far apart, for 6/7/8
> speed chains. Well, that's not as big a deal as it may seem on paper. In
> practice is where the rubber meets the road. Does it work , or not ? Screw
> "the book" ! With friction shifting, technique is everything. If you're
> just pulling and pushing hard without paying attention, feeling what's
> happening, sometimes certain combos with throw the chain. Even a "proper on
> paper" setup can throw a chain. It's not something I can put into words
> easily other than to say "use finesse" , a light touch. Play with it in a
> work stand if you have one, or do it around home on the road.
>
> I have on my Bombadil a 44t Surly stainless large ring that is really
> meant for 1x gears as it has no bevels on the teeth. They say it "can" work
> with 7/8 speed chains with multiple cogs though, and 9-speed combo will
> take some "wearing" in. Hah hah ! Well I'm using it with a 9-speed chain,
> and at first it was quite sluggish to shift into certain combos, not even
> close to either cross extremes. So it took me a while to get to know how I
> had to shift in and out of it, to sort of let up on pedal pressure and feel
> for the engagement of the chain on the cogs before moving it fully over
> with the shifter. All this happens in the blink of an eye now, but a first
> it was quite a deliberate and seemingly slow motion.
>

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