You could use two of these to sandwich your existing 36t small chainring:https://www.bikeman.com/CR0408.html

...or use two of these https://www.bikeman.com/CR0400.html with a 42t chainring https://www.bikeman.com/CR1160.html

+1
My setup is a 42 tooth chainring, with a pair of chainguards, and an 8 speed cassette. I have 5000 miles on this setup without ever having lost the chain.

If IGH's count, then yes. 1x8 with Nexus/Alfine and soon to be 1 x infinity within a 360% range (Nuvinci)

+1 1x14 Rohloff, 2 bikes , one sliding dropout, 1 with a chain tensioner,
[bike friday pocket Llama]
has a 'chainminder' on the inside , a toothless disc on the outside, it folds some,

Brompton: a 2 speed internal gear crank and an AW3 hub , so 2 by 3
but still one chainring, one hub cog. It folds best.


for clean trousers SKF offers a nice chainguard , long tails back towards the back.
if a IG, Hebie chainglider encloses the whole drivetrain
Nexus and Rohloff rear portions, / 42t & 38t front portions, a mix and match.

Anything similar to the Salsa Crossing Guards in silver? Polished bare is best.

Also, to mount one on the inside, would I have to get a new bottom bracket to move the parts farther from the chainstays. It doesn't seem like it would fit.

I'm surprised that any chain retention is used with an IGH. Neither of bikes have one, and they operate without issue. I had assumed that the issue was a bad chain line at the extremes of the gear range. With one ring and one cog, I would think it would just be set up with a chain line that wasn't prone to jumping.

Maybe one from K-Edge, they're in Boise Idaho .. [Company started in ski tuning tools]

there are ugly chemicals to remove anodizing , and thus the color,
but then the aluminum corrodes..
the disc + chain catcher like jump stop/dog-fang does the job on the inside

you have to analyze your frame. most triples don't need clearance out to the large diameter of
cyclocross chainguard/chainring sandwiches.


fwiw , on my bike friday the rear fold benefits from a couple pieces, to keep the chain on.
one unique to Bike friday, the chain minder keeps the chain on when
the rear fold has the chain go slack. wheel comes along side of the main triangle.

the Rohloff chain tensioner is there because the hinge,
the fold pivots on, is behind the BB.

I have bounced the chain, off the cog on the hub.
have considered a disc rohloff makes for using the hub on full suspension bikes,
to keep it from coming off on the inside..

What do you mean?

Also, I'm pretty sure the K-Edge system would prevent me from using a chain guard.

K edge makes cyclocross chainguards too. one on the outside ,
you can stick the finger thing on the inside if you wish..

or one of the sort that wrap around the seat tube.

OK then take it to a bike shop and ask them. this is just text.

I felt like that was a bit rude, but, like you said, "this is just text". Text has a tendency to seem rude even if that wasn't the intention.

Regardless, I think I have an good idea what I need to do to keep my chain in place.

My final question concerns bottom bracket spindle lengths. Any Cross Check or other owners install a third chainring (I would install some sort of guard) on the inside? Did you need a new bottom bracket to give enough clearance from the chainstay?

Ah, that makes more sense to me. Thanks.

Yes. a 1x8 drive on my winter road commuter. 42 T up front, 28 x12 T out back. Thumb shifter on the stem.

1x9 or 1x8.

Currently running 36x11-28 9sp with the 28t cog trimmed out for better chainline (so it's really a 36x11-26 8sp). The chain was always dropping shifting out of the 28t, so I got fed up one day and made the derailleur never shift there again!

I have a Spot bash guard on the outside and a 3rd Eye Chain Watcher on the inside. I wouldn't mind getting some chainring spacers to make all 9 gears usable again, and also using two bash guards instead of the chain watcher.

Not necc. so. I run a 1xN using a bar-end friction shifter. I can use pretty much any cassette. Currently have an 8 speed on there, but could use 7 or 9 if I wanted to.