alex jb

Guys,

The bamboo frame is built and I love it!
But there is significant work to be done before it's ready to ride and what I have to decide as I am about to epoxy the lugs for cable stops, is the front chain ring(s).

I would like to run 1 x 10 and not bond on the Braden on type mount for front deraliurs.

However the guy who rides CX at my local shop recons he had a hell of a time going 1x9 without running a front mech to just retain the chain.

What say you?

I would consider a BB based bracket and roller but would prefer nothing if chain tension alone will keep it on.
Maybe a single speed type ring with no ramps?

mconlonx

Narrow/wide chainring and a clutch-type rear derailleur.

alex jb

I am in technology deficit!
i heard about the shadow action I Shimano MTB deralliers but i wil go and google this chainring you speak of...

thanks.

FBinNY 

My preferred method for chain retention on a 1x? remains the classic chainring sandwich with a pair of blanks to either side. This is simple, light, reliable, doesn't depend on a frame mount and never fails. It also has the advantage over many other systems in that it also works in reverse, so no danger of dropping a chain if backpedaling through an arc to clear a rock or simply position the pedals in ready position.

dsbrantjr

This Problem Solvers or this Chain Keeper from Paul Component Engineering should work if your bamboo frame will allow it to be mounted correctly.

wphamilton

My simple solution, lightest weight, inexpensive:

alex jb

Thanks guys.
i think the hose clamp version may have to be the first to try because I have access to entry at work and also the seat tube O/D is 40+mm and in my infinite wisdom (not) I think I have built a node near where it needs to go.
where would I get those nifty carbon toothless chainrings from FB?

FBinNY 

Tjhere are a number of sources at all qualities and prices. Look for cyclocross, or CX or for bashguard chainrings.

However, I've never bought one. I scrounge trashed chainrings of a larger size, bandsaw off all the teeth, then file round and smooth with a bevel angle toward the inside, so they're like the side of a pulley.

Dream Cyclery

+1

Forget about bashguard.

alex jb

Shadow+ derallier selected but not yet ordered.
not finding narrow/wide chain rings for 5 stud 110pcd though.
It's getting expensive to simplify...

i hate to do it, but I may have to consider getting the hemp/resin out and putting on a braze on style front derallier mount.

cobba

What type of shifter do you want to use?

alex jb

plan on keeping the 105 road shifters...
is the shadow+ a different cable pull mm/gear?

cobba

Yep

'Shadow+' is 10/11 speed

Shimano's 10 speed 'Mountain' rear derailleurs use a different amount of cable pull to the 10 speed 'Road' rear derailleurs, basically your shifter won't work with it.

Shimano's 9 speed 'Mountain' rear derailleurs will work with your 10 speed 'Road' shifters and there is some 'Shadow' models.

On the following link, click on: 'MTB' > 'Rear Derailleur' > 'SUBMIT'
It'll show a side by side list with the specs of current models.

https://productinfo.shimano.com/specifications.html

fietsbob

Classic std. Cyclocross : 2 disc chainguards on either side of the 1 toothed chainring..
( FB's Sandwich)FSA makes the CF ones, shown.. )

or outside ring , + inside , a chainminder /jump stop*.. on seat tube..

*I use these on all my triple cranks .. inside the granny gear.

alex jb

ah crap.

it was the + not the shadow I was looking for, ie the clutch and tension.
do you happen to know what the cable pull(mm)/shift is on the newer 10/11 shadow+?

does this sound like there is not a way to have a clutched der' and road shifter?

gsa103

What about SRAM? They use the same cable pull for road & mountain so you can mix & match, and even have 1x11 setups now.

SlowJoeCrow

The easiest way to get a clutch derailleur and road shifter is probably SRAM since their 10 speed road and MTB stuff uses the same cable pull and they just released the Force CX1 group which is a dedicated 1x11 group with a road specific clutch type rear mech, wide/narrow chainring and matching left hand lever with no shifter parts.
If you want to stick with Shimano or Campy and keep a clean seat tube the best bet is the old school double chain guard setup Erik Voldengen: Single Chainring Cyclocross. If you want fancy guards FSA does carbon fiber, and BBG Home does lots of anodized colirs and used to do a guard machined to look like an Avid brake rotor.

Little Darwin

Based on what I have read, I personally would switch cranks for the ability to use a narrow/wide chain ring.

Fortunately the bike I am setting up as 1x has a mountain crank.

alex jb

Thanks Slow Joe.
I've not given up on this yet!
I may have to give up on the shadow+ and with it will abandon the thick/thin ring, but the double ring guide seems dooable.

m_b_b

I'm in the midst of planning a 1x10 setup, and there are 110BCD chainrings available from wolf tooth components (Drop-Stop Chainrings). I think Race Face may make them as well.

Little Darwin

I haven't looked at your other thread(s) to see what you intend to do with your bamboo bike.

Unless you are going to be doing off-road riding or cyclocross, I think you are being a bit over-cautious. I personally don't see the need for clutch RD other than mountain biking... even the narrow-wide chain rings may be slight over-kill for the riding I do (pavement and some gravel). Admittedly the cassette for 9 speed is a cm or 2 wider than the old 5 speed freewheels, but I rode a 1x5 "lightweight", sometimes as a mountain bike. This was back before mountain bikes came into being. No retention or special RD. I did end up breaking the frame, but never dropped the chain.

Of course being a bit over-cautious does have its advantages at times.

justin1138

The combination of a wide/narrow chainring with a 9 speed Shadow derailleur will work with your 10 speed 105 shifters. You don't need to give up on this approach.

All that being said, I'm having really good luck with just the wide/narrow chainring and a 105 rear derailleur. And I'm trying really hard to throw the chain too. The Shadow derailleur I purchased may be getting sent back...

alex jb

You are correct Mr Darwin
It does seem a bit overly cautious and I didn't order the shadow+ mech as there seems to be cable pull incompatibility with road shifters.

I had a triple that I took to single with a seat post mounted chain tooth and a CX type guard, but it was 130pcd and my SRAM double I was planning on using is 110pcd.

I have kicking around an old XT mega 9 mech, I also have a 10sp 11-34 XT cassette, that's the back end sorted.
Last night I ordered a single speed chainset, the 44T ring's teeth are likely too wide but it does come with an alloy guard. I have the non ramped shimano 44T ring and a Salsa guard from the triple to single so for the grand sum of £23 for the fixie crank set, I should be ready to go 1 x 10 with front sandwitch.

yote223

This is my 786 Shadow plus GS clutch derailleur with a 785 XT Hollow-TechII crank. I added the Paul chainkeeper and it is flawless.

yote223

This is another option that is highly recommended; Drop-Stop Chainrings