1×9 set up?
"Do you need a front chain device to keep the chain in place?
Guess it depends on what type of riding you intend to do?"
It does depend. On the road your may get away with just shortening the chain accordingly (round both boggest chainring/sprocket + 1 pair of links).
Make sure your chainline is aimed at the middle of the casette
You can use washers to space out the chainring bolts instead of buying short ones
You can use a single ring chainring (eg Thorn unramped, Onone SS etc etc), that are unramped and have deeper teeth to try to stop the chain falling off
You may find the single ring chainring is wide enough (the Thorn one is) to use the original chainring bolts so you don't need washers or short bolts
You can use just a front mech to stop the chain jumping postioned with the low stop in the right place
The Rohloff chainguide is £40-50 I think,
The MRP 1x (above) and ethirteen versions are both about £40
Many people use a bash ring on the outside (CRC have the FSA one for about £16) with something on the inside. Either an N-gear jump stop (above), an inner ring guide (blackspire do one, CRC sell it, fixes to the inner chainring bolt holes), or I use a zefal pump frame mount, fitted to the seattube (as I had one lying about) positioned so that it stops the chain from falling off the chainring. It only really works with a 34.9mm seattube though, anything smaller and the gap is too big (I've no pics I'm afraid)
I also found that with the chain shortened accordingly, a non shadow rear mech would run up against the chainstay and wouldn't shift too well. I've a long cage mech as its what I had and the bike sometimes gets put back to 3×9. With the shortened chain a longer mech is surely tensioning the chain more than a short one as the spring is under more tension, especially in the smaller sprockets?
Start with minimal parts and 'work up' as you encounter problems?Posted 8 years agoadam_hMember
I run a 36t front ring (no pins or ramps) on a normal 3 ring chainset but used the shorter Middleburn chainring bolts. 11-34t rear cassette and a short cage X.0 rear mech. I run the chain fairly short so the rear mech holds a bit of tension in the chain. I had no problems with the chain skipping off, fitted a Paul Comp chain keeper though just to be sure.
Posted 8 years ago
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