Anybody know of a good light weight chain guide as per title for a 1x9 set up ? I've tried two so far and they haven't fitted. One was a DMR from wiggle, about £35.00, it's designed to guide the chain from a granny ring position and the other was a rather expensive MRP mini G which didn't leave enough room for the chain to run freely.
My set up is SLX as shown below, I'm using the 32t middle ring only, in the middle ring position. Chain jumps off once in a while over rough ground which apart from being quite annoying prevents me from giving the bike a good ragging over the fun bits.
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any help would be much appreciated, cheers.
Kev
Try the Rohloff one. They have it at sjs and I'm sure elsewhere. Looks as though it'd do the job.
n gear and bash guard works well. you might have more luck with a ss ring as well.(taller teeth innit)
Keva - I have a very similar set-up and suffer from the same problem (taking my 1x9 Prince Albert to the Peaks was the wrong bike choice - chain off every 5 yards on every downhill!)
Afraid I dont have an answer (yet), so am watching this thread closely.
Topangarider/thomthumb - can you give any websites for your recommendations?
The DMR chaincage will work on this setup but requires a bit of modification (will post pictures of the one i have on my bike if i get chance later)
MRP might be bringing one out
http://www.velonews.com/photo/89277
But in the mean time a Bash ring and a Jumpstop is your best bet.
I use the gamut one....think it's a P20. It's great, except the roller is a bit noisy. It has a loop of plastic that sits above and beside the chain so there's no way it can come off.
I've used just a normal mech too (without the shifter and cables of course) that worked fine.
An unramped ring will definitely help, but if you get a proper device like the gamut I don't think it's a necessity.
this is the n gear. it's designed to stop you dropping the chain from the granny ring but has loads of adjustment. i borrowed mine off a mate and ran it for a week away at new year. didn't lose the chain all week on rocky desents in northumberland. i think ISON are the distributor.
the dmr guide doesn't work on 32T rings as the teeth are not far enough away from the spider to give clearence, i ran one for a week away last may and it wasn't a great success - it also rubbed in 3-4 gears!
The CMR can be made to work with a 32t (as ive been running on my bike for a few months) but you need a bit of dremmel work to get it to fit. So its not an ideal solution.
the DMR ones are rubbish, horrendous in fact. Steel is entirely the wrong material as it flexs and allows the whole thing to bed under pressure, letting the chain come off.
MRP system 3 (or whatever the new equivalent is) is the best I've tried. Not light, but indestructable and never once let the chain slip off, unlike the DMR which was worse than nothing, it lets the chain fall off then wont let it back on again! at least with no guide puting it backs easy!
OOPS, DMR not CMR.
There's one that just looks like an immovable front mech that might be enough, and no draggy rollers.
Forge used to make a ringpull chain guide like this:
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I used to run to keep my 34t ring on, might be hard to find now tho. (ie: impossible) either that or what about the straitline inner guide?
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the DMR ones (speedguide in my case) are far from rubbish, I have used one for years and years, changed the rubber spacers for metal ones and spent a little time setting it up correctly and it is perfect. Runs silently and the chain has NEVER come off in about 5 years of use, including DH races.
A well setup guide, whichever you choose is gonna work, better to spend that little bit of time over extra money IMO.
I second ThomThumb.
I got an NGear Jumpstop and a BBG bashguard from the States. Setup is perfect, cheap (compared to the Downhill set ups) and lightweight (if that is your thing).
http://www.billys.co.uk/english/group.php?prod=chidop
Looks like this:
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Third the Ngear and Bash- works flawlessly.
I have a NGear for sale in the classifieds if your interested- designed for 31mm tubes. Was used on an inbred for a while...
P
thanks guys, loads of good responses... will have a scoot around the 'net when I've a bit more time - Ngear and bash seems popular. defo trying to keep weight down, the bike is a 25lbs rock lobster 853 steel, I'd like to keep it that way ! ta.
Kev
what is your back mech? can you get one with a stronger spring / shorter arm? This would put more tension in the chain.
the DMR was fine for 95% of the time, the MRP was fine 100% of the time, i know which style I'd buy again.
V8_shin_print... rear mech is a med cage XT rapid rise. I've taken a link out the chain to tighten it, and I've found that if I pedal where ever possible it helps keep the tension up... makes me realise what it must be like to be on a fixie... rubbish !